A potentially lethal cardiac arrhythmia that is characterized by uncoordinated extremely rapid firing of electrical impulses (400-600/min) in HEART VENTRICLES. Such asynchronous ventricular quivering or fibrillation prevents any effective cardiac output and results in unconsciousness (SYNCOPE). It is one of the major electrocardiographic patterns seen with CARDIAC ARREST.
Abnormal cardiac rhythm that is characterized by rapid, uncoordinated firing of electrical impulses in the upper chambers of the heart (HEART ATRIA). In such case, blood cannot be effectively pumped into the lower chambers of the heart (HEART VENTRICLES). It is caused by abnormal impulse generation.
An electrical current applied to the HEART to terminate a disturbance of its rhythm, ARRHYTHMIAS, CARDIAC. (Stedman, 25th ed)
Cessation of heart beat or MYOCARDIAL CONTRACTION. If it is treated within a few minutes, heart arrest can be reversed in most cases to normal cardiac rhythm and effective circulation.
Recording of the moment-to-moment electromotive forces of the HEART as projected onto various sites on the body's surface, delineated as a scalar function of time. The recording is monitored by a tracing on slow moving chart paper or by observing it on a cardioscope, which is a CATHODE RAY TUBE DISPLAY.
Agents used for the treatment or prevention of cardiac arrhythmias. They may affect the polarization-repolarization phase of the action potential, its excitability or refractoriness, or impulse conduction or membrane responsiveness within cardiac fibers. Anti-arrhythmia agents are often classed into four main groups according to their mechanism of action: sodium channel blockade, beta-adrenergic blockade, repolarization prolongation, or calcium channel blockade.
The artificial substitution of heart and lung action as indicated for HEART ARREST resulting from electric shock, DROWNING, respiratory arrest, or other causes. The two major components of cardiopulmonary resuscitation are artificial ventilation (RESPIRATION, ARTIFICIAL) and closed-chest CARDIAC MASSAGE.
Any disturbances of the normal rhythmic beating of the heart or MYOCARDIAL CONTRACTION. Cardiac arrhythmias can be classified by the abnormalities in HEART RATE, disorders of electrical impulse generation, or impulse conduction.
An abnormally rapid ventricular rhythm usually in excess of 150 beats per minute. It is generated within the ventricle below the BUNDLE OF HIS, either as autonomic impulse formation or reentrant impulse conduction. Depending on the etiology, onset of ventricular tachycardia can be paroxysmal (sudden) or nonparoxysmal, its wide QRS complexes can be uniform or polymorphic, and the ventricular beating may be independent of the atrial beating (AV dissociation).
Cardiac electrical stimulators that apply brief high-voltage electroshocks to the HEART. These stimulators are used to restore normal rhythm and contractile function in hearts of patients who are experiencing VENTRICULAR FIBRILLATION or ventricular tachycardia (TACHYCARDIA, VENTRICULAR) that is not accompanied by a palpable PULSE. Some defibrillators may also be used to correct certain noncritical dysrhythmias (called synchronized defibrillation or CARDIOVERSION), using relatively low-level discharges synchronized to the patient's ECG waveform. (UMDNS, 2003)
An impulse-conducting system composed of modified cardiac muscle, having the power of spontaneous rhythmicity and conduction more highly developed than the rest of the heart.
Implantable devices which continuously monitor the electrical activity of the heart and automatically detect and terminate ventricular tachycardia (TACHYCARDIA, VENTRICULAR) and VENTRICULAR FIBRILLATION. They consist of an impulse generator, batteries, and electrodes.
Methods to induce and measure electrical activities at specific sites in the heart to diagnose and treat problems with the heart's electrical system.
Regulation of the rate of contraction of the heart muscles by an artificial pacemaker.
Removal of tissue with electrical current delivered via electrodes positioned at the distal end of a catheter. Energy sources are commonly direct current (DC-shock) or alternating current at radiofrequencies (usually 750 kHz). The technique is used most often to ablate the AV junction and/or accessory pathways in order to interrupt AV conduction and produce AV block in the treatment of various tachyarrhythmias.
An antianginal and class III antiarrhythmic drug. It increases the duration of ventricular and atrial muscle action by inhibiting POTASSIUM CHANNELS and VOLTAGE-GATED SODIUM CHANNELS. There is a resulting decrease in heart rate and in vascular resistance.
Unexpected rapid natural death due to cardiovascular collapse within one hour of initial symptoms. It is usually caused by the worsening of existing heart diseases. The sudden onset of symptoms, such as CHEST PAIN and CARDIAC ARRHYTHMIAS, particularly VENTRICULAR TACHYCARDIA, can lead to the loss of consciousness and cardiac arrest followed by biological death. (from Braunwald's Heart Disease: A Textbook of Cardiovascular Medicine, 7th ed., 2005)
Recording of regional electrophysiological information by analysis of surface potentials to give a complete picture of the effects of the currents from the heart on the body surface. It has been applied to the diagnosis of old inferior myocardial infarction, localization of the bypass pathway in Wolff-Parkinson-White syndrome, recognition of ventricular hypertrophy, estimation of the size of a myocardial infarct, and the effects of different interventions designed to reduce infarct size. The limiting factor at present is the complexity of the recording and analysis, which requires 100 or more electrodes, sophisticated instrumentation, and dedicated personnel. (Braunwald, Heart Disease, 4th ed)
An autosomal dominant defect of cardiac conduction that is characterized by an abnormal ST-segment in leads V1-V3 on the ELECTROCARDIOGRAM resembling a right BUNDLE-BRANCH BLOCK; high risk of VENTRICULAR TACHYCARDIA; or VENTRICULAR FIBRILLATION; SYNCOPAL EPISODE; and possible sudden death. This syndrome is linked to mutations of gene encoding the cardiac SODIUM CHANNEL alpha subunit.
A group of cardiac arrhythmias in which the cardiac contractions are not initiated at the SINOATRIAL NODE. They include both atrial and ventricular premature beats, and are also known as extra or ectopic heartbeats. Their frequency is increased in heart diseases.
The chambers of the heart, to which the BLOOD returns from the circulation.
The domestic dog, Canis familiaris, comprising about 400 breeds, of the carnivore family CANIDAE. They are worldwide in distribution and live in association with people. (Walker's Mammals of the World, 5th ed, p1065)
The restoration to life or consciousness of one apparently dead. (Dorland, 27th ed)
The period of time following the triggering of an ACTION POTENTIAL when the CELL MEMBRANE has changed to an unexcitable state and is gradually restored to the resting (excitable) state. During the absolute refractory period no other stimulus can trigger a response. This is followed by the relative refractory period during which the cell gradually becomes more excitable and the stronger impulse that is required to illicit a response gradually lessens to that required during the resting state.
Abnormally rapid heartbeat, usually with a HEART RATE above 100 beats per minute for adults. Tachycardia accompanied by disturbance in the cardiac depolarization (cardiac arrhythmia) is called tachyarrhythmia.
The veins that return the oxygenated blood from the lungs to the left atrium of the heart.
Rhythmic compression of the heart by pressure applied manually over the sternum (closed heart massage) or directly to the heart through an opening in the chest wall (open heart massage). It is done to reinstate and maintain circulation. (Dorland, 28th ed)
Elements of limited time intervals, contributing to particular results or situations.
A conical fibro-serous sac surrounding the HEART and the roots of the great vessels (AORTA; VENAE CAVAE; PULMONARY ARTERY). Pericardium consists of two sacs: the outer fibrous pericardium and the inner serous pericardium. The latter consists of an outer parietal layer facing the fibrous pericardium, and an inner visceral layer (epicardium) resting next to the heart, and a pericardial cavity between these two layers.
The number of times the HEART VENTRICLES contract per unit of time, usually per minute.
The lower right and left chambers of the heart. The right ventricle pumps venous BLOOD into the LUNGS and the left ventricle pumps oxygenated blood into the systemic arterial circulation.
A class Ia antiarrhythmic drug that is structurally-related to PROCAINE.
The innermost layer of the heart, comprised of endothelial cells.
Any of various animals that constitute the family Suidae and comprise stout-bodied, short-legged omnivorous mammals with thick skin, usually covered with coarse bristles, a rather long mobile snout, and small tail. Included are the genera Babyrousa, Phacochoerus (wart hogs), and Sus, the latter containing the domestic pig (see SUS SCROFA).
The hollow, muscular organ that maintains the circulation of the blood.
Evaluation undertaken to assess the results or consequences of management and procedures used in combating disease in order to determine the efficacy, effectiveness, safety, and practicability of these interventions in individual cases or series.
A potent anti-arrhythmia agent, effective in a wide range of ventricular and atrial ARRHYTHMIAS and TACHYCARDIAS.
Occurrence of heart arrest in an individual when there is no immediate access to medical personnel or equipment.
A disorder of cardiac function caused by insufficient blood flow to the muscle tissue of the heart. The decreased blood flow may be due to narrowing of the coronary arteries (CORONARY ARTERY DISEASE), to obstruction by a thrombus (CORONARY THROMBOSIS), or less commonly, to diffuse narrowing of arterioles and other small vessels within the heart. Severe interruption of the blood supply to the myocardial tissue may result in necrosis of cardiac muscle (MYOCARDIAL INFARCTION).
Abrupt changes in the membrane potential that sweep along the CELL MEMBRANE of excitable cells in response to excitation stimuli.
The abrupt cessation of all vital bodily functions, manifested by the permanent loss of total cerebral, respiratory, and cardiovascular functions.
Rapid, irregular atrial contractions caused by a block of electrical impulse conduction in the right atrium and a reentrant wave front traveling up the inter-atrial septum and down the right atrial free wall or vice versa. Unlike ATRIAL FIBRILLATION which is caused by abnormal impulse generation, typical atrial flutter is caused by abnormal impulse conduction. As in atrial fibrillation, patients with atrial flutter cannot effectively pump blood into the lower chambers of the heart (HEART VENTRICLES).
Method in which prolonged electrocardiographic recordings are made on a portable tape recorder (Holter-type system) or solid-state device ("real-time" system), while the patient undergoes normal daily activities. It is useful in the diagnosis and management of intermittent cardiac arrhythmias and transient myocardial ischemia.
An anticoagulant that acts by inhibiting the synthesis of vitamin K-dependent coagulation factors. Warfarin is indicated for the prophylaxis and/or treatment of venous thrombosis and its extension, pulmonary embolism, and atrial fibrillation with embolization. It is also used as an adjunct in the prophylaxis of systemic embolism after myocardial infarction. Warfarin is also used as a rodenticide.
Studies in which individuals or populations are followed to assess the outcome of exposures, procedures, or effects of a characteristic, e.g., occurrence of disease.
Theoretical representations that simulate the behavior or activity of the cardiovascular system, processes, or phenomena; includes the use of mathematical equations, computers and other electronic equipment.
NECROSIS of the MYOCARDIUM caused by an obstruction of the blood supply to the heart (CORONARY CIRCULATION).
The return of a sign, symptom, or disease after a remission.
Agents that prevent clotting.
A form of heart block in which the electrical stimulation of HEART VENTRICLES is interrupted at either one of the branches of BUNDLE OF HIS thus preventing the simultaneous depolarization of the two ventricles.
A local anesthetic and cardiac depressant used as an antiarrhythmia agent. Its actions are more intense and its effects more prolonged than those of PROCAINE but its duration of action is shorter than that of BUPIVACAINE or PRILOCAINE.
Recording the locations and measurements of electrical activity in the EPICARDIUM by placing electrodes on the surface of the heart to analyze the patterns of activation and to locate arrhythmogenic sites.
Services specifically designed, staffed, and equipped for the emergency care of patients.
A type of cardiac arrhythmia with premature contractions of the HEART VENTRICLES. It is characterized by the premature QRS complex on ECG that is of abnormal shape and great duration (generally >129 msec). It is the most common form of all cardiac arrhythmias. Premature ventricular complexes have no clinical significance except in concurrence with heart diseases.
An adrenergic beta-antagonist that is used in the treatment of life-threatening arrhythmias.
Optical imaging techniques used for recording patterns of electrical activity in tissues by monitoring transmembrane potentials via FLUORESCENCE imaging with voltage-sensitive fluorescent dyes.
Observation of a population for a sufficient number of persons over a sufficient number of years to generate incidence or mortality rates subsequent to the selection of the study group.
A voltage-gated sodium channel subtype that mediates the sodium ion PERMEABILITY of CARDIOMYOCYTES. Defects in the SCN5A gene, which codes for the alpha subunit of this sodium channel, are associated with a variety of CARDIAC DISEASES that result from loss of sodium channel function.
Ear-shaped appendage of either atrium of the heart. (Dorland, 28th ed)
A transient loss of consciousness and postural tone caused by diminished blood flow to the brain (i.e., BRAIN ISCHEMIA). Presyncope refers to the sensation of lightheadedness and loss of strength that precedes a syncopal event or accompanies an incomplete syncope. (From Adams et al., Principles of Neurology, 6th ed, pp367-9)
A device designed to stimulate, by electric impulses, contraction of the heart muscles. It may be temporary (external) or permanent (internal or internal-external).
A class I anti-arrhythmic agent (one that interferes directly with the depolarization of the cardiac membrane and thus serves as a membrane-stabilizing agent) with a depressant action on the heart similar to that of guanidine. It also possesses some anticholinergic and local anesthetic properties.
Abnormally low BODY TEMPERATURE that is intentionally induced in warm-blooded animals by artificial means. In humans, mild or moderate hypothermia has been used to reduce tissue damages, particularly after cardiac or spinal cord injuries and during subsequent surgeries.
A form of ventricular pre-excitation characterized by a short PR interval and a long QRS interval with a delta wave. In this syndrome, atrial impulses are abnormally conducted to the HEART VENTRICLES via an ACCESSORY CONDUCTING PATHWAY that is located between the wall of the right or left atria and the ventricles, also known as a BUNDLE OF KENT. The inherited form can be caused by mutation of PRKAG2 gene encoding a gamma-2 regulatory subunit of AMP-activated protein kinase.
Damage to the MYOCARDIUM resulting from MYOCARDIAL REPERFUSION (restoration of blood flow to ischemic areas of the HEART.) Reperfusion takes place when there is spontaneous thrombolysis, THROMBOLYTIC THERAPY, collateral flow from other coronary vascular beds, or reversal of vasospasm.
The study of the generation and behavior of electrical charges in living organisms particularly the nervous system and the effects of electricity on living organisms.
An antiarrhythmia agent that is particularly effective in ventricular arrhythmias. It also has weak beta-blocking activity.
An aspect of personal behavior or lifestyle, environmental exposure, or inborn or inherited characteristic, which, on the basis of epidemiologic evidence, is known to be associated with a health-related condition considered important to prevent.
Analysis based on the mathematical function first formulated by Jean-Baptiste-Joseph Fourier in 1807. The function, known as the Fourier transform, describes the sinusoidal pattern of any fluctuating pattern in the physical world in terms of its amplitude and its phase. It has broad applications in biomedicine, e.g., analysis of the x-ray crystallography data pivotal in identifying the double helical nature of DNA and in analysis of other molecules, including viruses, and the modified back-projection algorithm universally used in computerized tomography imaging, etc. (From Segen, The Dictionary of Modern Medicine, 1992)
Injuries caused by electric currents. The concept excludes electric burns (BURNS, ELECTRIC), but includes accidental electrocution and electric shock.
The muscle tissue of the HEART. It is composed of striated, involuntary muscle cells (MYOCYTES, CARDIAC) connected to form the contractile pump to generate blood flow.
Treatment process involving the injection of fluid into an organ or tissue.
Naturally occurring or experimentally induced animal diseases with pathological processes sufficiently similar to those of human diseases. They are used as study models for human diseases.
A characteristic symptom complex.
Computer-assisted processing of electric, ultrasonic, or electronic signals to interpret function and activity.
Abnormally low potassium concentration in the blood. It may result from potassium loss by renal secretion or by the gastrointestinal route, as by vomiting or diarrhea. It may be manifested clinically by neuromuscular disorders ranging from weakness to paralysis, by electrocardiographic abnormalities (depression of the T wave and elevation of the U wave), by renal disease, and by gastrointestinal disorders. (Dorland, 27th ed)
Modified cardiac muscle fibers composing the terminal portion of the heart conduction system.
A sudden CARDIAC ARRHYTHMIA (e.g., VENTRICULAR FIBRILLATION) caused by a blunt, non-penetrating impact to the precordial region of chest wall. Commotio cordis often results in sudden death without prompt cardiopulmonary defibrillation.
In screening and diagnostic tests, the probability that a person with a positive test is a true positive (i.e., has the disease), is referred to as the predictive value of a positive test; whereas, the predictive value of a negative test is the probability that the person with a negative test does not have the disease. Predictive value is related to the sensitivity and specificity of the test.
The study of the electrical activity and characteristics of the HEART; MYOCARDIUM; and CARDIOMYOCYTES.
Studies used to test etiologic hypotheses in which inferences about an exposure to putative causal factors are derived from data relating to characteristics of persons under study or to events or experiences in their past. The essential feature is that some of the persons under study have the disease or outcome of interest and their characteristics are compared with those of unaffected persons.
An adjunctive treatment for PARTIAL EPILEPSY and refractory DEPRESSION that delivers electrical impulses to the brain via the VAGUS NERVE. A battery implanted under the skin supplies the energy.
A generic expression for any tachycardia that originates above the BUNDLE OF HIS.
Spasm of the large- or medium-sized coronary arteries.
Obstruction of a blood vessel (embolism) by a blood clot (THROMBUS) in the blood stream.
Failure of equipment to perform to standard. The failure may be due to defects or improper use.
Glycosides from plants of the genus DIGITALIS. Some of these are useful as cardiotonic and anti-arrhythmia agents. Included also are semi-synthetic derivatives of the naturally occurring glycosides. The term has sometimes been used more broadly to include all CARDIAC GLYCOSIDES, but here is restricted to those related to Digitalis.
The movement and the forces involved in the movement of the blood through the CARDIOVASCULAR SYSTEM.
Pathological conditions involving the HEART including its structural and functional abnormalities.
Abnormally rapid heartbeats with sudden onset and cessation.
The hemodynamic and electrophysiological action of the HEART ATRIA.
A group of pathological conditions characterized by sudden, non-convulsive loss of neurological function due to BRAIN ISCHEMIA or INTRACRANIAL HEMORRHAGES. Stroke is classified by the type of tissue NECROSIS, such as the anatomic location, vasculature involved, etiology, age of the affected individual, and hemorrhagic vs. non-hemorrhagic nature. (From Adams et al., Principles of Neurology, 6th ed, pp777-810)
A condition caused by dysfunctions related to the SINOATRIAL NODE including impulse generation (CARDIAC SINUS ARREST) and impulse conduction (SINOATRIAL EXIT BLOCK). It is characterized by persistent BRADYCARDIA, chronic ATRIAL FIBRILLATION, and failure to resume sinus rhythm following CARDIOVERSION. This syndrome can be congenital or acquired, particularly after surgical correction for heart defects.
The hemodynamic and electrophysiological action of the LEFT ATRIUM.
The hemodynamic and electrophysiological action of the HEART VENTRICLES.
Electric conductors through which electric currents enter or leave a medium, whether it be an electrolytic solution, solid, molten mass, gas, or vacuum.
Drugs that bind to but do not activate beta-adrenergic receptors thereby blocking the actions of beta-adrenergic agonists. Adrenergic beta-antagonists are used for treatment of hypertension, cardiac arrhythmias, angina pectoris, glaucoma, migraine headaches, and anxiety.
The proportion of survivors in a group, e.g., of patients, studied and followed over a period, or the proportion of persons in a specified group alive at the beginning of a time interval who survive to the end of the interval. It is often studied using life table methods.
An optical isomer of quinine, extracted from the bark of the CHINCHONA tree and similar plant species. This alkaloid dampens the excitability of cardiac and skeletal muscles by blocking sodium and potassium currents across cellular membranes. It prolongs cellular ACTION POTENTIALS, and decreases automaticity. Quinidine also blocks muscarinic and alpha-adrenergic neurotransmission.
The circulation of blood through the CORONARY VESSELS of the HEART.
An imbalance between myocardial functional requirements and the capacity of the CORONARY VESSELS to supply sufficient blood flow. It is a form of MYOCARDIAL ISCHEMIA (insufficient blood supply to the heart muscle) caused by a decreased capacity of the coronary vessels.
A condition that is characterized by episodes of fainting (SYNCOPE) and varying degree of ventricular arrhythmia as indicated by the prolonged QT interval. The inherited forms are caused by mutation of genes encoding cardiac ion channel proteins. The two major forms are ROMANO-WARD SYNDROME and JERVELL-LANGE NIELSEN SYNDROME.
The qualitative or quantitative estimation of the likelihood of adverse effects that may result from exposure to specified health hazards or from the absence of beneficial influences. (Last, Dictionary of Epidemiology, 1988)
A type of cardiac arrhythmia with premature atrial contractions or beats caused by signals originating from ectopic atrial sites. The ectopic signals may or may not conduct to the HEART VENTRICLES. Atrial premature complexes are characterized by premature P waves on ECG which are different in configuration from the P waves generated by the normal pacemaker complex in the SINOATRIAL NODE.
Impaired conduction of cardiac impulse that can occur anywhere along the conduction pathway, such as between the SINOATRIAL NODE and the right atrium (SA block) or between atria and ventricles (AV block). Heart blocks can be classified by the duration, frequency, or completeness of conduction block. Reversibility depends on the degree of structural or functional defects.
Generally, restoration of blood supply to heart tissue which is ischemic due to decrease in normal blood supply. The decrease may result from any source including atherosclerotic obstruction, narrowing of the artery, or surgical clamping. Reperfusion can be induced to treat ischemia. Methods include chemical dissolution of an occluding thrombus, administration of vasodilator drugs, angioplasty, catheterization, and artery bypass graft surgery. However, it is thought that reperfusion can itself further damage the ischemic tissue, causing MYOCARDIAL REPERFUSION INJURY.
The number of new cases of a given disease during a given period in a specified population. It also is used for the rate at which new events occur in a defined population. It is differentiated from PREVALENCE, which refers to all cases, new or old, in the population at a given time.
Ion channels that specifically allow the passage of SODIUM ions. A variety of specific sodium channel subtypes are involved in serving specialized functions such as neuronal signaling, CARDIAC MUSCLE contraction, and KIDNEY function.
An antiarrhythmic agent which exerts a potential- and frequency-dependent block of SODIUM CHANNELS.
A state characterized by loss of feeling or sensation. This depression of nerve function is usually the result of pharmacologic action and is induced to allow performance of surgery or other painful procedures.
A heterogeneous condition in which the heart is unable to pump out sufficient blood to meet the metabolic need of the body. Heart failure can be caused by structural defects, functional abnormalities (VENTRICULAR DYSFUNCTION), or a sudden overload beyond its capacity. Chronic heart failure is more common than acute heart failure which results from sudden insult to cardiac function, such as MYOCARDIAL INFARCTION.
Antiarrhythmic agent pharmacologically similar to LIDOCAINE. It may have some anticonvulsant properties.
A class of drugs that act by inhibition of sodium influx through cell membranes. Blockade of sodium channels slows the rate and amplitude of initial rapid depolarization, reduces cell excitability, and reduces conduction velocity.
A prediction of the probable outcome of a disease based on a individual's condition and the usual course of the disease as seen in similar situations.
The species Oryctolagus cuniculus, in the family Leporidae, order LAGOMORPHA. Rabbits are born in burrows, furless, and with eyes and ears closed. In contrast with HARES, rabbits have 22 chromosome pairs.
Ultrasonic recording of the size, motion, and composition of the heart and surrounding tissues. The standard approach is transthoracic.
Conical muscular projections from the walls of the cardiac ventricles, attached to the cusps of the atrioventricular valves by the chordae tendineae.
A class of statistical procedures for estimating the survival function (function of time, starting with a population 100% well at a given time and providing the percentage of the population still well at later times). The survival analysis is then used for making inferences about the effects of treatments, prognostic factors, exposures, and other covariates on the function.
Cardiac arrhythmias that are characterized by excessively slow HEART RATE, usually below 50 beats per minute in human adults. They can be classified broadly into SINOATRIAL NODE dysfunction and ATRIOVENTRICULAR BLOCK.
Surgery performed on the heart.
Use of electric potential or currents to elicit biological responses.
A calcium channel blocker that is a class IV anti-arrhythmia agent.
An amino acid formed in vivo by the degradation of dihydrouracil and carnosine. Since neuronal uptake and neuronal receptor sensitivity to beta-alanine have been demonstrated, the compound may be a false transmitter replacing GAMMA-AMINOBUTYRIC ACID. A rare genetic disorder, hyper-beta-alaninemia, has been reported.
A vehicle equipped for transporting patients in need of emergency care.
Contractile activity of the MYOCARDIUM.
Methods of creating machines and devices.
PRESSURE of the BLOOD on the ARTERIES and other BLOOD VESSELS.
A constitution or condition of the body which makes the tissues react in special ways to certain extrinsic stimuli and thus tends to make the individual more than usually susceptible to certain diseases.
A specialized field of physics and engineering involved in studying the behavior and properties of light and the technology of analyzing, generating, transmitting, and manipulating ELECTROMAGNETIC RADIATION in the visible, infrared, and ultraviolet range.
OXADIAZOLES bearing an oxygen at the 5-position. They are mesoionic, with delocalized positive and negative charges.
The amount of BLOOD pumped out of the HEART per beat, not to be confused with cardiac output (volume/time). It is calculated as the difference between the end-diastolic volume and the end-systolic volume.
The hemodynamic and electrophysiological action of the left HEART VENTRICLE. Its measurement is an important aspect of the clinical evaluation of patients with heart disease to determine the effects of the disease on cardiac performance.
The active sympathomimetic hormone from the ADRENAL MEDULLA. It stimulates both the alpha- and beta- adrenergic systems, causes systemic VASOCONSTRICTION and gastrointestinal relaxation, stimulates the HEART, and dilates BRONCHI and cerebral vessels. It is used in ASTHMA and CARDIAC FAILURE and to delay absorption of local ANESTHETICS.
The ENTERIC NERVOUS SYSTEM; PARASYMPATHETIC NERVOUS SYSTEM; and SYMPATHETIC NERVOUS SYSTEM taken together. Generally speaking, the autonomic nervous system regulates the internal environment during both peaceful activity and physical or emotional stress. Autonomic activity is controlled and integrated by the CENTRAL NERVOUS SYSTEM, especially the HYPOTHALAMUS and the SOLITARY NUCLEUS, which receive information relayed from VISCERAL AFFERENTS.
A paravertebral sympathetic ganglion formed by the fusion of the inferior cervical and first thoracic ganglia.
A small nodular mass of specialized muscle fibers located in the interatrial septum near the opening of the coronary sinus. It gives rise to the atrioventricular bundle of the conduction system of the heart.
The hospital unit in which patients with acute cardiac disorders receive intensive care.
A group of diseases in which the dominant feature is the involvement of the CARDIAC MUSCLE itself. Cardiomyopathies are classified according to their predominant pathophysiological features (DILATED CARDIOMYOPATHY; HYPERTROPHIC CARDIOMYOPATHY; RESTRICTIVE CARDIOMYOPATHY) or their etiological/pathological factors (CARDIOMYOPATHY, ALCOHOLIC; ENDOCARDIAL FIBROELASTOSIS).
Surgically placed electric conductors through which ELECTRIC STIMULATION is delivered to or electrical activity is recorded from a specific point inside the body.
A malignant form of polymorphic ventricular tachycardia that is characterized by HEART RATE between 200 and 250 beats per minute, and QRS complexes with changing amplitude and twisting of the points. The term also describes the syndrome of tachycardia with prolonged ventricular repolarization, long QT intervals exceeding 500 milliseconds or BRADYCARDIA. Torsades de pointes may be self-limited or may progress to VENTRICULAR FIBRILLATION.
Paramedical personnel trained to provide basic emergency care and life support under the supervision of physicians and/or nurses. These services may be carried out at the site of the emergency, in the ambulance, or in a health care institution.
An ergot alkaloid (ERGOT ALKALOIDS) with uterine and VASCULAR SMOOTH MUSCLE contractile properties.
A process involving chance used in therapeutic trials or other research endeavor for allocating experimental subjects, human or animal, between treatment and control groups, or among treatment groups. It may also apply to experiments on inanimate objects.
System established by the World Health Organization and the International Committee on Thrombosis and Hemostasis for monitoring and reporting blood coagulation tests. Under this system, results are standardized using the International Sensitivity Index for the particular test reagent/instrument combination used.
The veins and arteries of the HEART.
Blocking of a blood vessel by an embolus which can be a blood clot or other undissolved material in the blood stream.
A species of SWINE, in the family Suidae, comprising a number of subspecies including the domestic pig Sus scrofa domestica.
A C19 norditerpenoid alkaloid (DITERPENES) from the root of ACONITUM plants. It activates VOLTAGE-GATED SODIUM CHANNELS. It has been used to induce ARRHYTHMIAS in experimental animals and it has antiinflammatory and antineuralgic properties.
Pathologic processes that affect patients after a surgical procedure. They may or may not be related to the disease for which the surgery was done, and they may or may not be direct results of the surgery.
A long-acting calcium-blocking agent with significant anti-anginal activity. The drug produces significant coronary vasodilation and modest peripheral effects. It has antihypertensive and selective anti-arrhythmia activities and acts as a calmodulin antagonist.
Ultrasonic recording of the size, motion, and composition of the heart and surrounding tissues using a transducer placed in the esophagus.
A condition in which the LEFT VENTRICLE of the heart was functionally impaired. This condition usually leads to HEART FAILURE; MYOCARDIAL INFARCTION; and other cardiovascular complications. Diagnosis is made by measuring the diminished ejection fraction and a depressed level of motility of the left ventricular wall.
Electronic devices that increase the magnitude of a signal's power level or current.
A guanidinium antihypertensive agent that acts by blocking adrenergic transmission. The precise mode of action is not clear.
A synthetic pregnadiene compound with anti-aldosterone activity.
The use of freezing as a special surgical technique to destroy or excise tissue.
Diseases which have one or more of the following characteristics: they are permanent, leave residual disability, are caused by nonreversible pathological alteration, require special training of the patient for rehabilitation, or may be expected to require a long period of supervision, observation, or care. (Dictionary of Health Services Management, 2d ed)
Isopropyl analog of EPINEPHRINE; beta-sympathomimetic that acts on the heart, bronchi, skeletal muscle, alimentary tract, etc. It is used mainly as bronchodilator and heart stimulant.
Impaired impulse conduction from HEART ATRIA to HEART VENTRICLES. AV block can mean delayed or completely blocked impulse conduction.
The electrical properties, characteristics of living organisms, and the processes of organisms or their parts that are involved in generating and responding to electrical charges.
A distribution in which a variable is distributed like the sum of the squares of any given independent random variable, each of which has a normal distribution with mean of zero and variance of one. The chi-square test is a statistical test based on comparison of a test statistic to a chi-square distribution. The oldest of these tests are used to detect whether two or more population distributions differ from one another.
A product of putrefaction. Poisonous.
The smallest difference which can be discriminated between two stimuli or one which is barely above the threshold.
The valve between the left atrium and left ventricle of the heart.
A widely used non-cardioselective beta-adrenergic antagonist. Propranolol has been used for MYOCARDIAL INFARCTION; ARRHYTHMIA; ANGINA PECTORIS; HYPERTENSION; HYPERTHYROIDISM; MIGRAINE; PHEOCHROMOCYTOMA; and ANXIETY but adverse effects instigate replacement by newer drugs.
Situations or conditions requiring immediate intervention to avoid serious adverse results.
A procedure to stop the contraction of MYOCARDIUM during HEART SURGERY. It is usually achieved with the use of chemicals (CARDIOPLEGIC SOLUTIONS) or cold temperature (such as chilled perfusate).
The movement of the BLOOD as it is pumped through the CARDIOVASCULAR SYSTEM.
Age as a constituent element or influence contributing to the production of a result. It may be applicable to the cause or the effect of a circumstance. It is used with human or animal concepts but should be differentiated from AGING, a physiological process, and TIME FACTORS which refers only to the passage of time.
Statistical models which describe the relationship between a qualitative dependent variable (that is, one which can take only certain discrete values, such as the presence or absence of a disease) and an independent variable. A common application is in epidemiology for estimating an individual's risk (probability of a disease) as a function of a given risk factor.
A form of long QT syndrome that is associated with congenital deafness. It is characterized by abnormal cardioelectrophysiology involving the VOLTAGE-GATED POTASSIUM CHANNEL. It results from mutation of KCNQ1 gene (Subtype 1 or JLN1) or the KCNE1 gene (Subtype 2 or JLN2).
Carrier of aroma of butter, vinegar, coffee, and other foods.
The continuous measurement of physiological processes, blood pressure, heart rate, renal output, reflexes, respiration, etc., in a patient or experimental animal; includes pharmacologic monitoring, the measurement of administered drugs or their metabolites in the blood, tissues, or urine.
A common name used for the genus Cavia. The most common species is Cavia porcellus which is the domesticated guinea pig used for pets and biomedical research.
A congenital cardiomyopathy that is characterized by infiltration of adipose and fibrous tissue into the RIGHT VENTRICLE wall and loss of myocardial cells. Primary injuries usually are at the free wall of right ventricular and right atria resulting in ventricular and supraventricular arrhythmias.
Striated muscle cells found in the heart. They are derived from cardiac myoblasts (MYOBLASTS, CARDIAC).
A set of techniques used when variation in several variables has to be studied simultaneously. In statistics, multivariate analysis is interpreted as any analytic method that allows simultaneous study of two or more dependent variables.
Studies to determine the advantages or disadvantages, practicability, or capability of accomplishing a projected plan, study, or project.
Prolonged dysfunction of the myocardium after a brief episode of severe ischemia, with gradual return of contractile activity.
A statistical technique that isolates and assesses the contributions of categorical independent variables to variation in the mean of a continuous dependent variable.
A 43-kDa peptide which is a member of the connexin family of gap junction proteins. Connexin 43 is a product of a gene in the alpha class of connexin genes (the alpha-1 gene). It was first isolated from mammalian heart, but is widespread in the body including the brain.
Abnormally rapid heartbeats originating from one or more automatic foci (nonsinus pacemakers) in the HEART ATRIUM but away from the SINOATRIAL NODE. Unlike the reentry mechanism, automatic tachycardia speeds up and slows down gradually. The episode is characterized by a HEART RATE between 135 to less than 200 beats per minute and lasting 30 seconds or longer.
A form of CARDIAC MUSCLE disease, characterized by left and/or right ventricular hypertrophy (HYPERTROPHY, LEFT VENTRICULAR; HYPERTROPHY, RIGHT VENTRICULAR), frequent asymmetrical involvement of the HEART SEPTUM, and normal or reduced left ventricular volume. Risk factors include HYPERTENSION; AORTIC STENOSIS; and gene MUTATION; (FAMILIAL HYPERTROPHIC CARDIOMYOPATHY).
A cardiotonic glycoside obtained mainly from Digitalis lanata; it consists of three sugars and the aglycone DIGOXIGENIN. Digoxin has positive inotropic and negative chronotropic activity. It is used to control ventricular rate in ATRIAL FIBRILLATION and in the management of congestive heart failure with atrial fibrillation. Its use in congestive heart failure and sinus rhythm is less certain. The margin between toxic and therapeutic doses is small. (From Martindale, The Extra Pharmacopoeia, 30th ed, p666)
Freedom of equipment from actual or potential hazards.
Lower than normal body temperature, especially in warm-blooded animals.
Nerve fibers which project from parasympathetic ganglia to synapses on target organs. Parasympathetic postganglionic fibers use acetylcholine as transmitter. They may also release peptide cotransmitters.
Transmission of the readings of instruments to a remote location by means of wires, radio waves, or other means. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)
The 10th cranial nerve. The vagus is a mixed nerve which contains somatic afferents (from skin in back of the ear and the external auditory meatus), visceral afferents (from the pharynx, larynx, thorax, and abdomen), parasympathetic efferents (to the thorax and abdomen), and efferents to striated muscle (of the larynx and pharynx).
A vital statistic measuring or recording the rate of death from any cause in hospitalized populations.
Irregular HEART RATE caused by abnormal function of the SINOATRIAL NODE. It is characterized by a greater than 10% change between the maximum and the minimum sinus cycle length or 120 milliseconds.
Radiography of the vascular system of the heart muscle after injection of a contrast medium.
Bleeding or escape of blood from a vessel.
AMINO ALCOHOLS containing the propanolamine (NH2CH2CHOHCH2) group and its derivatives.
Studies in which subsets of a defined population are identified. These groups may or may not be exposed to factors hypothesized to influence the probability of the occurrence of a particular disease or other outcome. Cohorts are defined populations which, as a whole, are followed in an attempt to determine distinguishing subgroup characteristics.
The use of sophisticated methods and equipment to treat cardiopulmonary arrest. Advanced Cardiac Life Support (ACLS) includes the use of specialized equipment to maintain the airway, early defibrillation and pharmacological therapy.

Site of myocardial infarction. A determinant of the cardiovascular changes induced in the cat by coronary occlusion. (1/1728)

The influence of site of acute myocardial infarction on heart rate, blood pressure, cardiac output, total peripheral resistance (TPR), cardiac rhythm, and mortality was determined in 58 anesthetized cats by occlusion of either the left anterior descending (LAD), left circumflex or right coronary artery. LAD occlusion resulted in immediate decrease in cardiac output, heart rate, and blood pressure, an increase in TPR, and cardiac rhythm changes including premature ventricular beats, ventricular tachycardia, and occasionally ventricular fibrillation. The decrease in cardiac output and increase in TPR persisted in the cats surviving a ventricular arrhythmia. In contrast, right coronary occlusion resulted in a considerably smaller decrease in cardiac output. TPR did not increase, atrioventricular condition disturbances were common, and sinus bradycardia and hypotension persisted in the cats recovering from an arrhythmia. Left circumflex ligation resulted in cardiovascular changes intermediate between those produced by occlusion of the LAD or the right coronary artery. Mortality was similar in each of the three groups. We studied the coronary artery anatomy in 12 cats. In 10, the blood supply to the sinus node was from the right coronary artery and in 2, from the left circumflex coronary artery. The atrioventricular node artery arose from the right in 9 cats, and from the left circumflex in 3. The right coronary artery was dominant in 9 cats and the left in 3. In conclusion, the site of experimental coronary occlusion in cats is a major determinant of the hemodynamic and cardiac rhythm changes occurring after acute myocardial infarction. The cardiovascular responses evoked by ligation are related in part to the anatomical distribution of the occluded artery.  (+info)

Mechanism linking T-wave alternans to the genesis of cardiac fibrillation. (2/1728)

BACKGROUND: Although T-wave alternans has been closely associated with vulnerability to ventricular arrhythmias, the cellular processes underlying T-wave alternans and their role, if any, in the mechanism of reentry remain unclear. METHODS AND RESULTS: -T-wave alternans on the surface ECG was elicited in 8 Langendorff-perfused guinea pig hearts during fixed-rate pacing while action potentials were recorded simultaneously from 128 epicardial sites with voltage-sensitive dyes. Alternans of the repolarization phase of the action potential was observed above a critical threshold heart rate (HR) (209+/-46 bpm) that was significantly lower (by 57+/-36 bpm) than the HR threshold for alternation of action potential depolarization. The magnitude (range, 2.7 to 47.0 mV) and HR threshold (range, 171 to 272 bpm) of repolarization alternans varied substantially between cells across the epicardial surface. T-wave alternans on the surface ECG was explained primarily by beat-to-beat alternation in the time course of cellular repolarization. Above a critical HR, membrane repolarization alternated with the opposite phase between neighboring cells (ie, discordant alternans), creating large spatial gradients of repolarization. In the presence of discordant alternans, a small acceleration of pacing cycle length produced a characteristic sequence of events: (1) unidirectional block of an impulse propagating against steep gradients of repolarization, (2) reentrant propagation, and (3) the initiation of ventricular fibrillation. CONCLUSIONS: Repolarization alternans at the level of the single cell accounts for T-wave alternans on the surface ECG. Discordant alternans produces spatial gradients of repolarization of sufficient magnitude to cause unidirectional block and reentrant ventricular fibrillation. These data establish a mechanism linking T-wave alternans of the ECG to the pathogenesis of sudden cardiac death.  (+info)

Electrocardiographic measures of ventricular repolarisation dispersion in patients with coronary artery disease susceptible to ventricular fibrillation. (3/1728)

OBJECTIVE: To study electrocardiographic measures of ventricular repolarisation dispersion in patients prone to ventricular fibrillation compared with controls matched for the extent of coronary heart disease and the use of beta blockers. DESIGN: A case-control study. SETTING: Cardiovascular laboratory of a tertiary referral centre. PATIENTS: Fifty patients with documented ventricular fibrillation not associated with acute myocardial infarction, and their controls matched for sex, age, number of diseased coronary vessels, left ventricular ejection fraction, previous myocardial infarction and its location, and the use of beta blockers. MAIN OUTCOME MEASURES: Electrocardiographic measures of QT, JT, and Tend interval dispersions in a 12 lead electrocardiogram. RESULTS: The ventricular fibrillation patients compared to controls showed increased mean (SD) QTapex dispersion (53 (18) ms v 44 (18) ms, respectively; p < 0.01) and mean (SD) Tend dispersion (46 (17) ms v 38 (15) ms, respectively; p < 0.05). CONCLUSIONS: Increased QTapex and Tend dispersions are associated with a susceptibility to ventricular fibrillation even when the extent of the coronary heart disease and use of beta blockers are taken into consideration. However, because of a considerable overlap between the groups, measures of QT dispersion assessed from a 12 lead electrocardiogram do not provide clinically useful information for identification of patients at risk of sudden cardiac death.  (+info)

Differential effects of defibrillation on systemic and cardiac sympathetic activity. (4/1728)

OBJECTIVE: To assess the effect of defibrillation shocks on cardiac and circulating catecholamines. DESIGN: Prospective examination of myocardial catecholamine balance during dc shock by simultaneous determination of arterial and coronary sinus plasma concentrations. Internal countershocks (10-34 J) were applied in 30 patients after initiation of ventricular fibrillation for a routine implantable cardioverter defibrillator test. Another 10 patients were externally cardioverted (50-360 J) for atrial fibrillation. MAIN OUTCOME MEASURES: Transcardiac noradrenaline, adrenaline, and lactate gradients immediately after the shock. RESULTS: After internal shock, arterial noradrenaline increased from a mean (SD) of 263 (128) pg/ml at baseline to 370 (148) pg/ml (p = 0.001), while coronary sinus noradrenaline fell from 448 (292) to 363 (216) pg/ml (p = 0.01), reflecting a shift from cardiac net release to net uptake. After external shock delivery, there was a similar increase in arterial noradrenaline, from 260 (112) to 459 (200) pg/ml (p = 0.03), while coronary sinus noradrenaline remained unchanged. Systemic adrenaline increased 11-fold after external shock (p = 0.01), outlasting the threefold rise following internal shock (p = 0.001). In both groups, a negative transmyocardial adrenaline gradient at baseline decreased further, indicating enhanced myocardial uptake. Cardiac lactate production occurred after ventricular fibrillation and internal shock, but not after external cardioversion, so the neurohumoral changes resulted from the defibrillation process and not from alterations in oxidative metabolism. CONCLUSIONS: A dc shock induces marked systemic sympathoadrenal and sympathoneuronal activation, but attenuates cardiac sympathetic activity. This might promote the transient myocardial depression observed after electrical discharge to the heart.  (+info)

Mechanisms of isoflurane-induced myocardial preconditioning in rabbits. (5/1728)

BACKGROUND: Isoflurane has cardioprotective effects that mimic the ischemic preconditioning phenomenon. Because adenosine triphosphate-sensitive potassium channels and adenosine receptors are implicated in ischemic preconditioning, the authors wanted to determine whether the preconditioning effect of isoflurane is mediated through these pathways. METHODS: Myocardial infarct size was measured in seven groups of propofol-anesthetized rabbits, each subjected to 30 min of anterolateral coronary occlusion followed by 3 h of reperfusion. Groups differed only in the pretreatments given, and controls received no pretreatment. An ischemia-preconditioned group was pretreated with 5 min of coronary occlusion and 15 min of reperfusion. An isoflurane-preconditioned group was pretreated with 15 min end-tidal isoflurane, 1.1%, and then 15 min of washout. An isoflurane-plus-glyburide group was administered 0.33 mg/kg glyburide intravenously before isoflurane pretreatment. An isoflurane plus 8-(p-sulfophenyl)-theophylline (SPT) group received 7.5 mg/kg SPT intravenously before isoflurane. Additional groups were administered identical doses of glyburide or SPT, but they were not pretreated with isoflurane. Infarct size and area at risk were defined by staining. Data were analyzed by analysis of variance or covariance. RESULTS: Infarct size, expressed as a percentage of the area at risk (IS:AR) was 30.2+/-11% (SD) in controls. Ischemic preconditioning and isoflurane preexposure reduced myocardial infarct size significantly, to 8.3+/-5% and 13.4+/-8.2% (P<0.05), respectively. Both glyburide and SPT pretreatment eliminated the preconditioning-like effect of isoflurane (IS:AR = 30.0+/-9.1% and 29.2+/-12.6%, respectively; P = not significant). Neither glyburide nor SPF alone increased infarct size (IS:AR = 33.9+/-7.6% and 31.8+/-12.7%, respectively; P = not significant). CONCLUSIONS: Glyburide and SPT abolished the preconditioning-like effects of isoflurane but did not increase infarct size when administered in the absence of isoflurane. Isoflurane-induced preconditioning and ischemia-induced preconditioning share similar mechanisms, which include activation of adenosine triphosphate-sensitive potassium channels and adenosine receptors.  (+info)

Percutaneous transluminal coronary angioplasty, alone or in combination with urokinase therapy, during acute myocardial infarction. (6/1728)

To investigate the effect of pre-treatment of a thrombus with a low dose of urokinase on establishing patency in a persistent infarct-related artery (IRA) during direct percutaneous coronary angioplasty (PTCA), the frequency of acute restenosis during direct PTCA, alone, or in combination with the intracoronary administration of urokinase, was examined in a consecutive nonrandomized series of patients with acute myocardial infarction (AMI). Two hundred and seventy-two successful PTCA patients (residual stenosis <50%) were divided into 2 groups: 88 patients received pre-treatment with intracoronary urokinase following PTCA (combination group); 184 received only direct PTCA without thrombolytic therapy (PTCA group). In the present study, after achievement of a residual stenosis of less than 50%, IRA was visualized every 15 min to assess the frequency of acute restenosis, which was defined as an acute progression of IRA with more than 75% restenosis after initially successful PTCA. In the patients with a large coronary thrombus, the frequency (times) of acute restenosis was significantly lower in the combination group than in the PTCA group (0.98+/-0.19 vs 2.92+/-0.32, p<0.0001). On the other hand, in the patients with a small coronary thrombus, the frequency of acute restenosis showed no difference in either group. The present study indicates that in patients with AMI, PTCA combined with pre-treatment of a low dose of urokinase is much more effective than PTCA alone, especially for those patients who have a large coronary thrombus.  (+info)

Atrial fibrillation detection and R-wave synchronization by Metrix implantable atrial defibrillator: implications for long-term efficacy and safety. The Metrix Investigators. (7/1728)

BACKGROUND: The long-term efficacy of atrial fibrillation (AF) detection and R-wave synchronization are critical safety requirements for the development of an implantable atrial defibrillator (IAD) for treatment of AF. METHODS AND RESULTS: The long-term efficacy of the Metrix IAD for AF detection and R-wave synchronization was tested in 51 patients. The mean duration of follow-up was 259+/-138 days (72 to 613 days). AF detection tests were performed 2240 times during observed operation with 100% specificity and 92.3% sensitivity for differentiation between sinus rhythm and AF; 2219 episodes and their electrograms stored in the device during AF detection were analyzed. The positive predictive value of the AF detection algorithm was 97.4% (lower 95% confidence limit [CL], 94.5%) in the out-of-hospital setting. A total of 242 435 R waves were analyzed for R-wave synchronization. Of these, 49% were marked for synchronized shock delivery, 82% of sinus rhythm and 36% of AF R waves, respectively. All shock markers were properly synchronized and within the R wave (overall synchronization accuracy, 100%; lower 95% CL, 99.999%). Overall, 3719 shocks have been delivered via the IAD with no instance of unsynchronized shock delivery or any episode of proarrhythmia. The observed proarrhythmic risk was 0%, with an estimated maximum proarrhythmic risk of 0.084% per shock (95% upper CL). CONCLUSIONS: The Metrix IAD can appropriately detect AF with a high specificity and sensitivity and reliably synchronize within a suitable R wave for shock delivery to minimize the risk of ventricular proarrhythmia.  (+info)

Intracoronary flecainide induces ST alternans and reentrant arrhythmia on intact canine heart: A role of 4-aminopyridine-sensitive current. (8/1728)

BACKGROUND: The electrical alternans shown on an ST segment, ST alternans, is known as one of the most important predictors of ventricular fibrillation (VF). It has also been reported that sodium channel inhibition changes action potential configuration, especially on the repolarization phase. Thus, the sodium channel blocker may produce ST alternans and trigger reentrant arrhythmia. METHODS AND RESULTS: A sodium channel blocker (disopyramide, lidocaine, or flecainide) was infused selectively into the left anterior descending coronary artery in anesthetized, open-chest dogs. Sixty unipolar electrograms were simultaneously recorded from the entire cardiac surface of the heart. The amplitude of ST alternans (STa) was determined as the difference in the ST-segment magnitude between 2 consecutive electrograms. We accepted the greatest STa among 60 leads for evaluation. High-dose flecainide (100 microg. kg-1. min-1) increased STa and evoked a spontaneous VF. The STa in high-dose flecainide loading (8.7+/-3.4 mV; mean+/-SEM) was significantly greater than that in disopyramide or lidocaine (0. 9+/-0.4 and 0.8+/-0.2 mV, P<0.05). Treatment of 4-aminopyridine (4-AP) suppressed the increase in STa and the occurrence of VF evoked by flecainide, while E4031 or verapamil did not inhibit those. CONCLUSIONS: Flecainide caused the ST alternans that was closely correlated to the occurrence of VF. Because the ST alternans was suppressed by 4-AP treatment, a 4-AP-sensitive current such as Ito or Isus may play an important role on this phenomenon.  (+info)

Since ventricular fibrillation is the predominate cause of death following experimental coronary occlusion, measurement of the ventricular fibrillation threshold is recommended to assess the value of cardiac revascularization procedures. This determination is quantitative, precise and permits measurement under controlled circumstances. It was dissatisfaction with measurement of mortality rate following coronary occlusion in control and experimental animals (bioassay technic) that led to the adoption of the present more exact method.. Acute ligation of the anterior descending branch of the left coronary artery causes an immediate drop in the fibrillation threshold to one-fifth of normal. This is not changed if one releases the artery and retests the animal with occlusion 5 to 6 months later. Implantation of the internal mammary artery into the myocardium of the left ventricle creates a greater resistance to ventricular fibrillation after coronary occlusion. In animals in which the internal ...
The protocol was started after an equilibration time of 30 min. In the first part of the protocol, the vulnerable window, the upper limit of vulnerability and the defibrillation threshold were determined under baseline conditions. For assessment of the vulnerable window and the upper limit of vulnerability, a modified protocol was used as previously described ([20]). The first shock was delivered at an intermediate shock strength (200 to 280 V) and a shock coupling interval of 200 ms to determine the right border of the vulnerable window. Depending on whether ventricular fibrillation was induced, the shock coupling interval was adjusted (prolonged if ventricular fibrillation was induced or shortened if no ventricular fibrillation occurred). To determine the left border of the vulnerable window, an analog procedure was repeated at the same shock strength but at a shock coupling interval of 150 ms. The step size of changes in shock coupling intervals was 10 ms. Because the width of the vulnerable ...
The ventricular fibrillation threshold (VFT) was measured in 28 patients at the time of cardiac surgery. The VFT was measured with a 100 Hz train of 24 rectangular pulses positioned across the ST segment and T wave. Current was applied to the epicardial surface of either ventricle with a bipolar electrode probe. In six patients, the normal right VFT was 24.3 +/- 5.2 mA, and in 10 patients the normal left VFT was 33.6 +/- mA (p less than 0.05). In 12 patients with greater than or equal to 75% obstruction of the left anterior descending coronary artery, the left VFT was 18.6 +/- 6.9 mA. This value was significantly less than the left VFT in patients without coronary artery disease (p less than 0.001). This study shows that the VFT can be measured in man and that coronary artery disease reduces this parameter. ...
Spectral analysis of the first 40 seconds of ventricular fibrillation confirmed the presence of a large periodic component in fibrillation, with a dominant frequency of 9.9 +/- 0.7 Hz and a narrow bandwidth. To determine whether less energy was required for defibrillation at any particular phase of the ventricular fibrillation cycle, the authors studied the effect of synchronization of the countershock to the peaks and troughs of the ventricular fibrillation waveform in 12 dogs anesthetized with sodium pentobarbitone (35 mg/kg iv). There was no significant difference in threshold-delivered energy or threshold-delivered current between shocks synchronized to the peaks of ventricular fibrillation, shocks synchronized to the troughs of ventricular fibrillation, and unsynchronized shocks.
TY - JOUR. T1 - Effect of ligands of opiate receptors on morphofunctional state of the sympathoadrenal system and electrical stability of the heart in acute cold exposure. AU - Lishmanov, Yu B.. AU - Kondratev, B. Yu. AU - Maslov, L. N.. AU - Naryzhnaya, N. V.. PY - 1997/2. Y1 - 1997/2. N2 - Acute cold exposure (-20°C, 4 h) induces a transient decrease in the ventricular fibrillation threshold without morphological and radionuclide signs of irreversible damage to cardiomyocytes. The agonist of μ-receptors DAGO, which reduces adrenoreactivity of the myocardium, prevents the decrease in the ventricular fibrillation threshold induced by acute cold exposure.. AB - Acute cold exposure (-20°C, 4 h) induces a transient decrease in the ventricular fibrillation threshold without morphological and radionuclide signs of irreversible damage to cardiomyocytes. The agonist of μ-receptors DAGO, which reduces adrenoreactivity of the myocardium, prevents the decrease in the ventricular fibrillation ...
A 3 month old boy, with no known health conditions, suffered a sudden collapse at home. On first EMS arrival, ventricular fibrillation (VF) cardiac arrest was identified and resuscitation following UK national guidelines was initiated. He remained in cardiac arrest for over 25 min, during which he received 10 defibrillation shocks, each effective, but with VF reoccurring within a few seconds of each of the first 9. A return of spontaneous circulation (ROSC) was achieved after the 10th shock. The resuscitation was conducted fully in his home, with the early involvement of Advanced Paramedic Practitioners specialising in critical care (APP- CC). Throughout his resuscitation, there remained a strong focus on delivering quality resuscitation in situ, rather than a load and go approach that would have resulted in very early conveyance to hospital with on-going CPR. The patient was subsequently discharged home and is making an excellent recovery. The arrest was later determined to have been caused by a
Ventricular fibrillation (V-fib or VF) is when the heart quivers instead of pumping due to disorganized electrical activity in the ventricles. It is a type of cardiac arrhythmia. Ventricular fibrillation results in cardiac arrest with loss of consciousness and no pulse. This is followed by death in the absence of treatment. Ventricular fibrillation is found initially in about 10% of people in cardiac arrest. Ventricular fibrillation can occur due to coronary heart disease, valvular heart disease, cardiomyopathy, Brugada syndrome, long QT syndrome, electric shock, or intracranial hemorrhage. Diagnosis is by an electrocardiogram (ECG) showing irregular unformed QRS complexes without any clear P waves. An important differential diagnosis is torsades de pointes. Treatment is with cardiopulmonary resuscitation (CPR) and defibrillation. Biphasic defibrillation may be better than monophasic. The medication epinephrine or amiodarone may be given if initial treatments are not effective. Rates of survival ...
Background: Recent studies have shown a high incidence of early repolarization (J-point elevation) in inferolateral leads in patients with idiopathic ventricular fibrillation (IVF). Brugada syndrome (BS) is also characterized by J-point and ST elevation in right precordial leads and VF. However little is known about similarities and differences between IVF with early repolarization (Early Repolarization Syndrome: ERS) and BS.. Methods: Fourteen patients of ERS and twenty-one patients of BS with documented VF were included into this study. Early repolarization was defined as an elevation of the J-point (QRS-ST junction) of at least 0.1mv from baseline in inferior or lateral leads. All patients experienced VF which was confirmed in electrocardiography (ECG) or monitor ECG and follow up data was collected from implantable cardioverter defibrillator (ICD). To distinguish precisely between ERS and BS, provocative tests with sodium-channel blockers were performed in all ERS and BS patients.. Results: ...
BACKGROUND: Ischemic ventricular fibrillation in experimental models has been shown to progress through a series of stages. Progression of ischemic VF in the in vivo human heart has not been determined. METHODS AND RESULTS: We studied 10 patients undergoing cardiac surgery. Ventricular fibrillation was induced by burst pacing. After 30 seconds, global myocardial ischemia was induced by aortic cross-clamp and maintained for 2.5 minutes, followed by coronary reflow. Epicardial activity was sampled (1 kHz) with a sock that contained 256 unipolar contact electrodes. Dominant frequencies were calculated with a fast Fourier transform with a moving window. The locations of phase singularities and activation wavefronts were identified at 10-ms intervals. Preischemic (perfused) ventricular fibrillation was maintained by a disorganized mix of large and small wavefronts. During global myocardial ischemia, mean dominant frequencies decreased from 6.4 to 4.7 Hz at a rate of -0.011±0.002 Hz s(-1) (P|0.001) and then
TY - JOUR. T1 - Effects of chemical subendocardial ablation on activation rate gradient during ventricular fibrillation. AU - Cha, Yong-Mei. AU - Uchida, T.. AU - Wolf, P. L.. AU - Peters, B. B.. AU - Fishbein, M. C.. AU - Karagueuzian, H. S.. AU - Chen, P. S.. PY - 1995. Y1 - 1995. N2 - The mechanism by which an endocardial-epicardial activation rate gradient develops after 1 or 2 min of sustained ventricular fibrillation is unknown. We recorded from electrodes on the epicardium and from hook electrodes in the endocardium in three open-chest control dogs during prolonged ventricular fibrillation. The same recordings were also made in seven dogs after right ventricular subendocardial ablation with Lugol solution and in three dogs after substitution of air for the cavitary blood. The effects of these interventions, i.e., Lugol ablation (n = 2) and the exposure to air (n = 2), on the subendocardial Purkinje fiber transmembrane action potential properties were also evaluated in vitro using ...
Programmed electrical stimulation was performed in eight normal dogs using a stimulator and endocardiai electrode catheters identical to those used in human studies. The right and left ventricular apex were paced at a drive cycle length of 400 ms and, in some cases, 500 ms, with a pacing sequence of single (S1S2), double (S1S2S3) and triple (S1S2S3S4) premature impulses introduced after eight paced complexes. Pacing sequences were performed using combinations of pulse width (1, 2 and 4 ms) and current strengths of 2, 5 and 10 times diastolic threshold, and in three dogs, 15 times diastolic threshold.. Twenty-two episodes of ventricular fibrillation were initiated in five dogs in 170 pacing sequences using current strengths up to 10 times diastolic threshold, and six episodes of ventricular fibrillation in the two of three remaining dogs tested at 15 times diastolic threshold. Ventricular fibrillation was reproducible on seven of nine occasions. Ventrieular fibrillation was never induced by ...
The heartbeat is controlled by the electrical system of the heart. This system is made up of several parts that tell the muscle of the heart when to contract. The SA node starts the heartbeat, causing the atria, or upper chambers of the heart, to contract. The signal then travels through the AV node, bundle of His, bundle branches, and Purkinje fibers. This causes the ventricles, the lower chambers of the heart, to contract. This flow of electrical signals produces a normal heartbeat. Normal heartbeats can be seen in an Electrocardiogram or ECG. Ventricular fibrillation is a very fast, irregular heartbeat that is caused by abnormal firing of electrical signals in the ventricles of the heart. In ventricular fibrillation, disorganized electrical impulses in the hearts lower chambers cause the heart to stop beating (cardiac arrest). The ventricles quiver uselessly instead of pumping blood. This irregular heartbeat can be seen on an electrocardiogram. Ventricular fibrillation usually causes a loss ...
CT Scan showing Adrenal Mass & Tachycardia & Ventricular Fibrillation Symptom Checker: Possible causes include Hypokalemia. Check the full list of possible causes and conditions now! Talk to our Chatbot to narrow down your search.
We describe a combined experiment-modelling framework to investigate the effects of ischaemia on the organisation of ventricular fibrillation in the human heart. In a series of experimental studies epicardial activity was recorded from 10 patients undergoing routine cardiac surgery. Ventricular fibrillation was induced by burst pacing, and recording continued during 2.5 min of global cardiac ischaemia followed by 30 s of coronary reflow. Modelling used a 2D description of human ventricular tissue. Global cardiac ischaemia was simulated by (i) decreased intracellular ATP concentration and subsequent activation of an ATP sensitive K⁺ current, (ii) elevated extracellular K⁺ concentration, and (iii) acidosis resulting in reduced magnitude of the L-type Ca²⁺ current I(Ca,L). Simulated ischaemia acted to shorten action potential duration, reduce conduction velocity, increase effective refractory period, and flatten restitution. In the model, these effects resulted in slower re-entrant activity that was
Ventricular fibrillation (VF) is said to cause more than 300,000 sudden deaths each year in the US alone. In approximately 5 to 12% of cases, there are no demonstrable cardiac or noncardiac causes to account for the episode, which is therefore classified as idiopathic ventricular fibrillation (IVF). Patients with a distinct form of VF called Brugada syndrome (see {601144}) present with a characteristic electrocardiographic pattern, with right bundle branch block (RBBB) and elevation of ST segment in leads V1 to V3 and may account for 40 to 60% of all IVF cases (review by {3:Chen et al., 1998}). Mutations in the SCN5A gene were identified in patients with Brugada syndrome-1 ({601144 ...
KEY POINTS: Animal studies suggest an anti-fibrillatory action of the vagus nerve on the ventricle, although the exact mechanism is controversial. Using a Langendorff perfused rat heart, we show that the acetylcholine analogue carbamylcholine raises ventricular fibrillation threshold (VFT) and flattens the electrical restitution curve. The anti-fibrillatory action of carbamylcholine was prevented by the nicotinic receptor antagonist mecamylamine, inhibitors of neuronal nitric oxide synthase (nNOS) and soluble guanylyl cyclase (sGC), and can be mimicked by the nitric oxide (NO) donor sodium nitroprusside. Carbamylcholine increased NO metabolite content in the coronary effluent and this was prevented by mecamylamine. The anti-fibrillatory action of both carbamylcholine and sodium nitroprusside was ultimately dependent on muscarinic receptor stimulation as all effects were blocked by atropine. These data demonstrate a protective effect of carbamylcholine on VFT that depends upon both muscarinic and
BACKGROUND: The mechanisms that sustain ventricular fibrillation (VF) in the human heart remain unclear. Experimental models have demonstrated either a periodic source (mother rotor) or multiple wavelets as the mechanism underlying VF. The aim of this study was to map electrical activity from the entire ventricular epicardium of human hearts to establish the relative roles of these mechanisms in sustaining early human VF. METHODS AND RESULTS: In 10 patients undergoing cardiac surgery, VF was induced by burst pacing, and 20 to 40 seconds of epicardial activity was sampled (1 kHz) with a sock containing 256 unipolar contact electrodes connected to a UnEmap system. Signals were interpolated from the electrode sites to a fine regular grid (100x100 points), and dominant frequencies (DFs) were calculated with a fast Fourier transform with a moving 4096-ms window (10-ms increments). Epicardial phase was calculated at each grid point with the Hilbert transform, and phase singularities and activation wavefronts
Other complications include aspiration pneumonia and lung damage that may occur after the due rib fractures as a result of resuscitation.. During cardiac arrest, ventricular fibrillation, ie, almost always develops myocardial ischemia, which can postresuscitation to complications such as arrhythmia, myocardial infarction, or a failure in the electro-mechanical work of the heart.. often in patients after ventricular fibrillation and neurological complications observed.For example, anoxic encephalopathy, which is a consequence of hypoxia of the brain during the attack of the disease, can be manifested convulsions and coma.Severe brain damage during a successful coronary care are quite rare.This is due primarily to the fact that in the absence of successful and positive events Cardiac Intensive patients heart does not start.. Treatment treatment, as mentioned above, is made up of successful resuscitation of the patient.The rest of the therapeutic action of medical personnel aimed at preventing the ...
We decided to attempt high energy defibrillation. The use of a second defibrillator with separate pairs of electrodes allows 400 J of biphasic energy to be applied to depolarize a critical amount of myocardium. First described by in animal models by Geddes (4) in 1976, and then by Hoch (1) in 1994. He found that patients who developed refractory ventricular fibrillation during electrophysiology procedures had restoration of regular rhythm.. High energy defibrillation is performed by attaching a second set of pads attached to a second defibrillator, ensuring that a second vector is established through the heart. At the time of defibrillation, both shock buttons are depressed as near-simultaneously as possible.. While the high energy increases the likelihood of successful defibrillation, the severity of postresuscitation myocardial dysfunction increases with the magnitude of electrical energy delivered by the shock (2).. With all of these above efforts including the high energy defibrillation, the ...
TY - JOUR. T1 - Repetitive endocardial focal discharges during ventricular fibrillation with prolonged global ischemia in isolated rabbit hearts. AU - Wu, Tsu Juey. AU - Lin, Shien-Fong. AU - Hsieh, Yu Cheng. AU - Chiu, Yung Tsung. AU - Ting, Chih Tai. PY - 2009/10. Y1 - 2009/10. N2 - Background: Ventricular fibrillation (VF) during prolonged (,5 min) global ischemia (GI) could be due to repetitive endocardial focal discharges (REFDs). This hypothesis was tested in isolated rabbit hearts. Methods and Results: With optical mapping, simultaneous endocardial (left ventricle, LV) and epicardial (both ventricles) activations during VF with prolonged GI were studied (protocol I, 8 hearts). Lugol solution was applied to the LV endocardium in additional 5 hearts after 5-min GI (protocol II). During prolonged GI, sustained VF (,30 s) was successfully induced in 7 protocol I hearts. The dominant frequency of summed optical signals at the LV endocardium was higher than at the epicardium (P,0.05). Mapping ...
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Semantic Scholar extracted view of Primary ventricular fibrillation in acute myocardial infarction: an inherited disease? by Lukas R. C. Dekker et al.
Serious ventricular arrhythmias, a common complication of coronary artery disease, frequently respond to medical management. When pharmacologic and pacemaker therapy fail to control them, however, surgical therapy must be considered. In this review we assess the efficacy of surgical treatment of these arrhythmias. Coronary revascularization fails to reduce the frequency and complexity of ventricular ectopic activity and may exacerbate them. Recurrent ventricular fibrillation due to acute, reversible ischemic events may respond favorably to coronary revascularization. Recurrent ventricular fibrillation associated with recent myocardial infarction when unresponsive to medical therapy can be managed with coronary revascularization and infarctectomy with comparatively good results. Recurrent sustained ventricular tachycardia is not optimally treated with coronary artery bypass grafting and myocardial resection. Operations guided by activation mapping that isolate or destroy the site of origin of the ...
Wavefront synchronization is an important aspect preceding the termination of ventricular fibrillation (VF). We designed a novel approach using multi-electrode pacing that could reduce the energy consumption of successful defibrillation by more than 100-fold. We compared the efficacy of a synchronized pacing algorithm using optical recording-guided pacing at the right ventricle and the posterior left ventricle in isolated rabbit hearts. Two modes of pacing were used in the study. The electrodes were individually controlled (independent mode, ISyncP) or fired together (simultaneous mode, SSyncP) when triggered by tissue polarization at a reference site separate from the pacing sites. The hearts were stained with voltage-sensitive dye and illuminated with laser for epifluorescence imaging during pacing. The number of phase singularities of VF propagation was used to estimate the complexity of VF. A decrease in the number of PS signified a higher degree of VF organization. We found that the pacing ...
The aim of this study was to map electrical activity over the ventricular epicardial surface during ventricular fibrillation (VF) in the human heart, and to document changes associated with ischaemia and reperfusion. In 5 patients undergoing cardiopulmonary bypass VF was induced by burst pacing, and three 30 s episodes of epicardial activity were recorded at 1 kHz using an epicardial sock with 256 unipolar contact electrodes. The first episode of activity was recorded at the start of VF, the second after 2 minutes of ischaemia, and the third during coronary reperfusion. Following 2 minutes of ischaemia the mean dominant frequency (DF) of the epicardial signals fell from 5.6 Hz to 4.5 Hz, and the mean number of epicardial phase singularities increased from 7.8 to 10.5. Following coronary reperfusion the mean DF increased to 6.5 Hz, but there was no significant change in the mean number of epicardial phase singularities.
Systematic review of the basic life support factors for cardiac arrest, including chest compression technique during CPR and rapid defibrillation of shockable rhythms (ventricular tachycardia, ventricular fibrillation), and common underlying causes of cardiac arrest. Includes 4 AMA PRA Category 1 Credits™. Included as part of the 4 credits, this CME activity is eligible for 0.5 Pharmacology CME credits. CME expires on 10/1/2019
The ARREST trial was pivitol to amiodarones incorporation into the ACLS algorithm for refractory pulseless ventricular tachycardia (v-tach) or ventricular fibrillation (v-fib).
My colleagues and I supposed which the existence of this kind of medicine would enhance the possible for cardiac arrhythmias, and we later tested this hypothesis within a individual examine, released inside the Journal with the American College or university of Cardiology . To our surprise, the quantity of latest needed to provide on ventricular fibrillation failed to go down; without a doubt, it increased considerably once the pigs were being administered cocaine. Following some imagined, we understood that our originally puzzling conclusions were not completely away from line, because cocaine has selected anesthetic Qualities that can influence the electrical actions of the center in ways in which secure this content it against shocks and reduce its vulnerability to fibrillation ...
The SK channel was first cloned in 1996 and is known to be responsible for afterhyperpolarization the controls neuronal discharges. It is also known to be present in the atria, but its function in the ventricles was unclear. Studies from the Peng-Sheng Chen Laboratory documented that the SK current is upregulated in failing rabbit ventricles. SK current activation during ventricular fibrillation shortens the APD and is responsible for inducing recurrent VF in failing rabbit ventricles. The lab then performed studies in failing human ventricles to document the presence of SK current upregulation. In the failing ventricles, SK current is important in steepening the action potential duration restitution curve at rapid rates, which help induce VF.. On the other hand, the SK current is also upregulated in failing ventricles during bradycardia and help maintain the repolarization reserve and prevent afterdepolarization and torsades de pointes ventricular arrhythmia. These findings provided new ...
Functional reentry has been hypothesized to be an underlying mechanism of ventricular fibrillation (VF); however, its contribution to activation patterns during fully developed VF is unclear. We applied new quantitative pattern analysis techniques to mapping data acquired from a 21 x 24 unipolar electrode array (2-mm spacing) located on the ventricular epicardium of 7 open-chest, unsupported pigs. Data epochs 4 seconds long beginning 1, 10, 20, 30, and 40 seconds after electrical induction were analyzed. Reentrant circuits were automatically identified and quantified. We found that 2.3% of activation pathways could unambiguously be classified as reentrant. From scaling analysis, an additional 28% of the pathways may also have been reentrant. Reentry was short-lived with 1.5 ± 1.5 (mean ± SD) complete cycles per circuit. The fraction of reentrant pathways, number of cycles per circuit, cycle duration, and area and perimeter of the cores all increased significantly as VF progressed. Core drift ...
Background: To explore the conditions most dangerous for the emergence of sustained Ventricular Tachycardia or Ventricular Fibrillation (VT/VF) a new computational model ..
Ventricular fibrillation is the most severe arrhythmia and the most common cause of sudden cardiac death. See symptoms and treatment at Houston Methodist.
Ventricular fibrillation (VF) is the most common cause of sudden cardiac death (SCD), and accounts for over 300,000 deaths per year in the United States alone....
Ventricular fibrillation (VF) is a life-threatening cardiac arrhythmia in which the coordinated contraction of the ventricular myocardium is replaced by high-frequency, disorganized excitation, resulting in failure of the heart to pump blood. VF is the most commonly identified arrhythmia in cardiac arrest patients.
p,Ischemic preconditioning has been acknowledged as a powerful method of decreasing ischemic injury. However, the antiarrhythmic mechanism of ischemic preconditioning during ischemia is unclear. We studied the effects of ischemic preconditioning on arrhythmias and cardiac electrophysiology during ischemia in Langendorff rat hearts (n = 44). In the non-preconditioned group (PC(-); n = 24), the hearts underwent 5-min zero-flow global ischemia without any prior ischemic preconditioning. In the preconditioned group (PC(+); n = 20), the hearts were preconditioned by three cycles of 3-min zero-flow global ischemia and 5-min reperfusion before undergoing 5-min global ischemia. Ischemic preconditioning reduced the incidence of ischemia-induced arrhythmias (PC(-); 38.9%, PC(+): 8.3%, p , 0.05), shortened monophasic action potential duration (MAPD, P , 0.05), attenuated conduction delay (conduction time; PC(-): 234.2%, PC(+): 173.4%, P , 0.05) and increased the ventricular fibrillation threshold. Although ...
Vincent Galand, Nathalie Behar, Raphael P. Martins. Ventricular fibrillation triggered by a pacemaker-mediated tachycardia protection algorithm. EP-Europace, Oxford University Press (OUP): Policy B, 2017, 19 (8), pp.1342-1342. ⟨10.1093/europace/eux028⟩. ⟨hal-01617573⟩ ...
A best evidence topic in cardiac surgery was written according to a structured protocol. The question addressed was how many cardioversion attempts should be performed for patients who have gone into ventricular fibrillation post-cardiac surgery prio
Learn about ventricular fibrillation, a life-threatening heart rhythm disorder, as well as expert treatments at MedStar Heart & Vascular Institute.
The incidence and temperature of onset of ventricular fibrillation in 132 patients having heart surgery performed using hypothermic cardiopulmonary bypass was determined.
vulnerable period Vulnerable period of heart, a brief time during the cardiac cycle when stimuli are particularly likely to induce repetitive activity like tachycardia, flutter, or fibrillation which persists after the stimulus has ceased; for the ventricle, it occurs during the latter part of systole, during the relative refractory period coincident with the inscription of the latter half of the t wave of the electrocardiogram. ...
ECG: ventricular fibrillation, illustration relating to dogs including description, information, related content and more. MartinM. Canis ISSN: 2398-2942. Related terms: . All information is peer reviewed.
Check our site for the detailed information on the provoking factors and causes of ventricular fibrillation including valvular heart diseases, hypothermia, etc.
Ventricular fibrillation is the abnormal heartbeat in which the heart beats with erratic rhythm. This condition forces the chambers of your heart to pump and
Ventricular fibrillation is an irregular rhythm caused by rapid, uncoordinated fluttering contractions of the hearts lower chambers. It can be fatal.
Increased blood volume and red blood cell mass Increased skeletal muscle capillary density, mitochondrial mass, and oxidative capacity Increased left ventricular mass, end-diastolic dimension, and stroke volume Increased diameter of coronary arteries Decrease in resting heart rate Likely increase in ventricular fibrillation threshold Explain the different cardiovascular responses to volume overload and pressure overload. Exercise […] Read more. ...
Background: This study was done to compare coronary perfusion pressure (CPP) prior to the first rescue shock (RS) among a group of animals that received intraosseous (IO) epinephrine 0.1 mg/ kg (high-dose epinephrine [HDE]) with a group that received intravenous (IV) epinephrine 0.01 mg/kg (standard-dose epinephrine [SDE]) during cardiac arrest resuscitation using a swine model of prolonged out-of-hospital ventricular fibrillation (VF) cardiac arrest. Methods: This was a sec-ondary analysis of prospectively collected data from two IACUC approved protocols. Seventy-nine Yorkshire swine (25 -35 kg) were surgically instrumented under anesthesia and VF was electri-cally induced. After 10 minutes of untreated VF in the IO study (n = 26) and 12 minutes of un-treated VF in the IV study (n = 53), resuscitation commenced with closed chest compressions (CCC). A single dose of epinephrine (HDE IO or SDE IV, respectively) was given and flushed with saline. The CCC and RS attempts were standardized for all animals.
TY - JOUR. T1 - Obstacle-induced transition from ventricular fibrillation to tachycardia in isolated swine right ventricles. T2 - Insights into the transition dynamics and implications for the critical mass. AU - Valderrábano, Miguel. AU - Kim, Young Hoon. AU - Yashima, Masaaki. AU - Wu, Tsu Juey. AU - Karagueuzian, Hrayr S.. AU - Chen, Peng Sheng. N1 - Copyright: Copyright 2007 Elsevier B.V., All rights reserved.. PY - 2000/11/15. Y1 - 2000/11/15. N2 - Objectives: The study was done to test the hypothesis that an artificial anatomical obstacle prevents the maintenance of ventricular fibrillation (VF) by stabilizing reentrant wavefronts (RWF) and increases the critical mass (CM) of myocardium required to sustain VF. Background: Artificial obstacles can anchor RWF in simulated models of VF. Whether an artificial obstacle affects multiple-wavelet VF in real tissue is unclear. Methods: The endocardial surfaces of seven isolated, perfused swine right ventricles were mapped using a plaque of 477 ...
We present a case of a previously healthy 17 year-old white male boy scout who collapsed after a lightning strike, and was found to be in ventricular fibrillation when emergency medical services arrived. The ventricular fibrillation was defibrillated into sinus rhythm after a single direct current (DC) countershock. However, the patient has remained in coma. Commotio cordis, sudden cardiac death from low-energy chest wall impact, is a phenomenon in which an exactly timed and located blow on the chest during the cardiac cycle results in ventricular fibrillation. Commotio cordis and electrical shock can both result in ventricular arrhythmias. We speculate that in this patient, ventricular fibrillation began immediately after the lightning, which probably struck at the peak of the T wave. (Cardiol J 2007; 14: 91-94 ...
Looking for online definition of vulnerable period in the Medical Dictionary? vulnerable period explanation free. What is vulnerable period? Meaning of vulnerable period medical term. What does vulnerable period mean?
The PRCT provides good evidence for the superiority of biphasic defibrillation over monophasic. Analysis of the data from this study gives an NNT of three for successful defibrillation with first shock, and an NNT of four for successful defibrillation within the first three shocks by biphasic compared with monophasic waveforms. These out of hospital studies follow on from extensive in hospital and animal studies showing the superiority of biphasic defibrillation.. All the studies reported used the Heartstream Forerunner defibrillator with non-escalating 150 J shocks. This device uses an impedance compensating biphasic truncated exponential waveform. Laboratory and hospital based studies show the superiority of biphasic waveforms to be broadly applicable and not confined to this specific example of a biphasic waveform. Work is ongoing to refine which parameters of the waveform influence effectiveness. Evidence should be appraised for the effectiveness of the specific waveform used when selecting ...
Stone heart resulting from ischemic contracture of the myocardium, precludes successful resuscitation from ventricular fibrillation (VF). We hypothesized that mild hypothermia might slow the progression to stone heart. Fourteen swine (27 ± 1 kg) were randomized to normothermia (group I; n = 6) or hypothermia groups (group II; n = 8). Mild hypothermia (34 ± 2°C) was induced with ice packs prior to VF induction. The LV and right ventricular (RV) cross-sectional areas were followed by cardiovascular magnetic resonance until the development of stone heart. A commercial 1.5T GE Signa NV-CV/i scanner was used. Complete anatomic coverage of the heart was acquired using a steady-state free precession (SSFP) pulse sequence gated at baseline prior to VF onset. Un-gated SSFP images were obtained serially after VF induction. The ventricular endocardium was manually traced and LV and RV volumes were calculated at each time point. In group I, the LV was dilated compared to baseline at 5 minutes after VF and this
Methods, systems and computer program products for combining atrial defibrillation treatment techniques include techniques for reducing the discomfort associated with defibrillation and/or reducing the defibrillation threshold. Techniques include timing the defibrillation shock to reduce discomfort based on a sensed signal, giving the shock relatively early during atrial fibrillation, therapeutic drugs, administering more than one shock in succession, pacing the heart before, after, or during the defibrillation shock or shocks, and placing the shock electrodes in locations that may reduce discomfort.
Methods, systems and computer program products for combining atrial defibrillation treatment techniques include techniques for reducing the discomfort associated with defibrillation and/or reducing the defibrillation threshold. Techniques include timing the defibrillation shock to reduce discomfort based on a sensed signal, giving the shock relatively early during atrial fibrillation, therapeutic drugs, administering more than one shock in succession, pacing the heart before, after, or during the defibrillation shock or shocks, and placing the shock electrodes in locations that may reduce discomfort.
Refractory ventricular fibrillation (VF), intractable to conventional therapy, can be converted into a stable cardiac rhythm by immediate ventricular volume unloading using a form of mechanical circulatory assist (MCA). We investigated the efficacy o
The incidence of the various types of arrhythmia induced by defibrillation in anesthetized dogs that had had continous ventricular fibrillation for 30 seconds was studied as a function of the current strengh and the duration of the unidirectional rectangular pulse used to terminate the fibrillation. Shocks at 10, 20, 40, 80, and 100 amp with durations in the range of 80 µsec through 64 msec were used. At any given energy level the incidence of induced arrhythmias was much larger for the 40-, 80-, and 100-amp shocks than for the 10- and 20-amp shocks. At 10 and 20 amp, the incidence of induced arrhythmias increased with increasing energy content. Premature ventricular contractions were observed at nearly all levels of energy and current, in contrast to other types of arrhythmias that appear to be strongly related to energy content or current amplitude or both.. ...
Looking for online definition of antifibrillatory in the Medical Dictionary? antifibrillatory explanation free. What is antifibrillatory? Meaning of antifibrillatory medical term. What does antifibrillatory mean?
Publication date: Available online 14 September 2019Source: Nitric OxideAuthor(s): Thomas Uray, Philip E. Empey, Tomas Drabek, Jason P. Stezoski, Keri Janesko-Feldman, Travis Jackson, Robert H. Garman, Francis Kim, Patrick M. Kochanek, Cameron DezfulianAbstractIntroductionBesides therapeutic hypothermia or targeted temperature management no novel therapies have been developed to improve outcomes o...
OBJECTIVES: The PRELUDE (PRogrammed ELectrical stimUlation preDictive valuE) prospective registry was designed to assess the predictive accuracy of sustained ventricular tachycardia/ventricular fibrillation (VTs/VF) inducibility and to identify additional predictors of arrhythmic events in Brugada syndrome patients without history of VT/VF.. BACKGROUND: Brugada syndrome is a genetic disease associated with increased risk of sudden cardiac death. Even though its value has been questioned, inducibility of VTs/VF is widely used to select candidates to receive a prophylactic implantable defibrillator, and its accuracy has never been addressed in prospective studies with homogeneous enrolling criteria.. METHODS: Patients with a spontaneous or drug-induced type I electrocardiogram (ECG) and without history of cardiac arrest were enrolled. The registry included 308 consecutive individuals (247 men, 80%; median age 44 years, range 18 to 72 years). Programmed electrical stimulation was performed at ...
article{bab4e6bd-9055-4d58-83fc-927ad8fea57d, abstract = {,p,Background: Cohort studies have revealed an increased risk for ventricular fibrillation (VF) and sudden cardiac death (SCD) in patients with atrial fibrillation (AF). In this study, we hypothesized that single nucleotide polymorphisms (SNP) previously associated with AF may be associated with the risk of VF caused by first ST-segment elevation myocardial infarction (STEMI). Methods: We investigated association of 24 AF-associated SNPs with VF in the prospectively assembled case-control study among first STEMI-patients of Danish ancestry. Results: We included 257 cases (STEMI with VF) and 537 controls (STEMI without VF). The median age at index infarction was 60 years for the cases and 61 years for the controls (p = 0.100). Compared to the control group, the case group was more likely to be male (86% vs. 75%, p = 0.001), have a history of AF (7% vs. 2%, p = 0.006) or hypercholesterolemia (39% vs. 31%, p = 0.023), and a family history of ...
A method and device for efficient defibrillation, to be utilized in external defibrillation machines, capable of being utilized with 2, 3, or more defibrillation electrodes. The method and device achieve the efficient defibrillation by ensuring that the defibrillation machine energizes the patient with the waveform which is optimum for the number of defibrillation electrodes in use. The method and device accomplishes this by (1) sensing the number of defibrillation electrodes in use, and by (2) selecting the optimum defibrillation waveform for energization of the sensed number of defibrillation electrodes in use.
Our site describes ventricular fibrillation emergency measures, such as cardioversion, cardiopulmonary resuscitation, etc., taken to prevent death
Figure 9. Activation maps for 1 of the capture episodes obtained after lesion induction. The recording obtained with 1 of the electrodes indicates the time corresponding to each of the maps. The color coding indicates local activation times and isochrones. The stimulating electrode is positioned in the central area of the multiple electrode, located on the left ventricular anterior wall.. Discussion The main results of this study are as follows: a) the induction of a lesion in the LV free wall increases the heterogeneity of myocardial activation during VF and modifies the arrival of fronts in adjacent regions; b) stimulation during VF using trains of high-frequency stimuli causes occasional captures during at least 3 consecutive stimuli, and c) lesion elongation slightly increases consecutive captures when using cycles slightly longer than those of the arrhythmia.. Modification of Myocardial Activation During Ventricular Fibrillation Caused by the Lesion Radiofrequency catheter ablation is a ...
TY - JOUR. T1 - Propofol terminates ventricular fibrillation storm caused by pulmonary embolism. AU - Hong, Jiang. AU - Mengdan, Xu. AU - Kong, Ailing. AU - Liu, Qiang. AU - Chen, Rong. AU - Dai, Qiuyan. AU - Wang, Lexin. AU - Sun, Baogui. N1 - Imported on 12 Apr 2017 - DigiTool details were: Journal title (773t) = Chinese Medical Journal. ISSNs: 0366-6999; PY - 2014. Y1 - 2014. M3 - Article. SP - 3840. EP - 3840. JO - Chinas medicine. JF - Chinas medicine. SN - 0366-6999. ER - ...
At 200 joules, the ZOLL RBW delivers more average current to high-impedance patients than any other biphasic waveform-even ones that have higher energy settings.. *The data demonstrate the equivalent efficacy of low-energy rectilinear biphasic shocks compared to standard high-energy monophasic shocks for transthoracic defibrillation for all patients in VT/VF at the 95% confidence level. The data also demonstrate the superior efficacy of low-energy rectilinear biphasic shocks compared to standard high-energy monophasic shocks in patients in VT/VF with high transthoracic impedance at the 90% confidence level.. ...
At 200 joules, the ZOLL RBW delivers more average current to high-impedance patients than any other biphasic waveform-even ones that have higher energy settings.. *The data demonstrate the equivalent efficacy of low-energy rectilinear biphasic shocks compared to standard high-energy monophasic shocks for transthoracic defibrillation for all patients in VT/VF at the 95% confidence level. The data also demonstrate the superior efficacy of low-energy rectilinear biphasic shocks compared to standard high-energy monophasic shocks in patients in VT/VF with high transthoracic impedance at the 90% confidence level.. ...
The risk of ventricular proarrhythmia from atrial defibrillation shocks arises if the current is delivered to a portion of the ventricular myocardium at a time of its vulnerability. The right atrium-coronary sinus lead configuration reduces both the total current delivery and the proportion reaching the ventricles, but it is still likely that a shock delivered during the ventricles vulnerable period could stimulate sufficient myocardium to initiate an arrhythmia. The vulnerable period generally falls within the latter portion of the T wave, corresponding at a cellular level to the relative refractory period of the myocytes, and at a macroscopic level to an interval when the ventricle is inhomogeneously excitable. Generally, shocks that are synchronised to the R wave are incapable of proarrhythmia. However, at short cycle lengths the R wave may begin at a time when part of the ventricular myocardium is still only partially excitable. Thus in extensive sheep experiments ventricular fibrillation ...
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Ventricular Fibrillation is a disorganized electrical excitation of the heart that results in inadequate blood flow to the body. It usually ends in death within a minute. A common way to treat the symptoms of fibrillation is to implant a medical device, known as an Implantable Cardioverter Defibrillator (ICD), in the patients body. Model-based verification can supply rigorous proofs of safety and efficacy. In this paper, we build a hybrid system model of the human heart+ICD closed loop, and show it to be a STORMED system, a class of o-minimal hybrid systems that admit finite bisimulations. In general, it may not be possible to compute the bisimulation. We show that approximate reachability can yield a finite simulation for STORMED systems, and that certain compositions respect the STORMED property. The results of this paper are theoretical and motivate the creation of concrete model checking procedures for STORMED systems.
Cardiopulmonary resuscitation (CPR) is a standardized procedure which includes chest compression and electrical defibrillation. Some aspects, such as the timing of defibrillation, merit further study. The effectiveness of CC in relation to the timing of defibrillation have been a subject of major interest, because it is difficult to determine the priority of CPR interventions (i.e., defibrillation first or CC first). There is also insufficient knowledge about the optimal duration of the CC interval prior to a shock delivery. Experimental studies have shown that it is possible to identify the best condition for successful defibrillation by analysing the ventricular fibrillation waveform during CPR. More specifically, the parameter AMSA (Amplitude Spectrum Area) has been proven to be the most accurate among the various electrocardiographic predictors of defibrillation outcome. The AMSA Trial is now underway; it is a clinical study enrolling cardiac arrest patients rescued by the 118 service in ...
Cardiac electrical alternans, characterized by a beat-to-beat alternation in action potential waveform, is a naturally occurring phenomenon, which can occur at sufficiently fast pacing rates. Its presence has been putatively linked to the onset of cardiac reentry, which is a precursor to ventricular fibrillation. Previous studies have shown that closed-loop alternans control techniques that apply a succession of externally administered cycle perturbations at a single site provide limited Show moreCardiac electrical alternans, characterized by a beat-to-beat alternation in action potential waveform, is a naturally occurring phenomenon, which can occur at sufficiently fast pacing rates. Its presence has been putatively linked to the onset of cardiac reentry, which is a precursor to ventricular fibrillation. Previous studies have shown that closed-loop alternans control techniques that apply a succession of externally administered cycle perturbations at a single site provide limited ...
An implantable system for the defibrillation of the atria of a patients heart includes a pair of atrial defibrillation electrodes configured for delivering a first atrial defibrillation pulse in the heart, and a pulse generator operatively associated with the first pair of atrial defibrillation electrodes for delivering the first atrial defibrillation pulse. The pulse generator delivers a second second atrial defibrillation pulse after the first defibrillation pulse without intervening monitoring thereof to reduce the voltage necessary for the shock, and the pain associated therewith.
A tachyarrhythmia/fibrillation detector in which the Widrow-Hoff LMS algorithm is utilized for estimation of a transfer function. One or more LMS cancellers are placed between two separate sensing electrode pairs placed in or on the heart and by noting the convergence of the error signal or the lack thereof the type of tachyarrhythmia or a ventricular fibrillation condition can be discerned. With sinus rhythm, the error signal is small in power compared to the power of the desired response. With ventricular fibrillation, however the filter weights are unable to converge to cause the filter output signal to track desired signal and the filter output waveform becomes asynchronous with the desired response, yielding a detectably high error power.
A tachyarrhythmia/fibrillation detector in which the Widrow-Hoff LMS algorithm is utilized for estimation of a transfer function. One or more LMS cancellers are placed between two separate sensing electrode pairs placed in or on the heart and by noting the convergence of the error signal or the lack thereof the type of tachyarrhythmia or a ventricular fibrillation condition can be discerned. With sinus rhythm, the error signal is small in power compared to the power of the desired response. With ventricular fibrillation, however the filter weights are unable to converge to cause the filter output signal to track desired signal and the filter output waveform becomes asynchronous with the desired response, yielding a detectably high error power.
The overall results achieved by ambulance service staff in our study compare favourably with other systems in the United Kingdom, Europe, and North America. The overall rate of survival to hospital discharge of 14.9% for patients with witnessed cardiac arrest and a primary rhythm of ventricular fibrillation is higher than the national figure3 4 and is similar to values from other well established programmes.10. We have not shown any improvement in outcome with the presence of a paramedic after cardiac arrest occurring out of hospital. There were small nonsignificant differences between the two groups in the proportion of patients who presented in ventricular fibrillation, whose arrests were witnessed, and who received bystander cardiopulmonary resuscitation. For all of these variables, however, the group treated by paramedics contained a higher proportion of patients who would be expected to have had a better prognosis.. The length of time at the scene of the arrest was significantly longer for ...
Neurologic status at discharge will be assessed using the modified Rankin Score (MRS). A higher value indicates a worse outcome. 0-No symptoms at all; 1-No significant disability despite symptoms; able to carry out all usual duties and activities, 2-Slight disability; unable to carry out all previous activities, but able to look after own affairs without assistance, 3-Moderate disability; requiring some help, but able to walk without assistance; 4-Moderately severe disability; unable to walk without assistance and unable to attend to own bodily needs without assistance, 5-Severe disability; bedridden, incontinent and requiring constant nursing care and attention; 6- ...
Neurologic status at discharge will be assessed using the modified Rankin Score (MRS). A higher value indicates a worse outcome. 0-No symptoms at all; 1-No significant disability despite symptoms; able to carry out all usual duties and activities, 2-Slight disability; unable to carry out all previous activities, but able to look after own affairs without assistance, 3-Moderate disability; requiring some help, but able to walk without assistance; 4-Moderately severe disability; unable to walk without assistance and unable to attend to own bodily needs without assistance, 5-Severe disability; bedridden, incontinent and requiring constant nursing care and attention; 6- ...
ABSTRACT: The goal of this simulation study is to examine, in a sheet of myocardium, the contribution of anode and cathode break phenomena in terminating a spiral wave reentry by the defibrillation shock. The tissue is represented as a homogeneous bidomain with unequal anisotropy ratios. Two case studies are presented in this article: tissue that can electroporate at high levels of transmembrane potential, and model tissue that does not support electroporation. In both cases, the spiral wave is initiated via cross-field stimulation of the bidomain sheet. The extracellular defibrillation shock is delivered via two small electrodes located at opposite tissue boundaries. Modifications in the active membrane kinetics enable the delivery of high-strength defibrillation shocks. Numerical solutions are obtained using an efficient semi-implicit predictor-corrector scheme that allows one to execute the simulations within reasonable time. The simulation results demonstrate that anode and/or cathode break ...
As we know various forms of disturbance of the rhythm of car-diac activity, causing disorders of haemodynamics, can lead to the development of a terminal state including cardiac arrest. In fact, wrote Lang, death as a result of cardiac insufficiency due to a prolonged attack of paroxysmal tachycardia is still not a rare occurrence. The most dangerous forms of arrhythmia, of course, are those leading to an immediate fatal outcome, namely ventricular fibrillation and asystolia. In that connection study of their pathogenesis and search for the most effective therapeutic measures permitting normalization of cardiac rhythm are some of the most important problems of reanimatology in recent years.. The most effective therapeutic measure when paroxysmal tachy-cardia of the ventricles develops has proved, as with ventricular fibrillation, to be that of defibrillation of the heart by means of a condenser discharge.. The possibility of treating certain forms of chronic disorders of cardiac rhythm by ...
Implantable cardioverter defibrillators account for one-third of the decrease in cardiac arrests caused by ventricular fibrillation in North-Holland, according to research in Circulation, an American Heart Association journal.
This shows polymorphic ventricular tachycardia or ventricular fibrillation. There appear to be turning of the points, but torsade de pointes can only be diagnosed in the presence of a long QT on the preceding ECG. Polymorphic v tach may be torsade, but we know this case is not because the previous QTc was 440 ms. Torsade would be due to one set of circumstances (electrolytes, congenital, drugs). More commonly, however this polymorphic v tach is NOT torsade; in fact, ventricular fibrillation looks like this as well. In the case of v fib or non-torsade polymorphic v tach, the most likely etiology is ischemia ...
When you have atrial fibrillation, you might notice a skipped heartbeat, and then feel a thud or thump, followed by your heart racing for an extended amount of time.. Or you might feel heart palpitations or fluttering or jumping of your heart.. Or you might experience sweating or chest pain, mimicking a heart attack... ...
Good question! The answer is obscure, however. The computer is supposed to take the longest of the QT intervals as the final number. I dont know how it evaluates U-waves. If you look in precordial leads, the QT interval is not terribly long. If you look in limb leads, it is impossible to identify a U-wave: are the T- and U-waves merged? Is there no U-wave? Should the QT only be measured in the precordial leads where the T- and U-waves are distinct? I think these are academic questions; in practice, either the U-waves are very prominent, and this signifies probable hypokalemia, or there is a very long QT, which also signals hypokalemia.. ReplyDelete ...
Symptoms of ventricular parasystole - What are the symptoms of ventricular fibrillation? Cardiac arrest. Ventricular fibrillation is a fatal arrhythmia that results in death unless reversed with defibrillation. The main symptoms are cardiovascular collapse with absence of blood pressure, pulselessness, and total unresponsiveness to any stimuli.
"Ventricular fibrillation". Mayo Clinic. Kakita T, Hasegawa K, Morimoto T, Kaburagi S, Wada H, Sasayama S (November 1999). "p300 ... or ventricular fibrillation which is a serious condition where the ventricles of the heart aren't pumping consistently and ...
... could induce ventricular fibrillation in dogs' hearts and more powerful shocks could reverse the fibrillation. This early ... All had ventricular fibrillation; six arrests occurred after the arrival of the MCCU, and four occurred shortly before arrival ... Beck realized that ventricular fibrillation often occurred in hearts that were basically sound and he coined the phrase "Hearts ... Among the first group of patients seen by the MCCU were three patients treated for ventricular fibrillation. One of the three ...
Kassap was diagnosed with ventricular fibrillation. He slowly recovered, but in May 2011 he was forced to withdraw from another ...
... and Ventricular Fibrillation in the EP Lab. What is the Atrial Rhythm? are some of the notable ones. The Government of India ... "Ventricular Fibrillation in the EP Lab. What is the Atrial Rhythm?". Journal of Cardiovascular Electrophysiology. 19 (9): 991- ...
Syncopal Attacks Due to Paroxysmal Ventricular Fibrillation. (Presentation of 1st Case in Italian Pediatric Literature]". La ... It is a relatively common cause of sudden death along with Brugada syndrome and arrhythmogenic right ventricular dysplasia. In ... When symptoms occur, they are generally caused by abnormal heart rhythms (arrhythmias), most commonly a form of ventricular ... November 2015). "2015 ESC Guidelines for the management of patients with ventricular arrhythmias and the prevention of sudden ...
Würzel, 61, British guitarist (Motörhead), ventricular fibrillation. Pierrette Alarie, 89, Canadian soprano, wife of tenor ...
Ventricular fibrillation is a major cause of cardiac arrest, or sudden cardiac death, which accounts for about 10% of mortality ... His investigations have been the basis for development of new markers and therapies for atrial and ventricular fibrillation. ... His investigations have been the basis for development of new markers and therapies for atrial and ventricular fibrillation. ... The same tissue was confirmed to also play a pathogenic role in ventricular fibrillation associated with myocardial infarction ...
Fibrillation can affect the atrium (atrial fibrillation) or the ventricle (ventricular fibrillation): ventricular fibrillation ... Ventricular arrhythmias include ventricular fibrillation and ventricular tachycardia. Arrhythmias are due to problems with the ... It is needed for the chaotic rhythm of ventricular fibrillation and is also used for pulseless ventricular tachycardia. Often, ... tachycardia Ventricular fibrillation Torsades de pointes Arrhythmogenic right ventricular dysplasia Re-entry ventricular ...
Gouaux, JL; Ashman, R (Sep 1947). "Auricular fibrillation with aberration simulating ventricular paroxysmal tachycardia". ... often seen isolated that is typically seen in atrial fibrillation. It is more often misinterpreted as a premature ventricular ... Tamburrini, LR; Fontanelli, A; Primossi, G (Feb 2001). "[Ventricular pre-excitation: electrophysiopathology, criteria for ... Atrial fibrillation Electrocardiogram Kennedy LB, Leefe W, Leslie BR (2004). "The Ashman phenomenon". J la State Med Soc. 156 ( ...
Bertrix L, Timour-Chah Q, Lang J, Lakhal M, Faucon G (May 1986). "Protection against ventricular and atrial fibrillation by ... ventricular tachycardia), or very symptomatic atrial fibrillation or flutter. Due to the risk of serious side effects, the FDA ... such as atrial fibrillation) developed TdP. For patients who had a history of sustained ventricular tachycardia (abnormal ... The incidence of TdP for sustained ventricular tachycardia patients was 0% with an 80 mg daily dose, 0.5% at 160 mg, 1.6% at ...
Ventricular tachycardia and ventricular fibrillation can also be detected. Respiration affects the cardiac cycle by varying the ... As seen in the figure showing premature ventricular contractions (PVCs), the PPG pulse for the cardiac cycle with the PVC ... increasing ventricular preload, but decreasing stroke volume. Conversely during expiration, the heart is compressed, decreasing ...
Ventricular arrhythmias include ventricular fibrillation and ventricular tachycardia. Arrhythmias are due to problems with the ... The initial heart rhythm is most often ventricular fibrillation. The diagnosis is confirmed by finding no pulse. While a ... In Europe and North America, as of 2014, atrial fibrillation affects about 2% to 3% of the population. Atrial fibrillation and ... Pulmonary atresia with a ventricular septal defect: This type of pulmonary atresia happens when a ventricular septal defect ...
In this report, the system successfully and consistently detected and converted episodes of ventricular fibrillation that were ... O'Riordan, Michael (May 18, 2009). "Subcutaneous ICD system detects and terminates induced ventricular fibrillation". The Heart ... Of the 55 patients, 53 had two instances of fibrillation and in 52 these were successfully converted. These findings were ... One of the three patients was successfully treated for seven successive episodes of ventricular tachycardia, a condition known ...
Tachyarrhythmias are associated with ventricular fibrillation and ventricular tachycardia. Bradyarrhythmias are associated with ... Sudden cardiac death is triggered by an electrical accident, which can be treated with ventricular defibrillation. Stroke ... with both atrial and ventricular ectopy. The sudden epileptic death may be a result of the sympathetic activation or autonomic ...
This improved response time directly related to improved survival rates for victims of SCA with ventricular fibrillation or ... of SCAs are caused by ventricular fibrillation (VF). Receiving defibrillation from an automated external defibrillator (AED) is ... pulseless ventricular tachycardia (VF/VT). During this experiment, the survival rate for witnessed victims of SCA with VT/VF ...
13 December 1947). "VENTRICULAR FIBRILLATION OF LONG DURATION ABOLISHED BY ELECTRIC SHOCK". Journal of the American Medical ...
The two shockable rhythms are ventricular fibrillation and pulseless ventricular tachycardia. In children 2 to 4 J/Kg is ... The two "shockable" rhythms are ventricular fibrillation and pulseless ventricular tachycardia while the two "non-shockable" ... Neither lidocaine nor amiodarone, in those who continue in ventricular tachycardia or ventricular fibrillation despite ... Early defibrillation is effective for the management of ventricular fibrillation and pulseless ventricular tachycardia Early ...
... the risk of sudden death due to serious abnormal heart rhythms such as ventricular fibrillation or polymorphic ventricular ... or sudden cardiac death due to serious abnormal heart rhythms such as ventricular fibrillation or polymorphic ventricular ... in those with Brugada syndrome are typically dangerous arrhythmias such as ventricular fibrillation or polymorphic ventricular ... "Ventricular fibrillation without apparent heart disease: description of six cases". American Heart Journal. 118 (6): 1203-9. ...
Garrett and Farelli diagnose cardiac arrest or ventricular fibrillation. Farelli earns Garrett's admiration by improvising a ...
"Ventricular fibrillation induced by carotid sinus massage without preceding bradycardia". EP Europace. 7 (6): 638-640. doi: ... from ventricular tachycardia. Like the valsalva maneuver, it is a treatment for acute SVT. It is less effective than ...
... prevents cocaine-induced ventricular fibrillation". Am. J. Physiol. 265 (5 Pt 2): H1529-35. PMID 8238564.[permanent dead link] ...
Untreated arrhythmias may progress to atrial fibrillation or ventricular fibrillation. Treatment is aimed at normalizing ... Lorcainide also increases the ventricular fibrillation threshold in a dose-dependent fashion. Overall, Lorcainide causes a ... 0.12 seconds). Fast-acting voltage-gated sodium channels (Nav1.5) found in high concentrations in the ventricular myocytes, ... ventricular tachycardiac and Wolff-Parkinson-White syndrome. Lorcainide was developed by Janssen Pharmaceutica (Belgium) in ...
Termination of Ventricular fibrillation in man by externally applied countershock. N Engl J Med 1956; 254: 727-32 Zoll PM, ... to terminate life-threatening ventricular fibrillation in 1956; installation of a Zoll-Belgard- Electrodyne self-contained long ... Resuscitation of the heart in ventricular standstill by external electrical stimulation. N Engl J Med 1952; 249: 768-71 ...
Brugada syndrome can result in ventricular fibrillation and potentially death. It is a major cause of sudden unexpected cardiac ... "Systematic Review for the 2017 AHA/ACC/HRS Guideline for Management of Patients With Ventricular Arrhythmias and the Prevention ...
The cause of death was ventricular fibrillation triggered by cardiomyopathy. Before he died, Würzel was working on new material ...
A subsequent ECG demonstrated atrial fibrillation with a rapid ventricular response. V. crabro venom contains neurotransmitters ... The victim in this case study was given an oral dose of propafenone (150 mg) and his atrial fibrillation resolved. Vespa crabro ... "A rare cause of atrial fibrillation: a European hornet sting". Anatolian Journal of Cardiology. 11 (6): 559-560. doi:10.5152/ ...
He spent many years studying ventricular fibrillation, and was the first person to propose that ventricular fibrillation was ... Fye (1985) Ventricular fibrillation and defibrillation: historical perspectives with emphasis on the contributions of John ... He studied the condition known then as "Herz-delirium" or "ventricular fibrillation", which became of importance to clinicians ... He logically extended his experiments on ventricular fibrillation in lower animals to humans, surmising that this arrythmia was ...
On 9 April 1985, he was struck by a ventricular fibrillation. Over the next 48 hours, he suffered repeated episodes of this ...
With support from collagen, atrial fibrillation never deteriorates to ventricular fibrillation. Collagen is layered in variable ...
This is why atrial fibrillation almost never degrades to ventricular fibrillation. In youth, this collagen structure is free of ... This is why atrial fibrillation almost never degrades to ventricular fibrillation [tone].[citation needed] Structure of the ... which is why atrial fibrillation can never degrade into ventricular fibrillation. Throughout life, the cardiac collagen ... Each ring receives, by its ventricular margin, the attachment of some of the muscular fibers of the ventricles; its opposite ...
Some ICD devices can distinguish between ventricular fibrillation and ventricular tachycardia (VT), and may try to pace the ... and is never effective if the rhythm is ventricular fibrillation. NASPE / BPEG Defibrillator (NBD) code - 1993[28]. I. II. III ... to try to break the tachycardia before it progresses to ventricular fibrillation. This is known as fast-pacing, overdrive ... 30 cm to induce a ventricular beat (the British Journal of Anaesthesia suggests this must be done to raise the ventricular ...
Zoni-Berisso, M; Lercari, F; Carazza, T; Domenicucci, S (2014). "Epidemiology of atrial fibrillation: European perspective". ... ventricular arrhythmia) ଯୋଗୁ ହୁଏ ଯାହା ନିଳୟରୁ (en:ventricle) ଆରମ୍ଭ ହୁଏ ।[୧] ଇସିଜି (en:electrocardiogram), ହୋଲ୍ଟର ମୋନିଟର (holter ...
Rapid temperature changes in the heart may precipitate ventricular fibrillation. Electrolyte imbalance[edit]. Administering a ...
... often leading to ventricular fibrillation. This is a type of tachycardia that originates from above the ventricles, such as the ... Atrial fibrillation is one of the most common cardiac arrhythmias. In general, it is an irregular, narrow complex rhythm. ... Ventricular tachycardia (VT or V-tach) is a potentially life-threatening cardiac arrhythmia that originates in the ventricles. ... Depending on the patient's health and other variables such as medications taken for rate control, atrial fibrillation may cause ...
... often leading to ventricular fibrillation.[citation needed] Supraventricular[edit]. Main article: Supraventricular tachycardia ... Ventricular[edit]. Main article: Ventricular tachycardia. Ventricular tachycardia (VT or V-tach) is a potentially life- ... Atrial fibrillation[edit]. Atrial fibrillation is one of the most common cardiac arrhythmias. In general, it is an irregular, ... Ventricular tachycardia, any tachycardia that originates in the ventricles. *Any narrow complex tachycardia combined with a ...
"Complex" ablations include ablation for arrhythmias such as multifocal atrial tachycardia, atrial fibrillation, and ventricular ...
Fibrillation can affect the atrium (atrial fibrillation) or the ventricle (ventricular fibrillation); ventricular fibrillation ... Defibrillation differs in that it is used for ventricular fibrillation and pulseless ventricular tachycardia, and more ... Ventricular fibrillation occurs in the ventricles (lower chambers) of the heart; it is always a medical emergency. If left ... Almost every person goes into ventricular fibrillation in the last few minutes of life as the heart muscle reacts to diminished ...
... it is also possible to find left ventricular hypertrophy, bundle branch blocks, and abnormal displacement of the ostium in the ... right coronary artery in association with QAV.[4][6] Some research has shown increased incidences of atrial fibrillation to be ...
Atrial fibrillation *Familial. *Ventricular fibrillation. Pacemaker. *Ectopic pacemaker / Ectopic beat. *Multifocal atrial ...
"Outcomes in atrial fibrillation patients with and without left ventricular hypertrophy when treated with a lenient rate-control ... Valvular atrial fibrillation refers to atrial fibrillation attributable to moderate to severe mitral valve stenosis or atrial ... There are multiple theories about the cause of atrial fibrillation. An important theory is that, in atrial fibrillation, the ... Northwestern Surgery for Atrial Fibrillation. Atrial Fibrillation Surgery Archived 19 April 2012 at the Wayback Machine ...
... slow left ventricular relaxation time, right tricuspid valve regurgitation), preferential distribution of blood flow to the ... pulmonary infection or atrial fibrillation, inflammation, longer distances, longer duration of exercise, hard surfaces, ...
The negative chronotropic effects of CCBs make them a commonly used class of agents in individuals with atrial fibrillation or ... If unsuccessful, ventricular pacing should be used.[20]. Non-medical calcium channel inhibitorsEdit. EthanolEdit. ... especially from atrial fibrillation), to prevent peripheral and cerebral vasospasm, and to reduce chest pain caused by angina ...
... tachyarrhythmias or ventricular fibrillation, or hypersensitivity to ephedrine or other stimulants. Ephedrine should not be ...
During left ventricular diastole, after the pressure drops in the left ventricle due to relaxation of the ventricular ... "Effect of atrial fibrillation on the dynamics of mitral annular area". The Journal of Heart Valve Disease. 12 (1): 31-7. PMID ... The late filling of the left ventricle contributes about 20% to the volume in the left ventricle prior to ventricular systole ... This early filling phase is due to active relaxation of the ventricular myocardium, causing a pressure gradient that allows a ...
心室顫動(英語簡稱V-Fib或VF),是其中一種心律不整的表徵。( Ventricular fibrillation (VF) showing disorganized electrical activity producing a spiked ... premature ventricular contractions)。心室上心搏過速包括心房顫動、心房撲動、以及陣發性心室上心搏過速。心室心律不整包括心室顫動
The most severe form of arrhythmia is ventricular fibrillation which is the most common cause of cardiac arrest and subsequent ... Left ventricular end diastolic posterior wall dimension. LVPWd. The thickness of the posterior left ventricular wall.. 8.3 mm,[ ... Right ventricular pressure demonstrates a different pressure-volume loop than left ventricular pressure.[11] ... also called ventricular extra beats. When these beats become grouped the condition is known as ventricular tachycardia. ...
... results from the National Registry of Atrial Fibrillation 2". Archives of Internal Medicine. 166 (2): 241-6. doi:10.1001/ ... "The hemorrhage risk of prophylactic external ventricular drain insertion in aneurysmal subarachnoid hemorrhage patients ... "NOACs Now Mainstream for the Use of Anticoagulation in Non-Valvular Atrial Fibrillation in Australia". Heart, Lung and ... and to prevent emboli in patients with atrial fibrillation (AF), and mechanical prosthetic heart valves. Other examples are ...
"Fish oil supplementation and risk of ventricular tachycardia and ventricular fibrillation in patients with implantable ... Results of the survival and ventricular enlargement trial. The SAVE Investigators". N Engl J Med. 327 (10): 669-77. doi:10.1056 ... Keating G, Plosker G (2004). "Eplerenone: a review of its use in left ventricular systolic dysfunction and heart failure after ... Bosch X, Theroux P. (2005). "Left ventricular ejection fraction to predict early mortality in patients with non-ST-segment ...
en:Ventricular fibrillation (33) → 심실세동 *en:Vestibular schwannoma (18). *en:Veterinarian (64) → 수의사 ...
Fibrilasi atrial (bahasa Inggris: atrial fibrillation, A-fib, AF) adalah simtoma ritme denyut abnormal yang terjadi di jantung ... "New insights into the mechanisms and management of atrial fibrillation". Department of Medicine, Université de Montréal, ... "The mechanisms of atrial fibrillation in hyperthyroidism". Department of Hypertension, Department of Nephrology, Hypertension ...
It is used in recurrent atrial flutter (Afl), atrial fibrillation (AF), supraventricular tachycardia (SVT), atrial tachycardia ... Multifocal Atrial Tachycardia (MAT) and some types of ventricular arrhythmia. The energy-emitting probe (electrode) is at the ...
"Fatal ventricular fibrillation following verapamil in Wolff-Parkinson-White syndrome with atrial fibrillation". Annals of ... If it is caused by left heart disease, the treatment is to optimize left ventricular function by the use of medication or to ... Importantly, right ventricular remodeling is associated with increased apoptosis; this is in contrast to pulmonary vascular ... As such, the right ventricle cannot cope as well with higher pressures, and although right ventricular adaptations (hypertrophy ...
... have also established that piperazine can protect the heart against sudden cardiac death from ventricular fibrillation. ...
The most common indications for digoxin are atrial fibrillation and atrial flutter with rapid ventricular response, though beta ... It may cause AV junctional rhythm and ectopic beats (bigeminy) resulting in ventricular tachycardia and fibrillation. ... High ventricular rate leads to insufficient diastolic filling time. By slowing down the conduction in the AV node and ... For heart rate control (atrial fibrillation), plasma levels are less defined and are generally titrated to a goal heart rate. ...
The QRS complex will also be narrow in LGL syndrome, as opposed to WPW, because ventricular conduction is via the His-Purkinje ... atrial fibrillation, or atrial flutter.[4] ...
Tamargo J, Caballero R, Delpón E (January 2004). "Pharmacological approaches in the treatment of atrial fibrillation". Curr. ... "Uniform action potential repolarization within the sarcolemma of in situ ventricular cardiomyocytes". Biophys. J. 96 (6): 2532 ...
Ventricular reduction. Alcohol septal ablation. Conduction system. Maze procedure Cox maze and minimaze. Catheter ablation ... "Cryoablation for the Treatment of Atrial Fibrillation". Retrieved May 23, 2015.. *^ Peter W. Macfarlane, Adriaan van Oosterom, ... During EPS, sinus rhythm as well as supraventricular and ventricular arrhythmias of baseline cardiac intervals is recorded.[1] ...
Premature ventricular contraction. References[edit]. *^ Tipton MJ, Kelleher PC, Golden FS Institute of Naval Medicine, Gosport ... On the surface ECG, premature junctional contractions will appear as a normally shaped ventricular complex or QRS complex, not ... Atrial fibrillation *Familial. *Ventricular fibrillation. Pacemaker. *Ectopic pacemaker / Ectopic beat. *Multifocal atrial ...
This is important mainly in patients with atrial fibrillation, in whom heart beats are irregular and stroke volume is largely ... Fox K, Ford I (2008). "Heart rate as a prognostic risk factor in patients with coronary artery disease and left-ventricular ... Salerno DM, Zanetti J (1991). "Seismocardiography for monitoring changes in left ventricular function during ischemia". Chest. ... Severely high hypernatremia may lead to fibrillation, which may cause CO to cease. Severe hyponatremia leads to both ...
With support from collagen, atrial fibrillation should never deteriorate to ventricular fibrillation. Collagen is layered in ...
Ventricular fibrillation (VF) is a severely abnormal heart rhythm (arrhythmia) that is life threatening. ... Ventricular fibrillation (VF) is a severely abnormal heart rhythm (arrhythmia) that is life threatening. ... VF; Fibrillation - ventricular; Arrhythmia - VF; Abnormal heart rhythm - VF; Cardiac arrest - VF; Defibrillator - VF; ... Fibrillation is an uncontrolled twitching or quivering of muscle fibers (fibrils). When it occurs in the lower chambers of the ...
Ventricular fibrillation is an irregular rhythm caused by rapid, uncoordinated fluttering contractions of the hearts lower ... Ventricular fibrillation is more serious than atrial fibrillation. Ventricular fibrillation frequently results in loss of ... How is ventricular tachycardia connected to VFib?. Ventricular fibrillation usually begins with ventricular tachycardia. ... Ventricular fibrillation (VFib) may be confused with atrial fibrillation (AFib). Both involve irregular heart rhythms, but they ...
... the guidelines can ensure that relatively few treated patients die in ventricular fibrillation and only those with irreversible ... Ventricular fibrillation.. Br Med J (Clin Res Ed) 1986; 292 doi: https://doi.org/10.1136/bmj.292.6527.1068 (Published 19 April ...
... and treatment of AFib with rapid ventricular response, a condition that changes the rhythm of your heartbeat. ... AFib With Rapid Ventricular Response (RVR). Articles OnTypes of Atrial Fibrillation. Types of Atrial Fibrillation Types of ... "Control of ventricular rate in atrial fibrillation: Pharmacologic therapy."Control of ventricular rate in atrial fibrillation: ... Atrial fibrillation with rapid ventricular response is a fancy name for an irregular heartbeat. ...
What causes ventricular fibrillation?. The cause of ventricular fibrillation isnt always known. The most common cause is a ... Ventricular fibrillation. Ventricular fibrillation. In a normal heart rhythm, an electrical signal travels from the hearts ... Untreated VT will often lead to ventricular fibrillation.. Most cases of ventricular fibrillation are linked to some form of ... Some cases of ventricular fibrillation begin as a rapid heartbeat called ventricular tachycardia (VT). This rapid but regular ...
... is a life-threatening cardiac arrhythmia in which the coordinated contraction of the ventricular myocardium is replaced by high ... encoded search term (Ventricular Fibrillation) and Ventricular Fibrillation What to Read Next on Medscape ... Ventricular fibrillation appeared during rapid atrial fibrillation in a patient with Wolff-Parkinson-White syndrome. ... This image reveals ventricular fibrillation in a patient with a left ventricular assist device (LVAD). ...
The American Heart Association explains ventricular fibrillation or v-fib as the most serious cardiac rhythm disturbance. The ... Watch an animation of ventricular fibrillation.. Causes of ventricular fibrillation. V-fib can have several root causes, ... Ventricular fibrillation can cause sudden cardiac arrest (SCA), which requires immediate medical attention. Signs of cardiac ... If youre at risk for ventricular fibrillation and its serious consequences, your doctor may recommend:. *Arrhythmia ...
Asystole and ventricular fibrillation associated with cocaine intoxication.. Nanji AA, Filipenko JD. ... discuss a patient with cocaine intoxication in whom the initial presentation was that of asystole and ventricular fibrillation ... Cocaine intoxication should be considered in any patient with unexplained cardiac arrest or ventricular arrhythmias. ...
Ventricular fibrillation (VF) begins as a quasiperiodic reentrant pattern of excitation in the ventricles with resulting poorly ... encoded search term (Ventricular Fibrillation in Emergency Medicine) and Ventricular Fibrillation in Emergency Medicine ... Ventricular Fibrillation in Emergency Medicine. Updated: Dec 30, 2015 * Author: Keith A Marill, MD; Chief Editor: Erik D ... Out-of-hospital ventricular fibrillation in children and adolescents: causes and outcomes. Ann Emerg Med. 1995 Apr. 25(4):484- ...
... and ventricular fibrillation (VFib) are both heart conditions that are referred to as arrhythmias. Common Symptoms of AFib are ... Atrial fibrillation and ventricular fibrillation are heart conditions that include the term "fibrillation." When defined as ... Ventricular fibrillation symptoms and signs. In contrast, ventricular fibrillation (VFib) has very short-lived signs and ... Atrial Fibrillation vs. Ventricular Fibrillation (AFib vs VFib Symptoms, ECG Strips). *Medical Author: Charles Patrick Davis, ...
Ventricular fibrillation is initially found in about 10% of people with cardiac arrest. Ventricular fibrillation can occur due ... MacWilliam spent many years working on ventricular fibrillation and was one of the first to show that ventricular fibrillation ... on the basis of the fact that ventricular fibrillation itself is common, idiopathic ventricular fibrillation accounts for an ... of the cases of ventricular fibrillation unrelated to myocardial infarction, and 14% of all ventricular fibrillation ...
... including ventricular tachycardia, ventricular fibrillation, atrial flutter & atrial fibrillation treatment options. ... Tachycardia can be ventricular (in the lower chambers of the heart) or atrial (in the upper chambers of the heart). Your heart ...
PVF is defined as ventricular fibrillation not preceded by heart failure or shock, in contrast to secondary ventricular ... Primary ventricular fibrillation (PVF) is an unpredictable and potentially fatal arrhythmia occurring during the acute phase of ... Volpi A, Cavalli A, Santoro L, Negri E (1998). "Incidence and prognosis of early primary ventricular fibrillation in acute ... "Long Term Survival after First Myocardial Infarction is not Determined by the Occurrence of Ventricular Fibrillation in the ...
Home , July-August 1929 - Volume 8 - Issue 4 , Sudden Death from Ventricular Fibrillation. ...
Defibrillator Implantation Without Induction of Ventricular Fibrillation. Good Enough?. Anne B. Curtis ... Despite the fact that we usually call the sequence of induction of ventricular fibrillation (VF) and defibrillation at ... Safety of a single successful conversion of ventricular fibrillation before the implantation of cardioverter defibrillators. ... In ASSURE, over a follow-up period of 9.5±4.5 months, there were 45 treated episodes (25 VF, 17 ventricular tachycardia, and 3 ...
A, Preexcited atrial fibrillation degenerating to ventricular fibrillation. B, Ventricular fibrillation converting back to ... From Atrial Fibrillation to Ventricular Fibrillation and Back. Axel Sarrias, Roger Villuendas, Felipe Bisbal, Damià Pereferrer ... From Atrial Fibrillation to Ventricular Fibrillation and Back. Axel Sarrias, Roger Villuendas, Felipe Bisbal, Damià Pereferrer ... From Atrial Fibrillation to Ventricular Fibrillation and Back. Axel Sarrias, Roger Villuendas, Felipe Bisbal, Damià Pereferrer ...
If the attempt is unsuccessful, atrial fibrillation is eliminated as a cause of the ventricular rate instability and other ... measuring the R-R intervals of successive ventricular beats. If the ventricular rate is found to be unstable, the ventricle is ... If the attempt is unsuccessful, atrial fibrillation is assumed and, if necessary, corresponding therapy is applied. ... For this purpose, the ventricular rate stability is monitored by, for example, ...
Is it possible to develope ventricular tachycardia, fibrillation, or wolf-Parkinsons disease?. Asked. 12 Sep 2015 by JD3581. ... My main question is, is it possible to develop ventricular tachycardia, fibrillation, or wolf-Parkinsons disease I believe ... Hi, just came across this group trying to find out info on Ventricular tachycardia. I went to heart?. Posted 23 Mar 2013 • 2 ... I have been on Metoprolol Succ ER 50 MG for 2 weeks to treat supra ventricular tachycardia?. Posted 11 Feb 2016 • 1 answer ...
We report a case of a 59-year-old man with idiopathic ventricular fibrillation storm. Ventricular fibrillation was pause- ... dependent and triggered by an early-coupled right ventricular premature comple ... We report a case of a 59-year-old man with idiopathic ventricular fibrillation storm. Ventricular fibrillation was pause- ... dependent and triggered by an early-coupled right ventricular premature complex. The characteristic premature beat was mapped ...
Premature Ventricular Contractions (PVCs) • Ventricular tachycardia • Ventricular Fibrillation • Sudden cardiac death ... Differentiating Ventricular Fibrillation from other Diseases. Epidemiology and Demographics. Risk Factors. Natural History, ... de:Kammerflimmern he:פרפור חדרים it:Fibrillazione ventricolare nl:Ventrikelfibrilleren simple:Ventricular fibrillation fi: ... Ventricular Arrhythmias. Differential Diagnosis of Tachycardia with a Wide QRS Complex • Accelerated Idioventricular Rhythm • ...
What causes ventricular fibrillation?. The cause of ventricular fibrillation isnt always known. The most common cause is a ... Pulse check. In ventricular fibrillation, there will be no pulse.. Tests to diagnose the cause of ventricular fibrillation. To ... Untreated VT will often lead to ventricular fibrillation.. Most cases of ventricular fibrillation are linked to some form of ... If it detects ventricular tachycardia or ventricular fibrillation, it sends out low- or high-energy shocks to reset your heart ...
Suspected electrically induced ventricular fibrillation during thoracoscopic partial pericardectomy in two dogs. 01 Feb 2019 ... This report describes the occurrence of ventricular fibrillation in two dogs while using an electrosurgical unit inside the ...
Ventricular fibrillation usually causes a loss of consciousness and is a medical emergency because the brain and body are no ... Ventricular fibrillation is a very fast, irregular heartbeat that is caused by abnormal firing of electrical signals in the ... In ventricular fibrillation, disorganized electrical impulses in the hearts lower chambers cause the heart to stop beating ( ... If ventricular fibrillation is not treated, it may result in sudden cardiac arrest and death. ...
After a round of CPR, patient remains pulseless with persisting ventricular fibrillation on the monitor. You defibrillate a ...
Ventricular Fibrillation. How Do We Stop the Waves From Breaking?. James N. Weiss, Peng-Sheng Chen, Zhilin Qu, Hrayr S. ... Jalife J. Ventricular fibrillation: mechanisms of initiation and maintenance. Annu Rev Physiol. 2000;62:25-50. ... Ventricular fibrillation (VF) remains the most common cause of sudden death. We briefly review the recent synergism between ... Weiss JN, Garfinkel A, Karaguezian HS, Qu Z, Chen P-S. Chaos and the transition to ventricular fibrillation: a new approach to ...
Amplitude spectrum area to guide defibrillation: a validation on 1617 patients with ventricular fibrillation.. Ristagno G1, ...
... recovery and follow-up care for Ventricular fibrillation. ... Ventricular fibrillation (VF) is a severely abnormal heart ... Learn about Ventricular fibrillation, find a doctor, complications, outcomes, ... Ventricular fibrillation. VF; Fibrillation - ventricular; Arrhythmia - VF; Abnormal heart rhythm - VF; Cardiac arrest - VF; ... Fibrillation is an uncontrolled twitching or quivering of muscle fibers (fibrils). When it occurs in the lower chambers of the ...
6011000124106~MAPADVICE~IF VENTRICULAR FIBRILLATION AND FLUTTER CHOOSE I49.02 , CONSIDER ADDITIONAL CODE TO IDENTIFY SPECIFIC ... http://ncicb.nci.nih.gov/xml/owl/EVS/Thesaurus.owl#Ventricular_Fibrillation Cigarette Smoke Exposure Ontology LOOM ... http://www.owl-ontologies.com/Ontology1358660052.owl#Ventricular_Fibrillation Pediatric Terminology LOOM ... http://www.semanticweb.org/ontologies/2012/5/Ontology1338526551855.owl#Ventricular_fibrillation Resource of Asian Primary ...
Ventricular fibrillation was induced with a 9 V ordinary cadmium battery via a pacing wire forwarded into the right ventricle ... Ventricular fibrillation was induced via pacing wire forwarded into the right ventricle in 20 female Landrace/Large White pigs ... Effects of Erythropoietin Administration on Adrenal Glands of Landrace/Large White Pigs after Ventricular Fibrillation. Armando ... In animals exposed to ventricular fibrillation, EPO treatment has protective effects on the adrenal gland. ...
Ventricular fibrillation was induced via pacing wire forwarded into the right ventricle in 20 female Landrace/Large White pigs ... Effects of Erythropoietin Administration on Adrenal Glands of Landrace/Large White Pigs after Ventricular Fibrillation. Armando ... In animals exposed to ventricular fibrillation, EPO treatment has protective effects on the adrenal gland. ... To evaluate the effects of erythropoietin administration on the adrenal glands in a swine model of ventricular fibrillation and ...
  • A condition in which the lower chambers of your heart beat too rapidly (ventricular tachycardia, or VT) can lead to ventricular fibrillation. (mayoclinic.org)
  • Some cases of ventricular fibrillation begin as a rapid heartbeat called ventricular tachycardia (VT). (mayoclinic.org)
  • ventricular tachycardia (VT), ventricular fibrillation (VF), pulseless electrical activity (PEA), and asystole . (medscape.com)
  • Tachycardia can be ventricular (in the lower chambers of the heart) or atrial (in the upper chambers of the heart). (medtronic.com)
  • It shows an irregular wide-complex tachycardia with different degrees of QRS widening, consistent with preexcited atrial fibrillation with very fast conduction to the ventricles. (ahajournals.org)
  • A cardiac implant device is provided in which the ventricular rate is monitored to differentiate between atrial fibrillation and ventricular tachycardia or other cardiac conditions. (google.com)
  • classifying means for classifying said ventricular instability as corresponding to one of atrial fibrillation and ventricular tachycardia from a response to said pacing signals. (google.com)
  • Is it possible to develope ventricular tachycardia, fibrillation, or wolf-Parkinson's disease? (drugs.com)
  • My main question is, is it possible to develop ventricular tachycardia, fibrillation, or wolf-Parkinson's disease I believe it's called. (drugs.com)
  • Hi, just came across this group trying to find out info on Ventricular tachycardia. (drugs.com)
  • I have been on Metoprolol Succ ER 50 MG for 2 weeks to treat supra ventricular tachycardia? (drugs.com)
  • Figure 1A ⇓ illustrates an ECG of a person suddenly developing VF, typifying the clinical observation that VF is almost always preceded by ventricular tachycardia (VT), lasting from a few to many beats. (ahajournals.org)
  • 1 This tachycardia induced cardiomyopathy is characterised by decreased systolic function, ventricular dilation, and raised ventricular filling pressures. (bmj.com)
  • Self-sustaining patterns of aberrant excitation in the heart, re-entries, are the cause of dangerously accelerated heartrates (tachycardia) and complete losses of synchronized action (fibrillation) ( Wit and Cranefield, 1978 ). (frontiersin.org)
  • To compare the efficacy and safety of nifekalant, a pure class III anti-arrhythmic drug, and lidocaine in patients with shock-resistant in-hospital ventricular fibrillation (VF) or ventricular tachycardia (VT). (unboundmedicine.com)
  • In this paper, a novel, and computationally fast method was proposed to classify ventricular tachycardia (VT) and ven- tricular fibrillation (VF) by using histogram and average absolute deviation. (actapress.com)
  • The objective of this randomized controlled trial is to evaluate the effectiveness of a low cumulative dose of epinephrine compared to a standard cumulative dose of epinephrine during resuscitation from ventricular fibrillation (VF) or ventricular tachycardia (VT) in adult out-of-hospital cardiac arrest (OHCA) patients. (pfizer.com)
  • 300 mg will be given IV/IO push for reoccurrence of ventricular fibrillation or pulseless ventricular tachycardia after 1 or more shocks. (clinicaltrials.gov)
  • What are Ventricular Tachycardia and Ventricular Fibrillation? (differencebetween.net)
  • Ventricular Tachycardia and Ventricular Fibrillation are both a group of conditions where the heartbeat is irregular, too slow, or too fast. (differencebetween.net)
  • Ventricular Tachycardia is a medical condition wherein the electrical impulses produced in the SA node are substituted by an ectopic pacemaker. (differencebetween.net)
  • Ventricular Tachycardia is a medical condition which is associated with the hearts irregular electrical impulses. (differencebetween.net)
  • The exact factor causing ventricular tachycardia is actually unknown. (differencebetween.net)
  • Any medical disorder that induces strain or any kind of pressure on the heart cells or damages heart linings can increase the risk of ventricular tachycardia. (differencebetween.net)
  • In case, an individual has a family history of vtach or some other heart issues, he is at a higher risk of ventricular tachycardia. (differencebetween.net)
  • The presence of a fusion beat and atrioventricular dissociation suggested ventricular tachycardia (VT). (revespcardiol.org)
  • Intracellular calcium overload underlies the mechanism of VF in catecholaminergic polymorphic ventricular tachycardia (CPVT). (thefreelibrary.com)
  • To support this statement, Ogawa et al referred to their own (unpublished) results in Langendorff-perfused rabbit hearts indicating that after 30 minutes of perfusion with 20 μmol/L BAPTA-AM, rapid pacing caused Ca i transient alternans and eventual initiation of VF, whereas, after 70 minutes of BAPTA-AM perfusion, Ca i transient alternans was no longer present and only monomorphic ventricular tachycardia could be induced. (ahajournals.org)
  • 1 The condition involves malignant ventricular arrhythmia, polymorphic ventricular tachycardia and ventricular fibrillation and has a high recurrence rate. (revespcardiol.org)
  • In a retrospective chart review, we analysed the outcomes of 182 patients who suffered bystander-witnessed, out-of-hospital ventricular fibrillation or pulseless ventricular tachycardia of cardiac aetiology. (smw.ch)
  • Background: To explore the conditions most dangerous for the emergence of sustained Ventricular Tachycardia or Ventricular Fibrillation (VT/VF) a new computational model of ventricular myocardium including 2592 finite elements in three dimensions was created. (omicsonline.org)
  • In ventricular tachycardia or ventricular fibrillation (VT/VF, or simply VF for short) wavelets of electrical activation propagate, seemingly randomly, across the myocardium, leading to profound reduction or complete loss of pumping action. (omicsonline.org)
  • T5 spinal cord transection increases susceptibility to reperfusion-induced ventricular tachycardia by enhancing sympathetic activity in conscious rats. (semanticscholar.org)
  • 30 sec. 88 subjects were analyzed, with a total of 285 shocks, with 226 shocks that achieved asystole (N=102), organized rhythm (OR) (N=120) or monomorphic ventricular tachycardia (N=4). (ahajournals.org)
  • Ventricular flutter and ventricular fibrillation are conditions where the ventricles beat too quickly (tachycardia) or irregularly. (healthguideinfo.com)
  • This procedure is a treatment for ventricular tachycardia (V-tach) which often can trigger V-fib. (providence.org)
  • This trial was pivitol to amiodarone's incorporation into the ACLS algorithm for refractory pulseless ventricular tachycardia (v-tach) or ventricular fibrillation (v-fib). (ebmconsult.com)
  • The ventricular muscle twitches randomly rather than contracting in a co-ordinated fashion (from the apex of the heart to the outflow of the ventricles), and so the ventricles fail to pump blood around the body - because of this, it is classified as a cardiac arrest rhythm, and patients in V-fib should be treated with cardiopulmonary resuscitation (CPR) and prompt defibrillation. (wikipedia.org)
  • This episode of ventricular fibrillation (VF) occurred in the emergency department and was present for less than 30 seconds prior to defibrillation, hence the coarse morphology. (medscape.com)
  • Despite the fact that we usually call the sequence of induction of ventricular fibrillation (VF) and defibrillation at different energies in the electrophysiology laboratory "defibrillation threshold testing," it is, in fact, usually a DSM that is determined. (ahajournals.org)
  • 1 It is of particular interest in this patient that the instant of degeneration to ventricular fibrillation could be registered, and defibrillation was unusually difficult. (ahajournals.org)
  • Amplitude spectrum area to guide defibrillation: a validation on 1617 patients with ventricular fibrillation. (nih.gov)
  • Yakaitis RW, Ewy GA, Otto CW, Taren DL, Moon TE (1980) Influence of time and therapy on ventricular defibrillation in dogs. (springer.com)
  • Cobb LA, Fahrenbruch CE, Walsh TR, et al (1999) Influence of cardiopulmonary resuscitation prior to defibrillation in patients with out-of-hospital ventricular fibrillation. (springer.com)
  • Wik L, Hansen TB, Fylling F, Vaagenes P, Steen P (2001) Three minutes of basic cardiopulmonary resuscitation (CPR) of pre-hospital ventricular defibrillation (VF) patients increases the number of patients who restore spontaneous circulation. (springer.com)
  • Kern KB, Garewal HS, Sanders AB, et al (1990) Depletion of myocardial adenosine triphosphate during prolonged untreated ventricular fibrillation: effect on defibrillation success. (springer.com)
  • A 54-year-old man without significant medical history presented with sudden-onset chest discomfort and multiple episodes of ventricular fibrillation requiring external defibrillation and cardiopulmonary resuscitation. (physiciansweekly.com)
  • Methods A total of 194 ICD recipients (64 +/- 12 years, 83% male, 95% primary prevention of sudden cardiac death, 35% cardiac resynchronization therapy) were randomly assigned to one of three implantation strategies: (1) ICD implantation without any defibrillation threshold (DFT) testing,(2) estimation of the DFT without arrhythmia induction (modified "upper limit of vulnerability (ULV) testing") or (3) traditional safety margin testing including ventricular arrhythmia induction. (uni-muenchen.de)
  • An automated external defibrillator detected ventricular fibrillation (VF), and a defibrillation shock was delivered by ambulance attendants. (deepdyve.com)
  • The definitive treatment for ventricular fibrillation (VF) is defibrillation and the speed with which this can be applied is an important factor in determining survival for victims of out of hospital VF. (biomedcentral.com)
  • Ventricular fibrillation (VF) is a severely abnormal heart rhythm ( arrhythmia ) that is life threatening. (medlineplus.gov)
  • Primary ventricular fibrillation (PVF) is an unpredictable and potentially fatal arrhythmia occurring during the acute phase of a myocardial infarction leading to immediate collapse and, if left untreated, leads to sudden cardiac death within minutes. (wikipedia.org)
  • Atrial fibrillation or AFib , and ventricular fibrillation or VFib, are both a type of abnormal heart rhythm or heartbeat called an arrhythmia . (rxlist.com)
  • Atrial fibrillation is the most common sustained cardiac arrhythmia in the general population. (medworm.com)
  • To our knowledge, we here report the first genome-wide association study for this trait, conducted in a set of 972 individuals with a first acute myocardial infarction, 515 of whom had ventricular fibrillation and 457 of whom did not, from the Arrhythmia Genetics in The Netherlands (AGNES) study. (nih.gov)
  • Ventricular Arrhythmia Risk Prediction in Repaired Tetralogy of Fallot using Personalized Computational Cardiac Models. (annals.org)
  • Arrhythmia characterized by fibrillary contractions of the ventricular muscle due to rapid repetitive excitation of myocardial fibers without coordinated contraction of the ventricle. (icd10data.com)
  • The Danish Investigations of Arrhythmia and Mortality ON Dofetilide (DIAMOND) studies included 2627 patients without atrial fibrillation at baseline, who were randomised to treatment with either dofetilide or placebo. (sigmaaldrich.com)
  • Brugada syndrome is a clinical and electrocardiographic entity characterized by ST segment elevation in the right precordial ECG leads and sudden death or syncope secondary to malignant ventricular arrhythmia, and has a high recurrence rate. (revespcardiol.org)
  • Percent incidence of heart arrhythmia and Ventricular fibrillation in isolated rabbit hearts at a concentration of 3 uM. (nih.gov)
  • Atrial fibrillation (AF) remains the most common arrhythmia encountered in clinical practice. (lu.se)
  • inproceedings{7773481c-f379-451b-8cd0-602bdc2b607c, abstract = {Atrial fibrillation (AF) remains the most common arrhythmia encountered in clinical practice. (lu.se)
  • Atrial fibrillation has recently emerged as the most common cardiac arrhythmia in clinical practice (1) . (onlinejacc.org)
  • Ventricular fibrillation â€" Comprehensive overview covers the causes and treatments of this life-threatening heart arrhythmia. (drugster.info)
  • Ventricular fibrillation (VF) is the most commonly identified arrhythmia in cardiac arrest patients. (drugster.info)
  • Atrial fibrillation is the most common form of an irregular heartbeat, or arrhythmia. (healthguideinfo.com)
  • The difference which differentiates ventricular flutter versus ventricular fibrillation is the nature of the arrhythmia. (healthguideinfo.com)
  • Ventricular fibrillation (V-fib) is a dangerous type of arrhythmia, or irregular heartbeat. (providence.org)
  • Ventricular fibrillation is an arrhythmia that starts in your ventricle. (providence.org)
  • If this rate is severely affected (by a ventricular arrhythmia) heart no longer fulfills the role of the pump and vital organ perfusion is compromised. (heartupdate.com)
  • When the two lower chambers beat irregularly and flutter, the patient has ventricular fibrillation (VFib). (medicalnewstoday.com)
  • This can occur during VT or in conditions, such as Wolff-Parkinson-White syndrome , when atrial fibrillation or flutter waves pass rapidly through a bypass tract to the ventricular musculature. (medscape.com)
  • Impact of atrial fibrillation/flutter on the in-hospital mortality of ischemic stroke patients. (annals.org)
  • To examine the prevalence of left ventricular hypertrophy by electrocardiographic (EKG) criteria, versus atrial fibrillation or flutter, in patients receiving an EKG for a diagnosis of stroke. (ovid.com)
  • The EKGs were evaluated for the presence of LVH or atrial fibrillation/flutter. (ovid.com)
  • In our cohort nearly one third of patients with stroke were in sinus rhythm, but had left ventricular hypertrophy by EKG, a prevalence that was four time that of atrial fibrillation or atrial flutter, and three time the prevalence of LVH in the overall database. (ovid.com)
  • This article looks at circumstances where the heart does not beat as efficiently as it should and considers the difference between ventricular flutter versus ventricular fibrillation. (healthguideinfo.com)
  • In the case of ventricular flutter, the electrical stimulation is regular, but very fast, leading to a circular depolarisation of the ventricle and loss of output, although some blood may be ejected from the heart. (healthguideinfo.com)
  • Often, ventricular flutter will deteriorate into ventricular fibrillation. (healthguideinfo.com)
  • It is also notable that ventricular fibrillation occurs where there is no discernible heart pathology or other evident cause, the so-called idiopathic ventricular fibrillation. (wikipedia.org)
  • citation needed] Idiopathic ventricular fibrillation occurs with a reputed incidence of approximately 1% of all cases of out-of-hospital arrest, as well as 3-9% of the cases of ventricular fibrillation unrelated to myocardial infarction, and 14% of all ventricular fibrillation resuscitations in patients under the age of 40. (wikipedia.org)
  • It follows then that, on the basis of the fact that ventricular fibrillation itself is common, idiopathic ventricular fibrillation accounts for an appreciable mortality. (wikipedia.org)
  • Severe left ventricular dysfunction, a variety of cardiomyopathies, and acquired or idiopathic long QT syndrome also increase the risk of fibrillation. (medscape.com)
  • Idiopathic Ventricular Fibrillation Originating from the Moderator Band. (biomedsearch.com)
  • We report a case of a 59-year-old man with idiopathic ventricular fibrillation storm. (biomedsearch.com)
  • Exome sequencing identifies a mutation in the ACTN2 gene in a family with idiopathic ventricular fibrillation, left ventricular noncompaction, and sudden death. (centenary.org.au)
  • While some individuals were asymptomatic, other presentations included left ventricular non-compaction, a resuscitated cardiac arrest due to idiopathic ventricular fibrillation, dilated cardiomyopathy, and sudden unexplained death. (centenary.org.au)
  • Idiopathic ventricular fibrillation can be caused by subclinical channelopathies such as Brugada syndrome. (pagepressjournals.org)
  • Our objective is to study the clinical behaviour of a new SCN5A mutation found in a woman with idiopathic ventricular fibrillation. (pagepressjournals.org)
  • The D1816fs/g98747-98748insT mutation in SCN5A may be associated with idiopathic ventricular fibrillation and Brugada syndrome with a broad phenotypic spectrum and incomplete penetrance. (pagepressjournals.org)
  • Genetic testing may be useful to identify the etiology of idiopathic ventricular fibrillation in patients with a negative thorough clinical evaluation. (pagepressjournals.org)
  • Novel SCN5A mutation associated with idiopathic ventricular. (pagepressjournals.org)
  • In approximately 5 to 12% of cases, there are no demonstrable cardiac or noncardiac causes to account for the episode, which is therefore classified as idiopathic ventricular fibrillation (IVF). (diseaseinfosearch.org)
  • Idiopathic ventricular fibrillation (without an identifiable cause) occurs in 1% of cases of sudden death, in 14% of patients under 40 years and 3% of patients undergoing ventricular fibrillation in the absence of myocardial infarction. (heartupdate.com)
  • Prognosis of acute myocardial infarction complicated by primary ventricular fibrillation. (wikipedia.org)
  • One-year prognosis of primary ventricular fibrillation complicating acute myocardial infarction. (wikipedia.org)
  • In western countries with aging populations, atrial fibrillation poses a significant health concern, as it is associated with a high risk of thromboembolism, stroke, congestive heart failure, and myocardial infarction. (medworm.com)
  • Sudden cardiac death from ventricular fibrillation during acute myocardial infarction is a leading cause of total and cardiovascular mortality. (nih.gov)
  • The association of rs2824292 with ventricular fibrillation was replicated in an independent case-control set consisting of 146 out-of-hospital cardiac arrest individuals with myocardial infarction complicated by ventricular fibrillation and 391 individuals who survived a myocardial infarction (controls) (odds ratio = 1.49, 95% CI 1.14-1.95, P = 0.004). (nih.gov)
  • Ventricular fibrillation (VF) occurring in the first minutes to hours of acute myocardial infarction (AMI) is a frequent cause of death and treatment options are limited. (springer.com)
  • Incidence of sudden cardiac death after ventricular fibrillation complicating acute myocardial infarction: A 5-year cause-of-death analysis of the FAST-MI 2005 registry. (freecme.com)
  • Currently, more evidence is needed to warrant implantable cardioverter-defibrillator (ICD) therapy than simply ventricular fibrillation soon after acute myocardial infarction (MI). (freecme.com)
  • Nonetheless, the authors concluded that development of ventricular fibrillation during the acute states of myocardial infarction is associated with higher risk of in-hospital mortality. (freecme.com)
  • Incidence of atrial fibrillation in patients with either heart failure or acute myocardial infarction and left ventricular dysfunction: a cohort study. (sigmaaldrich.com)
  • The competing risk analyses estimated the cumulative incidences of atrial fibrillation during the 42 months of follow-up to be 9.6% in the placebo-treated heart failure-group, and 2.9% in the placebo-treated myocardial infarction-group. (sigmaaldrich.com)
  • In the myocardial infarction-group the incidence of atrial fibrillation was reduced to 1.7% with the administration of dofetilide. (sigmaaldrich.com)
  • What is the clinical significance of new-onset atrial fibrillation (AF) after discharge from the hospital in patients with an acute myocardial infarction (AMI)? (acc.org)
  • Most cases of ventricular fibrillation are linked to some form of heart disease. (riversideonline.com)
  • Obtaining a thorough history from the patient, family members, or other witnesses is necessary to obtain insight into the events surrounding the episode of ventricular fibrillation (VF). (medscape.com)
  • We report a patient with this syndrome who had received an automatic implantable defibrillator, who presented with multiple appropriate discharges because of recurrent episodes of ventricular fibrillation. (revespcardiol.org)
  • A 53-year-old woman presented with multiple episodes of ventricular fibrillation, a structurally normal heart and normal baseline electrocardiogram. (pagepressjournals.org)
  • While improvements will doubtless be made as skill in resuscitation increases, the guidelines can ensure that relatively few treated patients die in ventricular fibrillation and only those with irreversible myocardial damage are likely to be converted to intractible asystole. (bmj.com)
  • To evaluate the effects of erythropoietin administration on the adrenal glands in a swine model of ventricular fibrillation and resuscitation. (hindawi.com)
  • Angelos MG, Menegazzi JJ, Callaway CW (2001) Bench to bedside: Resuscitation from prolonged ventricular fibrillation. (springer.com)
  • The induction of deep cerebral hypothermia via ice-cold saline aortic flush during prolonged ventricular fibrillation cardiac arrest, followed by hypothermic stasis and delayed resuscitation (emergency preservation and resuscitation), improved neurologic outcome after cardiac arrest in pigs, as compared to conventional resuscitation. (ovid.com)
  • Fifteen minutes of ventricular fibrillation cardiac arrest were followed by 20 mins of resuscitation with chest compressions (control, n = 8), deep cerebral hypothermia via 200 mL/kg 4°C saline aortic flush and hypothermic stasis (emergency preservation and resuscitation, n = 8), and emergency preservation and resuscitation combined with chest compressions (emergency preservation and resuscitation plus chest compressions, n = 8). (ovid.com)
  • The purpose of this study was designed to compare the quantitative characteristics of early post-resuscitation EEG between asphyxial CA (ACA) and ventricular fibrillation CA (VFCA) in rats. (springermedizin.de)
  • Garan H. Ventricular arrhythmias. (medlineplus.gov)
  • Recently described syndromes such as the Brugada Syndrome may give clues to the underlying mechanism of ventricular arrhythmias. (wikipedia.org)
  • Cocaine intoxication should be considered in any patient with unexplained cardiac arrest or ventricular arrhythmias. (nih.gov)
  • This highlights the fact that, even in the absence of overt preexcitation or with only minimal preexcitation apparent in the baseline ECG, an accessory pathway may be present that is capable of fast antegrade conduction, with the risk of lethal ventricular arrhythmias should atrial fibrillation occur. (ahajournals.org)
  • Further novel electrophysiological insights of particular relevance for ventricular arrhythmias arise from our multivariate analysis, including the role of incomplete activation of slow inward currents in mediating tissue rate-dependence and dispersion of repolarization, and the emergence of slow recovery of excitability as a significant promoter of this mechanism of dispersion and increased arrhythmic risk. (frontiersin.org)
  • Glukhov AV, Egorov IV et al (2007) The effect of hypothermia on the wavelength and vulnarability to ventricular arrhythmias in mammals. (springer.com)
  • Amiodarone resulted in a higher rate of survival to hospital admission in patients with out-of-hospital cardiac arrest and refractory ventricular arrhythmias. (ebmconsult.com)
  • The most common signs of ventricular fibrillation are sudden collapse or fainting, because the muscles and brain have stopped receiving blood from the heart. (medicalnewstoday.com)
  • Treatments to prevent sudden cardiac death for those at risk of ventricular fibrillation include medications and implantable devices that can restore a normal heart rhythm. (mayoclinic.org)
  • Ventricular fibrillation can cause sudden cardiac arrest (SCA), which requires immediate medical attention. (heart.org)
  • In contrast, VFib occurs when the electrical signal is chaotic within the ventricular muscular tissue and results in no effective heartbeat so there is no effective blood pressure or pulse generated, which results in sudden cardiac death of the individual if the abnormal heartbeat continues and is not treated immediately (immediately). (rxlist.com)
  • If ventricular fibrillation isn't treated immediately, the patient will have a "sudden death" or " cardiac arrest " and die. (rxlist.com)
  • Sudden Death from Ventricular Fibrillation. (lww.com)
  • Initial presentation was atrial fibrillation without the Brugada-type electrocardiogram, aborted cardiac arrest and positive family history of sudden death. (biomedsearch.com)
  • If ventricular fibrillation is not treated, it may result in sudden cardiac arrest and death. (medmovie.com)
  • Ventricular fibrillation (VF) remains the most common cause of sudden death. (ahajournals.org)
  • Unless emergency medical help is provided immediately, ventricular fibrillation will lead to cardiovascular collapse and sudden death. (lahey.org)
  • Despite well-developed emergency medical service (EMS) systems with rapid response advanced cardiac life support (ACLS) capabilities, survival rates for sudden out-of-hospital cardiac arrest have remained low in most venues, even for out-of-hospital ventricular fibrillation (VF), the highly-reversible cause of most sudden out-of-hospital cardiac arrest events [1-4]. (springer.com)
  • Incidences of death, including sudden cardiac death, non-sudden cardiac death, non-cardiac death, and deaths related to ventricular fibrillation, were the primary endpoints. (freecme.com)
  • Sudden cardiac death due to the induction of ventricular fibrillation (VF) by blunt chest wall blows is defined as commotio cordis. (thefreelibrary.com)
  • Infant Ventricular Fibrillation After ST-Segment Changes and QRS Widening A New Cause of Sudden Infant Death? (edu.au)
  • Miyake CY, Davis AM, Montonaga KS, Dubin AM, Berul CI, Cecchin F. Infant Ventricular Fibrillation After ST-Segment Changes and QRS Widening A New Cause of Sudden Infant Death? (edu.au)
  • Selective beta(2)-adrenoceptor blockade prevents ventricular fibrillation in a canine model of sudden cardiac death. (semanticscholar.org)
  • Endurance exercise training attenuates cardiac beta2-adrenoceptor responsiveness and prevents ventricular fibrillation in animals susceptible to sudden death. (semanticscholar.org)
  • In ventricular fibrillation (VF), the principal cause of sudden cardiac death, waves of electrical excitation break up into turbulent and incoherent fragments. (semanticscholar.org)
  • Ventricular fibrillation (VF) is said to cause more than 300,000 sudden deaths each year in the US alone. (diseaseinfosearch.org)
  • Atrial fibrillation with rapid ventricular response is a fancy name for an irregular heartbeat . (webmd.com)
  • That's a specific type of atrial fibrillation called AFib with rapid ventricular response. (webmd.com)
  • In AFib with rapid ventricular response, the ventricles also beat too fast. (webmd.com)
  • Does atrial fibrillation with rapid ventricular response cause ventricular fibrillation? (healthtap.com)
  • Can atrial fibrillation with rapid ventricular beat cause ventricular fibrillation? (healthtap.com)
  • however, if you also have an accessory pathway (wolff-parkinson-white syndrome), this is a unique situation where af is known to cause very rapid ventricular activation during af, which can lead to vf. (healthtap.com)
  • Rapid ventricular response may cause cardiac weakening over time, which in turn may increase the risk of vf. (healthtap.com)
  • The onset of atrial fibrillation with a rapid ventricular rate may cause an acute deterioration of cardiac function. (bestbets.org)
  • This therapy currently carries a class I indication in patients with atrial fibrillation who have failed to respond to antiarrhythmic drug therapy and a class IIb indication in patients with paroxysmal atrial fibrillation untreated with antiarrhythmic agents (1) . (onlinejacc.org)
  • 1. Case Report A 45-year-old man had visited his local hospital because of paroxysmal atrial fibrillation that had started 9 years earlier. (deepdyve.com)
  • Left ventricular stiffness estimated by diastolic wall strain is associated with paroxysmal atrial fibrillation in structurally normal hearts. (diseaseinfosearch.org)
  • Left ventricular diastolic dysfunction is associated with atrial remodeling and risk or presence of stroke in patients with paroxysmal atrial fibrillation. (diseaseinfosearch.org)
  • Left ventricular native T1 time and the risk of atrial fibrillation recurrence after pulmonary vein isolation in patients with paroxysmal atrial fibrillation. (diseaseinfosearch.org)
  • Abstract -Combined experimental and theoretical developments have demonstrated that in addition to preexisting electrophysiological heterogeneities, cardiac electrical restitution properties contribute to breakup of reentrant wavefronts during cardiac fibrillation. (ahajournals.org)
  • Abstract Cardiogenic stroke (CS), characteristic causes of which include atrial fibrillation (AF) and right-to-left shunting due to a patent foramen ovale (PFO), has a well-known tendency to be associated with a more extensive ischemic area. (medworm.com)
  • article{a7613a3f-4dca-4299-aa96-e2e9838aec6b, abstract = {Objective-Ventricular fibrillation (VF) is life-threatening because of its haemodynamic and metabolic effects. (lu.se)
  • In chronic atrial fibrillation (AF) left ventricular function may gradually diminish as a result of an intrinsic tachycardiomyopathy. (bmj.com)
  • Kannel WB, Abbott RD, Savage DD (1982) Epidemiologic features of chronic atrial fibrillation: the Framingham study. (springer.com)
  • We compared the effects of five pharmacologic regimens on the circadian rhythm and exercise-induced changes of ventricular rate (VR) in patients with chronic atrial fibrillation (CAF). (onlinejacc.org)
  • Other congenital heart diseases that increase VF risk include Brugada syndrome and arrhythmogenic right ventricular (RV) cardiomyopathy/dysplasia (ARVC/D). (medscape.com)
  • This is a report of a child with Brugada syndrome who experienced ventricular fibrillation storm. (biomedsearch.com)
  • El síndrome de Brugada es una entidad clínica electrocardiográfica caracterizada por la elevación del segmento ST en derivaciones precordiales derechas del electrocardiograma (ECG) y por síncope y muerte súbita, originados por episodios de arritmias ventriculares malignas, con una alta probabilidad de recurrencia. (revespcardiol.org)
  • 2010). Mode of onset of ventricular fibrillation in patients with early repolarization pattern vs Brugada syndrome. (springermedizin.de)
  • However, trials of drugs for the control of ventricular rate in patients with acute atrial fibrillation normally exclude patients with significant LVF. (bestbets.org)
  • A short-cut review was carried out to establish whether calcium channel blockers are superior to digoxin for controlling the ventricular rate in patients with acute atrial fibrillation. (bmj.com)
  • Ventricular fibrillation (VFib) may be confused with atrial fibrillation (AFib). (medicalnewstoday.com)
  • In contrast, ventricular fibrillation (VFib) has very short-lived signs and symptoms. (rxlist.com)
  • Ventricular fibrillation (VFib) is a medical condition in which the heart beats in an abnormal rhythm. (differencebetween.net)
  • Electrophysiologic Observations Concerning the Genesis of Ventricular Fibrillation. (annals.org)
  • The present research explores the genesis of ventricular fibrillation using a relatively simple three dimensional mathematical model to provide insights that would be difficult to obtain by clinical or experimental studies. (omicsonline.org)
  • This report describes the occurrence of ventricular fibrillation in two dogs while using an electrosurgical unit inside the thoracic cavity. (bva.co.uk)
  • 1 Little is known about left ventricular diastolic function in AF. (bmj.com)
  • 3 Whether the same changes in diastolic left ventricular function hold true for humans with AF remains to be investigated. (bmj.com)
  • This allowed volume measurement of early diastolic filling fraction (EDF), diastasis filling fraction (DF), and additional filling fraction (AFF) relative to the left ventricular filling volume. (bmj.com)
  • Background】Left ventricular diastolic dysfunction lead to left atrial stasis and thus increases a risk of left atrial appendage thrombus in patients with atrial fibrillation. (medworm.com)
  • We investigated whether left ventricular diastolic dysfunction is associated with embolic burden in patients with ischem ic stroke related to atrial fibrillation. (medworm.com)
  • CONCLUSION: Our study shows that in patients with preserved systolic function and persistent AF shortly after cardioversion diastolic ventricular filling patterns are altered mainly due to increased left atrial pressure and not due to impaired diastolic relaxation of left ventricle. (medsci.org)
  • In the analysis of baseline clinical and echocardiographic measures, ECV was significantly correlated with left atrial size, left ventricular mass, and abnormal diastolic function. (onlinejacc.org)
  • Left ventricular (LV) diastolic dysfunction depends on an impaired relaxation and stiffness. (diseaseinfosearch.org)
  • Although the degree of electroanatomical remodeling of the left atrium (LA) is influenced by left ventricular (LV) diastolic function, clinical implications of estimated LV filling pressure (E/Em) are limited in patients with atrial fibrillation (AF). (diseaseinfosearch.org)
  • Ventricular fibrillation is due to defective electrical impulses. (medicalnewstoday.com)
  • Ventricular fibrillation is a heart rhythm problem that occurs when the heart beats with rapid, erratic electrical impulses. (mayoclinic.org)
  • In ventricular fibrillation, rapid, erratic electrical impulses occur in the ventricles. (mayoclinic.org)
  • In ventricular fibrillation, disorganized electrical impulses in the heart's lower chambers cause the heart to stop beating (cardiac arrest). (medmovie.com)
  • Ventricular fibrillation was pause-dependent and triggered by an early-coupled right ventricular premature complex. (biomedsearch.com)
  • The right ventricular electrogram morphology changed and then accelerated with a relative fixed cycle length suggestive of VT ( Figure 2 ). (revespcardiol.org)
  • Rotor stability and meandering are key mechanisms determining and sustaining cardiac fibrillation, with important implications for anti-arrhythmic drug development. (frontiersin.org)
  • Atrial fibrillation versus ventricular fibrillation. (healthtap.com)
  • Background -Prior investigation of out-of-hospital cardiac arrest (OHCA) has raised the concern that ventricular fibrillation (VF) recurrence may be triggered by chest compression (CC) resumption. (ahajournals.org)
  • The etiology of ventricular fibrillation (VF) remains incompletely understood. (medscape.com)
  • Prophylaxis of early ventricular fibrillation by inhibition of acylcarnitine accumulation. (harvard.edu)
  • This abnormal heart rhythm is what doctors call atrial fibrillation , or AFib for short. (webmd.com)
  • During atrial fibrillation, the heart's two upper chambers (the atria) beat chaotically and irregularly - out of coordination with the two lower chambers (the ventricles) of the heart. (webmd.com)
  • Ventricular fibrillation (V-fib or VF) is an abnormal heart rhythm in which the ventricles of the heart quiver instead of pumping normally. (wikipedia.org)
  • Left untreated, ventricular fibrillation is rapidly fatal as the vital organs of the body, including the heart, are starved of oxygen, and as a result patients in this rhythm will not be conscious or responsive to stimuli. (wikipedia.org)
  • citation needed] Ventricular fibrillation has been described as "chaotic asynchronous fractionated activity of the heart" (Moe et al. (wikipedia.org)
  • Ventricular fibrillation most commonly occurs within diseased hearts, and, in the vast majority of cases, is a manifestation of underlying ischemic heart disease. (wikipedia.org)
  • Ventricular fibrillation is also seen in those with cardiomyopathy, myocarditis, and other heart pathologies. (wikipedia.org)
  • The relevance of this is that theories of the underlying pathophysiology and electrophysiology must account for the occurrence of fibrillation in the apparent "healthy" heart. (wikipedia.org)
  • PVF is defined as ventricular fibrillation not preceded by heart failure or shock, in contrast to secondary ventricular fibrillation, which is. (wikipedia.org)
  • When an impulse is delivered to the heart during the time period that corresponds to the upslope of the T wave, the ventricular myocardium is in a variable state of excitability because some of the muscle is still partly or completely refractory. (medscape.com)
  • Atrial fibrillation and ventricular fibrillation are heart conditions that include the term " fibrillation . (rxlist.com)
  • When defined as related to the heart, 'fibrillation' refers to a very rapid irregular contractions of the heart's muscle fibers. (rxlist.com)
  • One of the main differences between these two heart conditions is that ventricular fibrillation is life threatening if treatment isn't begun immediately, while atrial fibrillation generally is not immediately life threatening, but can cause problems with the heart function that are very dangerous if not treated effectively. (rxlist.com)
  • 8. The device of claim 6 further comprising means for providing antitachycardia therapy to the patient's heart if said ventricular instability is not reduced by said pacing. (google.com)
  • Ventricular fibrillation is a very fast, irregular heartbeat that is caused by abnormal firing of electrical signals in the ventricles of the heart. (medmovie.com)
  • The heart of hibernating species is resistant to lethal ventricular fibrillation (VF) induced by hypothermia. (springer.com)
  • Haber E, Letham A (1965) Splitting of heart sounds from ventricular asynchrony in bundle branch block, ventricular ectopic beats and artificial pacing. (springer.com)
  • Benjamin EJ, Wolf PA, D'Agostino RB et al (1998) Impact of atrial fibrillation on the risk of death: the Framingham Heart Study. (springer.com)
  • Stevenson WG, Stevenson LW, Middlekauff HR et al (1996) Improving survival for patients with atrial fibrillation and advanced heart failure. (springer.com)
  • Middlekauff HR, Stevenson WG, Stevenson LW (1991) Prognostic significance of atrial fibrillation in advanced heart failure. (springer.com)
  • The incidence and temperature of onset of ventricular fibrillation in 132 patients having heart surgery performed using hypothermic cardiopulmonary bypass was determined. (journals.co.za)
  • In the heart failure-group, the incidence of atrial fibrillation was significantly reduced to 5.6% in the dofetilide-treated patients (hazard ratio 0.57, 95% confidence interval 0.38-0.86). (sigmaaldrich.com)
  • In patients with left ventricular dysfunction the incidence of AF in 42 months was 9.6% in patients with heart failure and 2.9% in patients with a recent MI. (sigmaaldrich.com)
  • Dofetilide significantly reduced the risk of developing atrial fibrillation compared to placebo in the entire study group and in the subgroup of patients with heart failure. (sigmaaldrich.com)
  • Ventricular fibrillation (VF) is the primary rhythm associated with cardiac arrest characterized as rapid, disorganized contractions of the heart with complex electrocardiogram (ECG) patterns. (signavitae.com)
  • Spatio-temporal Organization During Ventricular Fibrillation in the Human Heart. (auckland.ac.nz)
  • Ventricular fibrillation is commonly associated with heart attacks or scarring of the heart muscle from previous heart attack. (drugster.info)
  • VT can progress into ventricular fibrillation or a heart attack. (healthguideinfo.com)
  • In ventricular fibrillation, the heart beats at a very fast rate that the body can't cope with. (healthguideinfo.com)
  • Unless a heart in ventricular fibrillation can be defibrillated (by applying a shock to the heart) and a normal rhythm be restored, death is inevitable. (healthguideinfo.com)
  • The risk of atrial fibrillation (AF) in patients with chronic heart failure (CHF) and preserved ejection fraction (PEF) is unclear. (onlinejacc.org)
  • Objectives We assessed the risk of adverse cardiovascular (CV) outcomes associated with atrial fibrillation (AF) in the Candesartan in Heart failure-Assessment of Reduction in Mortality and morbidity (CHARM) program, which enrolled patients with chronic heart failure (CHF) and a broad range of ejection fractions (EFs). (onlinejacc.org)
  • Ventricular fibrillation occurs most frequently in the context of heart disease (most often ischemic heart disease, but also in cardiomyopathies, myocarditis), drug overdose or serious disturbances of acid-base balance. (heartupdate.com)
  • Gibson DG, Greenbaum RA, Pridie RB, Yacoub MH (1988) Correction of left ventricular asynchrony by coronary artery surgery. (springer.com)
  • Anomalous origin of the circumflex coronary artery presenting with ventricular fibrillation cardiac arrest -- Harky et al. (bmj.com)
  • We report a case of an incidental finding of an anomalous left circumflex coronary artery arising from the right pulmonary artery that effectuated a ventricular fibrillation cardiac arrest in a woman aged 34 years. (bmj.com)
  • Sustained VF may be due to a relatively small number of macroreentrant circuits or rotors, which are relatively stationary or drift through the 3-dimensional volume of the ventricular myocardium. (medscape.com)
  • ECV is a quantitative correlate of diffuse fibrosis in the left ventricular myocardium derived from contrast-enhanced cardiac magnetic resonance. (onlinejacc.org)
  • In ventricular fibrillation myocardium does not move uniformly, rather shaking. (heartupdate.com)
  • Ventricular fibrillation, or V-fib, is considered the most serious cardiac rhythm disturbance. (heart.org)
  • Ventricular fibrillation is shown in the rhythm strip below. (medscape.com)
  • The first direct-current shocks failed to restore sinus rhythm, but rather converted ventricular fibrillation back into preexcited atrial fibrillation. (ahajournals.org)
  • A cardiac rhythm characterized by rapid, usually more than 300 bpm (cycle length: 180 ms or less), grossly irregular ventricular rhythm with marked variability in qrs cycle length, morphology, and amplitude. (icd10data.com)
  • Atrial fibrillation is a rhythm you can live with. (healthtap.com)
  • Ventricular fibrillation is a rhythm you die with unless it is corrected quickly. (healthtap.com)
  • It has been known that with the onset of atrial fibrillation the mean ventricular rate over 24 h is substantially higher than that during sinus rhythm in the same patient during atrial fibrillation. (onlinejacc.org)
  • These changes cause the nonrandom patterns of ventricular rhythm in the horse. (uu.nl)
  • Because such very long RR intervals do not occur in human beings or dogs during atrial fibrillation, the random ventricular rhythm in these groups is maintained even during digitalis treatment. (uu.nl)
  • Ventricular fibrillation is a very serious disorder of the heart's normal rhythm (which often puts vital issues). (heartupdate.com)
  • 1) initiation of a premature systole and a series of re-entrant waves, and (2) the factors engendering their transformation into fibrillation. (annals.org)
  • Fibrillation is preceded by one or more ventricular premature systoles with a slow rate of depolarization and incomplete propagation. (annals.org)
  • Intracardiac electrograms recorded by the implantable cardioverter defibrillator in two of the ventricular fibrillation episodes and text of the episodes with RR interval measurements in ms. Both disclose a premature ventricular beat of the same morphology and coupling (*) with respect to the preceding sinus beat that initiated ventricular fibrillation. (revespcardiol.org)
  • The first episode shows two preceding premature beats of the same morphology and similar coupling that did not initiate ventricular fibrillation. (revespcardiol.org)
  • All episodes were started by a premature ventricular beat of the same morphology and coupling interval. (revespcardiol.org)
  • When the atria, the two upper chambers, contract at an excessively high rate, and in an irregular way, the patient has atrial fibrillation (AFib). (medicalnewstoday.com)
  • The right side of these strips show the ultrarapid and irregular, patternless beats that characterize ventricular fibrillation. (merckmanuals.com)
  • We examined the incidence of new-onset atrial fibrillation in patients with left ventricular dysfunction. (sigmaaldrich.com)
  • New-onset AF has an incidence of approximately 40% at 2 years in post-infarction patients with left ventricular dysfunction, usually is asymptomatic, and is associated with major cardiovascular events when the duration of episodes is ≥30 seconds. (acc.org)
  • A 54-year-old man with new-onset ventricular fibrillation. (physiciansweekly.com)
  • Cardiac magnetic resonance (CMR) and 18F-2-fluoro-2-deoxyglucose positron emission tomography (FDG-PET) images were shown (figure 1).heartjnl;heartjnl-2017-312052v1/F1F1F1Figure 1Cardiac magnetic resonance with a T1-weighted inversion recovery image (A) and 18F-2-fluoro-2-deoxyglucose positron emission tomography (B) in a 54-year-old man with new-onset ventricular fibrillation. (physiciansweekly.com)
  • Specialists believe there are a number of pathophysiological and electrophysiological changes that ultimately lead to onset of ventricular fibrillation. (heartupdate.com)
  • Of note, multivariate analysis revealed that VF occurrence was also associated with atrial fibrillation demonstrated on the first ECG. (freecme.com)
  • Abnormal rapid stimulation of the ventricles can lead to fibrillation. (medscape.com)
  • Abnormal LV relaxation contributes to the development of atrial fibrillation (AF), but the role of LV stiffness in AF remains unclear. (diseaseinfosearch.org)
  • Methods: The fully three dimensional model of right and left ventricular muscle was used to simulate the spread of electrical activation and the resulting electrocardiogram. (omicsonline.org)
  • The incidence rate of in-hospital ventricular fibrillation was 3.2%, 79% of which was early VF. (freecme.com)
  • Ventricular fibrillation is a relatively common disease in the European population (especially in the Nordic countries) and annual incidence of mortality it is 6 to 10,000 cases of cardiac death. (heartupdate.com)
  • There are two peaks of incidence of ventricular fibrillation: in the first 6 months of life and between 55-75 years. (heartupdate.com)
  • A public-use defibrillator is programmed to detect ventricular fibrillation and emit a shock at the right moment. (medicalnewstoday.com)
  • B , Ventricular fibrillation converting back to preexcited atrial fibrillation after a DC shock. (ahajournals.org)
  • Hence, the ICD shock itself and not ventricular fibrillation seems to cause myocardial micro-damage. (uni-muenchen.de)
  • Note - Ventricular fibrillation stops blood circulation. (iec.ch)
  • Note - La fibrillation ventriculaire entraîne l'arrêt de la circulation sanguine. (iec.ch)
  • Instead a model of abrupt transition to chaos emerges from the application of first-principles cardiac electrophysiology, realistic ventricular anatomy, and the pathophysiology of ischemic cardiac muscle. (omicsonline.org)