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.
Large endothelium-lined venous channels situated between the two layers of DURA MATER, the endosteal and the meningeal layers. They are devoid of valves and are parts of the venous system of dura mater. Major cranial sinuses include a postero-superior group (such as superior sagittal, inferior sagittal, straight, transverse, and occipital) and an antero-inferior group (such as cavernous, petrosal, and basilar plexus).
The air space located in the body of the MAXILLARY BONE near each cheek. Each maxillary sinus communicates with the middle passage (meatus) of the NASAL CAVITY on the same side.
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.
Air-filled spaces located within the bones around the NASAL CAVITY. They are extensions of the nasal cavity and lined by the ciliated NASAL MUCOSA. Each sinus is named for the cranial bone in which it is located, such as the ETHMOID SINUS; the FRONTAL SINUS; the MAXILLARY SINUS; and the SPHENOID SINUS.
The dilatation of the aortic wall behind each of the cusps of the aortic valve.
An irregularly shaped venous space in the dura mater at either side of the sphenoid bone.
The dilated portion of the common carotid artery at its bifurcation into external and internal carotids. It contains baroreceptors which, when stimulated, cause slowing of the heart, vasodilatation, and a fall in blood pressure.
One of the paired, but seldom symmetrical, air spaces located between the inner and outer compact layers of the FRONTAL BONE in the forehead.
Diseases affecting or involving the PARANASAL SINUSES and generally manifesting as inflammation, abscesses, cysts, or tumors.
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.
One of the paired air spaces located in the body of the SPHENOID BONE behind the ETHMOID BONE in the middle of the skull. Sphenoid sinus communicates with the posterosuperior part of NASAL CAVITY on the same side.
A short vein that collects about two thirds of the venous blood from the MYOCARDIUM and drains into the RIGHT ATRIUM. Coronary sinus, normally located between the LEFT ATRIUM and LEFT VENTRICLE on the posterior surface of the heart, can serve as an anatomical reference for cardiac procedures.
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).
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.
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.
Formation or presence of a blood clot (THROMBUS) in the CRANIAL SINUSES, large endothelium-lined venous channels situated within the SKULL. Intracranial sinuses, also called cranial venous sinuses, include the superior sagittal, cavernous, lateral, petrous sinuses, and many others. Cranial sinus thrombosis can lead to severe HEADACHE; SEIZURE; and other neurological defects.
The numerous (6-12) small thin-walled spaces or air cells in the ETHMOID BONE located between the eyes. These air cells form an ethmoidal labyrinth.
Simple rapid heartbeats caused by rapid discharge of impulses from the SINOATRIAL NODE, usually between 100 and 180 beats/min in adults. It is characterized by a gradual onset and termination. Sinus tachycardia is common in infants, young children, and adults during strenuous physical activities.
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.
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.
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.
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.
Tumors or cancer of the PARANASAL SINUSES.
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.
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.
The number of times the HEART VENTRICLES contract per unit of time, usually per minute.
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.
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.
Regulation of the rate of contraction of the heart muscles by an artificial pacemaker.
Tumors or cancer of the MAXILLARY SINUS. They represent the majority of paranasal neoplasms.
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).
A generic expression for any tachycardia that originates above the BUNDLE OF HIS.
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)
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 chambers of the heart, to which the BLOOD returns from the circulation.
The small mass of modified cardiac muscle fibers located at the junction of the superior vena cava (VENA CAVA, SUPERIOR) and right atrium. Contraction impulses probably start in this node, spread over the atrium (HEART ATRIUM) and are then transmitted by the atrioventricular bundle (BUNDLE OF HIS) to the ventricle (HEART VENTRICLE).
A hair-containing cyst or sinus, occurring chiefly in the coccygeal region.
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.
The hollow, muscular organ that maintains the circulation of the blood.
An electrical current applied to the HEART to terminate a disturbance of its rhythm, ARRHYTHMIAS, CARDIAC. (Stedman, 25th ed)
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.
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.
The two large endothelium-lined venous channels that begin at the internal occipital protuberance at the back and lower part of the CRANIUM and travels laterally and forward ending in the internal jugular vein (JUGULAR VEINS). One of the transverse sinuses, usually the right one, is the continuation of the SUPERIOR SAGITTAL SINUS. The other transverse sinus is the continuation of the straight sinus.
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)
Methods to induce and measure electrical activities at specific sites in the heart to diagnose and treat problems with the heart's electrical system.
The long large endothelium-lined venous channel on the top outer surface of the brain. It receives blood from a vein in the nasal cavity, runs backwards, and gradually increases in size as blood drains from veins of the brain and the DURA MATER. Near the lower back of the CRANIUM, the superior sagittal sinus deviates to one side (usually the right) and continues on as one of the TRANSVERSE SINUSES.
A potent anti-arrhythmia agent, effective in a wide range of ventricular and atrial ARRHYTHMIAS and TACHYCARDIAS.
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.
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).
Abrupt changes in the membrane potential that sweep along the CELL MEMBRANE of excitable cells in response to excitation stimuli.
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.
A condition in which HEART VENTRICLES exhibit impaired function.
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.
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.
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)
Elements of limited time intervals, contributing to particular results or situations.
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.
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.
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.
Striated muscle cells found in the heart. They are derived from cardiac myoblasts (MYOBLASTS, CARDIAC).
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.
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.
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.
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).
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.
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.
The omission of atrial activation that is caused by transient cessation of impulse generation at the SINOATRIAL NODE. It is characterized by a prolonged pause without P wave in an ELECTROCARDIOGRAM. Sinus arrest has been associated with sleep apnea (REM SLEEP-RELATED SINUS ARREST).
An antiarrhythmia agent that is particularly effective in ventricular arrhythmias. It also has weak beta-blocking activity.
Veins draining the cerebrum.
NECROSIS of the MYOCARDIUM caused by an obstruction of the blood supply to the heart (CORONARY CIRCULATION).
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.
The abrupt cessation of all vital bodily functions, manifested by the permanent loss of total cerebral, respiratory, and cardiovascular functions.
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.
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.
Impaired impulse conduction from HEART ATRIA to HEART VENTRICLES. AV block can mean delayed or completely blocked impulse conduction.
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.
Optical imaging techniques used for recording patterns of electrical activity in tissues by monitoring transmembrane potentials via FLUORESCENCE imaging with voltage-sensitive fluorescent dyes.
A class Ia antiarrhythmic drug that is structurally-related to PROCAINE.
The veins that return the oxygenated blood from the lungs to the left atrium of the heart.
A family of voltage-gated potassium channels that are characterized by long N-terminal and C-terminal intracellular tails. They are named from the Drosophila protein whose mutation causes abnormal leg shaking under ether anesthesia. Their activation kinetics are dependent on extracellular MAGNESIUM and PROTON concentration.
One of the ANTI-ARRHYTHMIA AGENTS, it blocks VOLTAGE-GATED SODIUM CHANNELS and slows conduction within the His-Purkinje system and MYOCARDIUM.
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)
Ultrasonic recording of the size, motion, and composition of the heart and surrounding tissues. The standard approach is transthoracic.
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.
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).
The study of the electrical activity and characteristics of the HEART; MYOCARDIUM; and CARDIOMYOCYTES.
An adrenergic beta-antagonist that is used in the treatment of life-threatening arrhythmias.
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.
The hemodynamic and electrophysiological action of the HEART ATRIA.
Sampling of blood levels of the adrenocorticotropic hormone (ACTH) by withdrawal of blood from the inferior petrosal sinus. The inferior petrosal sinus arises from the cavernous sinus and runs to the internal jugular vein. Sampling of blood at this level is a valuable tool in the differential diagnosis of Cushing disease, Cushing syndrome, and other adrenocortical diseases.
Abnormally rapid heartbeats with sudden onset and cessation.
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.
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.
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).
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.
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.
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.
PRESSURE of the BLOOD on the ARTERIES and other BLOOD VESSELS.
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.
Formation or presence of a blood clot (THROMBUS) in the LATERAL SINUSES. This condition is often associated with ear infections (OTITIS MEDIA or MASTOIDITIS) without antibiotic treatment. In developed nations, lateral sinus thrombosis can result from CRANIOCEREBRAL TRAUMA; BRAIN NEOPLASMS; NEUROSURGICAL PROCEDURES; THROMBOPHILIA; and other conditions. Clinical features include HEADACHE; VERTIGO; and increased intracranial pressure.
The return of a sign, symptom, or disease after a remission.
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.
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.
Small band of specialized CARDIAC MUSCLE fibers that originates in the ATRIOVENTRICULAR NODE and extends into the membranous part of the interventricular septum. The bundle of His, consisting of the left and the right bundle branches, conducts the electrical impulses to the HEART VENTRICLES in generation of MYOCARDIAL CONTRACTION.
Contractile activity of the MYOCARDIUM.
Pathological conditions involving the HEART including its structural and functional abnormalities.
A combination of congenital heart defects consisting of four key features including VENTRICULAR SEPTAL DEFECTS; PULMONARY STENOSIS; RIGHT VENTRICULAR HYPERTROPHY; and a dextro-positioned AORTA. In this condition, blood from both ventricles (oxygen-rich and oxygen-poor) is pumped into the body often causing CYANOSIS.
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.
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.
Inflammation of the NASAL MUCOSA in the MAXILLARY SINUS. In many cases, it is caused by an infection of the bacteria HAEMOPHILUS INFLUENZAE; STREPTOCOCCUS PNEUMONIAE; or STAPHYLOCOCCUS AUREUS.
Disturbance in the atrial activation that is caused by transient failure of impulse conduction from the SINOATRIAL NODE to the HEART ATRIA. It is characterized by a delayed in heartbeat and pauses between P waves in an ELECTROCARDIOGRAM.
Benign, non-Langerhans-cell, histiocytic proliferative disorder that primarily affects the lymph nodes. It is often referred to as sinus histiocytosis with massive lymphadenopathy.
Abnormally rapid heartbeats caused by reentry of atrial impulse into the dual (fast and slow) pathways of ATRIOVENTRICULAR NODE. The common type involves a blocked atrial impulse in the slow pathway which reenters the fast pathway in a retrograde direction and simultaneously conducts to the atria and the ventricles leading to rapid HEART RATE of 150-250 beats per minute.
The innermost layer of the heart, comprised of endothelial cells.
The hemodynamic and electrophysiological action of the HEART VENTRICLES.
Antiarrhythmic agent pharmacologically similar to LIDOCAINE. It may have some anticonvulsant properties.
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.
A form of CARDIAC MUSCLE disease that is characterized by ventricular dilation, VENTRICULAR DYSFUNCTION, and HEART FAILURE. Risk factors include SMOKING; ALCOHOL DRINKING; HYPERTENSION; INFECTION; PREGNANCY; and mutations in the LMNA gene encoding LAMIN TYPE A, a NUCLEAR LAMINA protein.
Tomography using x-ray transmission and a computer algorithm to reconstruct the image.
The movement and the forces involved in the movement of the blood through the CARDIOVASCULAR SYSTEM.
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.
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.
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.
Computer-assisted processing of electric, ultrasonic, or electronic signals to interpret function and activity.
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.
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.
Potassium channel whose permeability to ions is extremely sensitive to the transmembrane potential difference. The opening of these channels is induced by the membrane depolarization of the ACTION POTENTIAL.
Receptors in the vascular system, particularly the aorta and carotid sinus, which are sensitive to stretch of the vessel walls.
Procedures of applying ENDOSCOPES for disease diagnosis and treatment. Endoscopy involves passing an optical instrument through a small incision in the skin i.e., percutaneous; or through a natural orifice and along natural body pathways such as the digestive tract; and/or through an incision in the wall of a tubular structure or organ, i.e. transluminal, to examine or perform surgery on the interior parts of the body.
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.
The outermost of the three MENINGES, a fibrous membrane of connective tissue that covers the brain and the spinal cord.
An acquired or spontaneous abnormality in which there is communication between CAVERNOUS SINUS, a venous structure, and the CAROTID ARTERIES. It is often associated with HEAD TRAUMA, specifically basilar skull fractures (SKULL FRACTURE, BASILAR). Clinical signs often include VISION DISORDERS and INTRACRANIAL HYPERTENSION.
Surgery performed on the heart.
The veins and arteries of the HEART.
A retention cyst of the salivary gland, lacrimal sac, paranasal sinuses, appendix, or gallbladder. (Stedman, 26th ed)
Surgery performed on the ear and its parts, the nose and nasal cavity, or the throat, including surgery of the adenoids, tonsils, pharynx, and trachea.
A voltage-gated potassium channel that is expressed primarily in the HEART.
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.
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.
Developmental abnormalities involving structures of the heart. These defects are present at birth but may be discovered later in life.
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.
Modified cardiac muscle fibers composing the terminal portion of the heart conduction system.
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.
Malformations of CORONARY VESSELS, either arteries or veins. Included are anomalous origins of coronary arteries; ARTERIOVENOUS FISTULA; CORONARY ANEURYSM; MYOCARDIAL BRIDGING; and others.
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 paravertebral sympathetic ganglion formed by the fusion of the inferior cervical and first thoracic ganglia.
Cell membrane glycoproteins that are selectively permeable to potassium ions. At least eight major groups of K channels exist and they are made up of dozens of different subunits.
An antiarrhythmia agent used primarily for ventricular rhythm disturbances.
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.
Rare vascular anomaly involving a communication between the intracranial and extracranial venous circulation via diploe, the central spongy layer of cranial bone. It is often characterized by dilated venous structures on the scalp due to abnormal drainage from the intracranial venous sinuses. Sinus pericranii can be congenital or traumatic in origin.
The thoracolumbar division of the autonomic nervous system. Sympathetic preganglionic fibers originate in neurons of the intermediolateral column of the spinal cord and project to the paravertebral and prevertebral ganglia, which in turn project to target organs. The sympathetic nervous system mediates the body's response to stressful situations, i.e., the fight or flight reactions. It often acts reciprocally to the parasympathetic system.
Procedures in which placement of CARDIAC CATHETERS is performed for therapeutic or diagnostic procedures.
Treatment process involving the injection of fluid into an organ or tissue.
Agents that have a strengthening effect on the heart or that can increase cardiac output. They may be CARDIAC GLYCOSIDES; SYMPATHOMIMETICS; or other drugs. They are used after MYOCARDIAL INFARCT; CARDIAC SURGICAL PROCEDURES; in SHOCK; or in congestive heart failure (HEART FAILURE).
Inflammation of the NASAL MUCOSA, the mucous membrane lining the NASAL CAVITIES.
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.
Compounds based on N-phenylacetamide, that are similar in structure to 2-PHENYLACETAMIDES. They are precursors of many other compounds. They were formerly used as ANALGESICS and ANTIPYRETICS, but often caused lethal METHEMOGLOBINEMIA.
The act of breathing with the LUNGS, consisting of INHALATION, or the taking into the lungs of the ambient air, and of EXHALATION, or the expelling of the modified air which contains more CARBON DIOXIDE than the air taken in (Blakiston's Gould Medical Dictionary, 4th ed.). This does not include tissue respiration (= OXYGEN CONSUMPTION) or cell respiration (= CELL RESPIRATION).
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 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.
A nonflammable, halogenated, hydrocarbon anesthetic that provides relatively rapid induction with little or no excitement. Analgesia may not be adequate. NITROUS OXIDE is often given concomitantly. Because halothane may not produce sufficient muscle relaxation, supplemental neuromuscular blocking agents may be required. (From AMA Drug Evaluations Annual, 1994, p178)
Antimuscarinic quaternary ammonium derivative of scopolamine used to treat cramps in gastrointestinal, urinary, uterine, and biliary tracts, and to facilitate radiologic visualization of the gastrointestinal tract.
A genus of toxic herbaceous Eurasian plants of the Plantaginaceae which yield cardiotonic DIGITALIS GLYCOSIDES. The most useful species are Digitalis lanata and D. purpurea.
Congenital, inherited, or acquired abnormalities involving ARTERIES; VEINS; or venous sinuses in the BRAIN; SPINAL CORD; and MENINGES.
Controlled physical activity which is performed in order to allow assessment of physiological functions, particularly cardiovascular and pulmonary, but also aerobic capacity. Maximal (most intense) exercise is usually required but submaximal exercise is also used.
A tetrameric calcium release channel in the SARCOPLASMIC RETICULUM membrane of SMOOTH MUSCLE CELLS, acting oppositely to SARCOPLASMIC RETICULUM CALCIUM-TRANSPORTING ATPASES. It is important in skeletal and cardiac excitation-contraction coupling and studied by using RYANODINE. Abnormalities are implicated in CARDIAC ARRHYTHMIAS and MUSCULAR DISEASES.
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)
Ear-shaped appendage of either atrium of the heart. (Dorland, 28th ed)
The venous trunk which returns blood from the head, neck, upper extremities and chest.
Use of electric potential or currents to elicit biological responses.
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.
A class Ib anti-arrhythmia agent used to manage ventricular and supraventricular arrhythmias.
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)
This structure includes the thin muscular atrial septum between the two HEART ATRIA, and the thick muscular ventricular septum between the two HEART VENTRICLES.
Non-invasive method of demonstrating internal anatomy based on the principle that atomic nuclei in a strong magnetic field absorb pulses of radiofrequency energy and emit them as radiowaves which can be reconstructed into computerized images. The concept includes proton spin tomographic techniques.
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)
A characteristic symptom complex.
The circulation of blood through the CORONARY VESSELS of the HEART.
A rare form of supraventricular tachycardia caused by automatic, not reentrant, conduction initiated from sites at the atrioventricular junction, but not the ATRIOVENTRICULAR NODE. It usually occurs during myocardial infarction, after heart surgery, or in digitalis intoxication with a HEART RATE ranging from 140 to 250 beats per minute.
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.
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.
A calcium channel blocker that is a class IV anti-arrhythmia agent.
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)
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 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).
The hemodynamic and electrophysiological action of the RIGHT ATRIUM.
The craniosacral division of the autonomic nervous system. The cell bodies of the parasympathetic preganglionic fibers are in brain stem nuclei and in the sacral spinal cord. They synapse in cranial autonomic ganglia or in terminal ganglia near target organs. The parasympathetic nervous system generally acts to conserve resources and restore homeostasis, often with effects reciprocal to the sympathetic nervous system.
An element in the alkali group of metals with an atomic symbol K, atomic number 19, and atomic weight 39.10. It is the chief cation in the intracellular fluid of muscle and other cells. Potassium ion is a strong electrolyte that plays a significant role in the regulation of fluid volume and maintenance of the WATER-ELECTROLYTE BALANCE.
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.
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.
A form of inherited long QT syndrome (or LQT7) that is characterized by a triad of potassium-sensitive periodic paralysis, VENTRICULAR ECTOPIC BEATS, and abnormal features such as short stature, low-set ears, and SCOLIOSIS. It results from mutations of KCNJ2 gene which encodes a channel protein (INWARD RECTIFIER POTASSIUM CHANNELS) that regulates resting membrane potential.
Focal accumulations of EDEMA fluid in the NASAL MUCOSA accompanied by HYPERPLASIA of the associated submucosal connective tissue. Polyps may be NEOPLASMS, foci of INFLAMMATION, degenerative lesions, or malformations.
Connections between cells which allow passage of small molecules and electric current. Gap junctions were first described anatomically as regions of close apposition between cells with a narrow (1-2 nm) gap between cell membranes. The variety in the properties of gap junctions is reflected in the number of CONNEXINS, the family of proteins which form the junctions.
A general class of ortho-dihydroxyphenylalkylamines derived from tyrosine.
Developmental abnormalities in any portion of the ATRIAL SEPTUM resulting in abnormal communications between the two upper chambers of the heart. Classification of atrial septal defects is based on location of the communication and types of incomplete fusion of atrial septa with the ENDOCARDIAL CUSHIONS in the fetal heart. They include ostium primum, ostium secundum, sinus venosus, and coronary sinus defects.
Signal transduction mechanisms whereby calcium mobilization (from outside the cell or from intracellular storage pools) to the cytoplasm is triggered by external stimuli. Calcium signals are often seen to propagate as waves, oscillations, spikes, sparks, or puffs. The calcium acts as an intracellular messenger by activating calcium-responsive proteins.
A basic element found in nearly all organized tissues. It is a member of the alkaline earth family of metals with the atomic symbol Ca, atomic number 20, and atomic weight 40. Calcium is the most abundant mineral in the body and combines with phosphorus to form calcium phosphate in the bones and teeth. It is essential for the normal functioning of nerves and muscles and plays a role in blood coagulation (as factor IV) and in many enzymatic processes.
An electrophysiologic technique for studying cells, cell membranes, and occasionally isolated organelles. All patch-clamp methods rely on a very high-resistance seal between a micropipette and a membrane; the seal is usually attained by gentle suction. The four most common variants include on-cell patch, inside-out patch, outside-out patch, and whole-cell clamp. Patch-clamp methods are commonly used to voltage clamp, that is control the voltage across the membrane and measure current flow, but current-clamp methods, in which the current is controlled and the voltage is measured, are also used.
A class of drugs that act by inhibition of potassium efflux through cell membranes. Blockade of potassium channels prolongs the duration of ACTION POTENTIALS. They are used as ANTI-ARRHYTHMIA AGENTS and VASODILATOR AGENTS.
A light and spongy (pneumatized) bone that lies between the orbital part of FRONTAL BONE and the anterior of SPHENOID BONE. Ethmoid bone separates the ORBIT from the ETHMOID SINUS. It consists of a horizontal plate, a perpendicular plate, and two lateral labyrinths.

Relation between mode of pacing and long-term survival in the very elderly. (1/245)

OBJECTIVES: This study analyzes the relationship between pacing mode and long-term survival in a large group of very elderly patients (> or = 80 years old). BACKGROUND: The relationship between pacing mode and long-term survival is not clear. Because the number of very elderly who are candidates for pacing is increasing, issues related to pacemaker (PM) use in the elderly have important clinical and economic implications. METHODS: We retrospectively reviewed 432 patients (mean age, 84.5+/-3.9 years) who received their initial PM (ventricular in 310 and dual chamber in 122) between 1980 and 1992. Follow-up was complete (3.5+/-2.6 years). Observed survival was estimated by the Kaplan-Meier method. Age- and gender-matched cohorts from the Minnesota population were used for expected survival. Log-rank test and Cox regression hazard model were used for univariate and multivariate analyses. RESULTS: Patients with ventricular PMs appeared to have poor overall survival compared with those with dual-chamber PMs. Observed survival after PM implantation in high grade atrioventricular block (AVB) patients was significantly worse than expected survival of the age- and gender-matched population (p < 0.0001), whereas observed survival of patients with sinus node dysfunction was not significantly different from expected survival of the matched population (p = 0.413). By univariate analysis, ventricular pacing in patients with AVB appeared to be associated with poor survival compared with dual-chamber pacing (hazard ratio [HR] 2.08; 95% confidence interval [CI] 1.33 to 3.33). After multivariate analysis, this difference was no longer significant (HR 1.41; 95% CI 0.88 to 2.27). Independent predictors of all-cause mortality were number of comorbid illnesses, New York Heart Association functional class, left ventricular depression and older age at implant. Pacing mode was not an independent predictor of overall survival. Older age at implantation, diabetes mellitus, dementia, history of paroxysmal atrial fibrillation and earlier year of implantation were independent predictors of ventricular pacemaker selection. CONCLUSIONS: After PM implantation, long-term survival among very elderly patients was not affected by pacing mode after correction of baseline differences. Selection bias was present in pacing mode in the very elderly, with ventricular pacing selected for sicker and older patients, perhaps partly explaining the apparent "beneficial impact on survival" observed with dual-chamber pacing.  (+info)

Development of sinus node disease in patients with AV block: implications for single lead VDD pacing. (2/245)

OBJECTIVE: To investigate the incidence of sinus node disease after pacemaker implantation for exclusive atrioventricular (AV) block. DESIGN: 441 patients were followed after VDD (n = 219) or DDD pacemaker (n = 222) implantation for AV block over a mean period of 37 months. Sinus node disease and atrial arrhythmias had been excluded by Holter monitoring and treadmill exercise preoperatively in 286 patients (group A). In 155 patients with complete AV block, a sinus rate above 70 beats/min was required for inclusion in the study (group B). Holter monitoring and treadmill exercise were performed two weeks, three months, and every six months after implantation. Sinus bradycardia below 40 beats/min, sinoatrial block, sinus arrest, or subnormal increase of heart rate during treadmill exercise were defined as sinus node dysfunction. RESULTS: Cumulative incidence of sinus node disease was 0.65% per year without differences between groups. Clinical indicators of sinus node dysfunction were sinus bradycardia below 40 beats/min in six patients (1.4%), intermittent sinoatrial block in two (0.5%), and chronotropic incompetence in five patients (1.1%). Only one of these patients (0.2%) was symptomatic. Cumulative incidence of atrial fibrillation was 2.0% per year, independent of the method used for the assessment of sinus node function and of the implanted device. CONCLUSIONS: In patients undergoing pacemaker implantation for isolated AV block, sinus node syndrome rarely occurs during follow up. Thus single lead VDD pacing can safely be performed in these patients.  (+info)

Cardiocirculatory coupling during sinusoidal baroreceptor stimulation and fixed-frequency breathing. (3/245)

The question of whether respiratory sinus arrhythmia (RSA) originates mainly from a central coupling between respiration and heart rate, or from baroreflex mechanisms, is a subject of controversy. If there is a major contribution of baroreflexes to RSA, cardiocirculatory coupling during breathing and during cyclic baroreflex stimulation should show similarities. We applied a sinusoidal stimulus to the carotid baroreceptors and generated heart rate fluctuations of the same magnitude as RSA with a frequency similar to, but different from, the breathing frequency (0.2 Hz, compared with 0.25 Hz), and at 0.1 Hz, in 17 supine healthy subjects (age 28-39 years). The data were analysed using discrete Fourier-transform and transfer function analysis. Respiratory fluctuations in systolic blood pressure preceded RSA with a time lag equal to that between baroreceptor stimulation and oscillations in RR interval (0.62+/-0.18 s compared with 0.57+/-0.28 s at 0.2 Hz neck suction). The response of systolic blood pressure to neck suction at 0.2 Hz was 5 times less than the respiratory blood pressure fluctuations. Neck suction at 0.1 Hz largely increased fluctuations in blood pressure and RR interval, whereas the spontaneous phase relationship between blood pressure and RR interval remained unchanged. Our results are not consistent with the hypothesis that the origin of RSA is predominantly a central phenomenon which secondarily generates fluctuations in blood pressure, but suggest that, under the condition of fixed-frequency breathing at 0.25 Hz, baroreflex mechanisms contribute to respiratory fluctuations in RR interval.  (+info)

Impact of acute hypoxia on heart rate and blood pressure variability in conscious dogs. (4/245)

To examine whether the impacts of hypoxia on autonomic regulations involve the phasic modulations as well as tonic controls of cardiovascular variables, heart rate, blood pressure, and their variability during isocapnic progressive hypoxia were analyzed in trained conscious dogs prepared with a permanent tracheostomy and an implanted blood pressure telemetry unit. Data were obtained at baseline and when minute ventilation (VI) first reached 10 (VI10), 15 (VI15), and 20 (VI20) l/min during hypoxia. Time-dependent changes in the amplitudes of the high-frequency component of the R-R interval (RRIHF) and the low-frequency component of mean arterial pressure (MAPLF) were analyzed by complex demodulation. In a total of 47 progressive hypoxic runs in three dogs, RRIHF decreased at VI15 and VI20 and MAPLF increased at VI10 and VI15 but not at VI20, whereas heart rate and arterial pressure increased progressively with advancing hypoxia. We conclude that the autonomic responses to isocapnic progressive hypoxia involve tonic controls and phasic modulations of cardiovascular variables; the latter may be characterized by a progressive reduction in respiratory vagal modulation of heart rate and a transient augmentation in low-frequency sympathetic modulation of blood pressure.  (+info)

Mechanisms of respiratory sinus arrhythmia in patients with mild heart failure. (5/245)

The high-frequency (HF) component of the heart rate variability (HRV) is regarded as an index of cardiac vagal responsiveness. However, when vagal tone is decreased, nonneural mechanisms could account for a significant proportion of the HF component. To test this hypothesis, we examined the HRV spectral power in 20 patients with mild chronic heart failure (CHF) and 11 controls before and during ganglion blockade with trimethaphan camsylate (3-6 mg/min iv). A small HF component was still present during ganglion blockade, and its amplitude did not differ between CHF patients and controls. The average contribution of nonneural oscillations to the HF component was 15% (range 1-77%) in patients with CHF and 3% (range 0. 7-30%) in healthy controls (P < 0.005). During controlled breathing at 0.16 Hz, however, it decreased to 1% (range 0.2-13%) in healthy controls and 5% (range 1-44%) in CHF patients. Our results indicate that the HF component can significantly overestimate cardiac vagal responsiveness in patients with mild CHF. This bias is improved by controlled breathing, since this maneuver increases the vagal contribution to HF without affecting its nonneural component.  (+info)

Bipolar atrial sensing thresholds in sinus rhythm and atrial tachyarrhythmias. A comparative analysis in patients with DDDR pacemakers. (6/245)

Automatic mode switching (AMS) function in dual chamber pacemakers depends on adequate detection of atrial tachyarrhythmias. There are few data on showing how intra-operative atrial signal amplititude during sinus rhythm can predict atrial tachyarrhythmias after pacemaker implantation. In 43 patients undergoing DDDR pacemaker implantation and atrioventricular nodal ablation for the treatment of drug-refractory paroxysmal atrial fibrillation, atrial sensing thresholds during sinus rhythm and during induced atrial tachyarrhythmias (24-48 h after device implantation) were analysed. Five different DDDR pacemaker systems were implanted (Chorus 7034, Ela Medical n = 13; Meta DDDR 1254, Telectronics Pacing Systems n = 12; Vigor DR 1230, Guidant n = 6; Trilogy DR 2364, Pacesetter, n = 2; Kappa DR 401, Medtronic USA n = 10). Every patient received a steroid-eluting, screwing, bipolar atrial lead (Medtronic, Capsure-Fix 4068). The mean P wave amplitude during implantation was 3.91 +/- 1.14 mV. The mean atrial sensing threshold during sinus rhythm and during all modes of induced atrial tachyarrhythmias was 3.35 +/- 1.0 mV, and 1.52 +/- 0.92 mV, respectively (P < 0.001). Atrial fibrillation was induced in 36 patients. The mean sensing threshold during sinus rhythm in this patient group was 3.39 +/- 1.01 mV, the mean sensing threshold during atrial fibrillation was 1.27 +/- 0.56 mV, reflecting a 63% reduction of sensing threshold compared with sinus rhythm (P < 0.001). Atrial flutter was induced in seven patients. The mean sensing threshold during sinus rhythm was 2.92 +/- 1.19 mV, the mean sensing threshold during atrial flutter was 2.79 +/- 1.26 mV, reflecting a reduction of 5% (ns) compared with sinus rhythm. Atrial sensing thresholds during sinus rhythm were significantly correlated with sensing thresholds during atrial tachyarrhythmias (r = 0.44; P < 0.002), but there were significant variations in intra-individual results. The reduction of atrial sensing thresholds between sinus rhythm and induced atrial tachyarrhythmias ranged from 30% to 82%. CONCLUSION: Bipolar atrial sensing thresholds during sinus rhythm are correlated with sensing thresholds during atrial tachyarrhythmias, but there is a large degree of variance in individual patients. A 4:1 to 5:1 atrial sensing safety margin based on sensing threshold during sinus rhythm is a predictor for adequate postoperative detection of atrial tachyarrhythmias and the function of AMS devices.  (+info)

Sinus node recovery time in the elderly. (7/245)

Measurement of the sinus node recovery time has been proposed as a diagnostic tool for recognition of the sick sinus syndrome. The latter is most frequently encountered in elderly patients with hypertension, coronary heart disease, and atherosclerosis. In order to provide normal values for the sinus node recovery time in this particular population group, atrial pacing studies were carried out in 30 subjects over 50 years of age, all with peripheral vascular disease and some with angina pectoris (10), residua of infarction (6), or hypertension (7). On stimulation, 7 patients maintained a I:I atrioventricular conduction up to the rate of 180/min. Second degree atrioventricular block developed in all other cases. On six occasions, Wenckebach's periods appeared at the relatively slow pacing rate of 120/min. The maximum postoverdrive pause ranged from 680 to 1600 ms with an average of 1100 ms plus or minus 190 (10). For each pacing speed, a correlation was found between the duration of the pause and the control intrinsic cardiac rate, longer pauses being associated with longer resting PP intervals. Beyond 120/min, the duration of the pause was seen to shorten progressively as the driving rate was increased. Finally, the behavior of the sinus node pacemaker following interruption of pacing showed individual variations. After pacing at relatively slow rates, a prompt return to near control values was consistently observed, whereas, after fast rates of driving, a phase of secondary depression developed in about one-half of the studied cases.  (+info)

Abnormalities of hemorheological, endothelial, and platelet function in patients with chronic heart failure in sinus rhythm: effects of angiotensin-converting enzyme inhibitor and beta-blocker therapy. (8/245)

BACKGROUND: To investigate the hypothesis that abnormalities of hemorheological (fibrinogen, plasma viscosity), endothelial (von Willebrand factor [vWF]), and platelet (soluble P-selectin) function would exist in patients with chronic heart failure (CHF) who are in sinus rhythm, we conducted a cross-sectional study of 120 patients with stable CHF (median ejection fraction 30%). We also hypothesized that ACE inhibitors and beta-blockers would beneficially affect the measured indices. METHODS AND RESULTS: In the cross-sectional analysis, plasma viscosity (P=0.001), fibrinogen (P=0.02), vWF (P<0.0001), and soluble P-selectin (P<0.001) levels were elevated in patients with CHF compared with healthy controls. Women demonstrated greater abnormalities of hemorheological indices and vWF than males (all P<0.05). Plasma viscosity (P=0.009) and fibrinogen (P=0.0014) levels were higher in patients with more severe symptoms (New York Heart Association [NYHA] class III-IV), but there was no relationship with left ventricular ejection fraction. When ACE inhibitors were introduced, there was a reduction in fibrinogen (repeated-measures ANOVA, P=0.016) and vWF (P=0.006) levels compared with baseline. There were no significant changes in hemorheological, endothelial, or platelet markers after the introduction of beta-blocker therapy, apart from a rise in mean platelet count (P<0.001). CONCLUSIONS: Abnormal levels of soluble P-selectin, vWF, and hemorheological indices may contribute to a hypercoagulable state in CHF, especially in female patients and in those with more severe NYHA class. Treatment with ACE inhibitors improved the prothrombotic state in CHF, whereas the addition of beta-blockers did not. These positive effects of ACE inhibitors may offer an explanation for the observed reduction in ischemic events in clinical trials.  (+info)

Respiratory sinus arrhythmia is not considered a major health concern. However, other arrhythmias can sometimes indicate heart disease.. An older person with a severe arrhythmia may require a pacemaker. People with sleep apnea are also more likely to experience arrhythmias, including respiratory sinus arrhythmia.. Cases of respiratory sinus arrhythmia in children and young people will often improve without treatment, as someone ages. This is because a childs heart is still growing and developing and changes to the heart can lead to respiratory sinus arrhythmia.. If a child has a respiratory sinus arrhythmia, a doctor may wish to monitor it but will probably not offer any treatment unless the problem becomes severe, causes symptoms, or continues into adolescence.. However, cases in older people are more unusual and may require further examination. If respiratory sinus arrhythmia is caused by an underlying heart disease, then that will need to be treated separately.. ...
Respiratory Sinus Arrhythmia, the variation in the heart rate synchronized with the breathing cycle, forms an interconnection between cardiac-related and respiratory-related signals. It can be used by itself for diagnostic purposes, or by exploiting the redundancies it creates, for example by extracting respiratory rate from an electrocardiogram (ECG). To perform quantitative analysis and patient specific modeling, however, simultaneous information about ventilation as well as cardiac activity needs to be recorded and analyzed. The recent advent of medically approved Electrical Impedance Tomography (EIT) devices capable of recording up to 50 frames per second facilitates the application of this technology. This paper presents the automated selection of a cardiac-related signal from EIT data and quantitative analysis of this signal. It is demonstrated that beat-to-beat intervals can be extracted with a median absolute error below 20 ms. A comparison between ECG and EIT data shows a variation in ...
What are its causes and treatment? ![Sinus arrhythmia ECG][1] [1]: https:// ... UZ2KinCsWvI/AAAAAAAAAag/08NDvy8_7vE/w535-h141-no/Sinus+arrhythmia.jpg
This article will define what a sinus arrhythmia is, what the different types are and what causes a sinus arrhythmia. It will also briefly discuss the symptoms and treatment.
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The Pocket Guide to Polyvagal Theory. The polyvagal theory explains the biological origins of a variety of social behaviors and emotional disorders. â ¢ Describe levels of reaction to perceived threat using Polyvagal Theory â ¢ Rethink behaviours of concern as an autonomic defensive reaction to perceived threat and lack of connection â ¢ Explain to others concepts involved in safety â that is absence of fear as well as the presence of connection The Pocket Guide to Polyvagal Theory: The Transformative Power of Feeling Safe by Stephen Porges (2017) The Polyvagal Theory in Therapy by Deb Dana (2018) The Polyvagal Theory: Neurophysiological Foundations of Emotions, Attachment Communication and Self-Regulation by Stephen Porges PhD (2011) Sympathetic 2. I have just finished The Pocket Guide to the Polyvagal Theory by Dr Stephen Porges. A review of The Pocket Guide to the Polyvagal Theory: The Transformative Power of Feeling Safe. Lots of science. How the Polyvagal Theory Refines Our ...
what does sinus arrhythmia non specific intraventricular conduction delay mean?what is its causes? This discussion is related to |a href=http://www.medhelp.org/posts/show/409489|abnormal ekg|/a|.
The Analgesia Nociception Index calculation relies on the acquisition of R-R series which allows to measure the influence of respiration on the heart rate: this influence is related to a brief parasympathetic tone increase associated with each respiratory cycle. The result is a shortening of R-R intervals during inspiration, which is expressed by respiratory sinus arrhythmia. The clinical value of respiratory sinus variability analysis appeared in 1965 when Hon and Lee noticed that fetal distress is preceded by a modification of the R-R intervals before a heart rhythm alteration itself. Towards 1970, Ewing and coll developed simple tests using variations of R-R intervals on short periods to detect dysautonomia in diabetic patients. In 1977, Wolf and coll showed that the respiratory sinus variability reduction after myocardial infarction was associated with a decrease of the patients survival. In 1981, Akselrod and coll, were the first to use spectral analysis of the R-R series to quantify the ...
BACKGROUND:. Coronary heart disease continues to be the leading cause of death in the United States, despite risk factor reduction and technological advances in treatment options. Prospective studies implicate chronic anxiety as an independent risk factor for fatal coronary heart disease. In particular, anxiety increases the risk of sudden cardiac death substantially.. DESIGN NARRATIVE:. Nine hundred and fifty CAD patients were recruited for this study from patients hospitalized for elective cardiac catheterization. Anxiety was measured by the Hospital Anxiety Scale, the Spielberger Trait Anxiety Inventory, and the Crown-Crisp Phobic Anxiety Scale. Symptoms of depression were measured by the Montgomery-Asberg Depression Rating Scale, the Hospital Depression Scale, and the Beck Depression Inventory. Vagal control of heart rate was determined using power spectral analysis to measure two indices of vagal control: baroreceptor-mediated vagal reflex cardiac control, and respiratory sinus arrhythmia. ...
In recent years, time-varying inhomogeneous point process models have been introduced for assessment of instantaneous heartbeat dynamics as well as specific cardiovascular control mechanisms and hemodynamics. Assessment of the models statistics is established through the Wiener-Volterra theory and a multivariate autoregressive (AR) structure. A variety of instantaneous cardiovascular metrics, such as heart rate (HR), heart rate variability (HRV), respiratory sinus arrhythmia (RSA), and baroreceptor-cardiac reflex (baroreflex) sensitivity (BRS), are derived within a parametric framework and instantaneously updated with adaptive and local maximum likelihood estimation algorithms. Inclusion of second-order non-linearities, with subsequent bispectral quantification in the frequency domain, further allows for definition of instantaneous metrics of non-linearity. We here present a comprehensive review of the devised methods as applied to experimental recordings from healthy subjects during propofol ...
Choir singing is known to promote wellbeing. One reason for this may be that singing demands a slower than normal respiration, which may in turn affect heart activity. Coupling of heart rate variability (HRV) to respiration is called Respiratory sinus arrhythmia (RSA). This coupling has a subjective as well as a biologically soothing effect, and it is beneficial for cardiovascular function. RSA is seen to be more marked during slow-paced breathing and at lower respiration rates (0.1 Hz and below). In this study, we investigate how singing, which is a form of guided breathing, affects HRV and RSA. The study comprises a group of healthy 18 year olds of mixed gender. The subjects are asked to; (1) hum a single tone and breathe whenever they need to; (2) sing a hymn with free, unguided breathing; and (3) sing a slow mantra and breathe solely between phrases. Heart rate (HR) is measured continuously during the study. The study design makes it possible to compare above three levels of song structure. In a
Author(s): Waters, Sara F; Mendes, Wendy Berry | Abstract: Coordinated social behavior and positive affect shared between parent and child in early life provide a foundation for healthy social and emotional development. We examined physiological (cardiac vagal responses) and relational (attachment security) predictors of dyadic behavioral coordination in a sample of 13-month-old infants and their mothers (N = 64). We tested whether cardiac vagal responses moderated the association between attachment security and behavioral coordination. The main effect of attachment on coordination was moderated by infant cardiac vagal tone (i.e., respiratory sinus arrhythmia [RSA] during rest). Securely attached infants with lower cardiac vagal tone were more behaviorally coordinated with their mothers; there was no association between attachment and coordination for infants with high cardiac vagal tone. Infants with greater increases in cardiac vagal reactivity (i.e., RSA during social engagement) exhibited greater
Abstract. This study examined the existence of direct maternal-infant physiological relatedness in respiratory sinus arrhythmia (RSA) when the infant was age 1, 2, 4, 8, and 12 weeks. We instructed mothers to breathe at 6, 12, 15, 20, and 6 cycles per minute while their infants lay on their body. The mother-infant ECG and respiration were registered and video recordings were made. RR-interval (RRI), respiration rate (fR) and RSA were calculated and mother-infant RSA response-patterns were analyzed. The results revealed that infants adjusted their RSA levels to their mothers levels during the first 2 months of life, but not at 3 months of age, which could be interpreted as a continuing intra-uterine effect. The attenuation between 2 and 3 months could be a reflection of the 2-month developmental shift of social orientation. ...
In this article, the design and development of a real-time heart rate (HR) and respiratory rate (RR) monitoring device is reported. The proposed device is designed to impose minimum data acquisition hazards on the subject. In standard bedside monitors, HR and RR are derived from electrocardiogram (ECG) and respiration signals, respectively, and different electrodes are required for capturing the 12-lead ECG and respiration via a chest belt, which is cumbersome for patients and healthcare providers. Respiration signal has an impact on ECG due to anatomical proximity of the heart and lung, and ECG is modulated by respiration, a phenomenon known as respiratory sinus arrhythmia (RSA). In the proposed method, the ECG signal is acquired using clip electrodes at the wrists and the respiration signal is extracted from the ECG using an Arduino Uno microcontroller-based real-time processing of ECG. RR is then derived from ECG-derived respiration (EDR). The prototype is tested on healthy subjects and ...
The neural control of the cardiovascular and respiratory systems are highly interrelated. These cardiorespiratory interactions are mediated by synaptic pathways within the CNS and are mediated largely, if not entirely, via the vagal innervation of the heart. In each respiratory cycle, the heart beats more rapidly during inspiration and slows during postinspiration and expiration (often referred to as respiratory sinus arrhythmia). The respiratory system also influences heart rate by modulating the baroreceptor and chemoreceptor input to cardiac vagal neurons. In animals and humans, the baroreceptor and chemoreceptor reflexes are inhibited during inspiration and are facilitated during postinspiration and expiration or during a maintained phase of postinspiration and apnea. As another example, stimulation of sensory laryngeal receptors evokes a prolonged apnea and a maintained and dramatic decrease in heart rate.14 This laryngeal reflex can be so exaggerated in newborns that it can lead to death ...
It has become increasingly apparent that congestive heart failure (CHF) affects not only the cardiovascular system, but every organ system involved with oxygen transport, including the respiratory system, skeletal muscles, and the hormonal and neural feedback control systems for breathing, cardiac output, blood pressure, blood volume, and distribution of blood flow. One segment of this transport system cannot be isolated from the rest. The ventilatory response to exercise in patients with CHF is augmented despite normal arterial O2 saturation and a normal or low end-tidal Pco2.1 2 3 4 5 6 The augmented ventilatory response is measured as a steep slope of the increase in ventilation with respect to CO2 output (ΔV̇e/ΔV̇co2) or as a high V̇e/V̇co2 ratio at peak exercise. The source of this ventilatory augmentation has been controversial, but its pathophysiological significance is clear. A high slope at submaximal exercise or a high V̇e/V̇co2 ratio at peak exercise is a powerful index of ...
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Jenkins, KJ et al. JTCVS 2002;123:110-8 Risk Adjusted Congenital Heart Surgery Score RACHS category 1: 1. Secundum ASD 2. Aortopexy ...
How do pressure fluctuations in a fluid flowing through a complicated pipe system (such as an engine lubrication system) affect its temperature? Does the net fluid temperature increase with increase in the magnitude of pressure fluctuations? Or does it decrease? Thanks in advance. | Pressure fluctuations vs Temperature
Here is the foreword to the article in Wikipedia: The Polyvagal theory (gr. polus, many + vagal, vagus nerve) specifies two functionally distinct branches of the vagus, or tenth cranial nerve. It serves to identify the relationship between visceral experiences and the vagus nerves parasympathetic control of the heart, lungs, and digestive tract. The theory was introduced in 1994 by Dr. Stephen Porges, director of the Brain-Body Center at the University of Illinois at Chicago. According to the theory and its increasing evidence base, the autonomic nervous system is interconnected with and sensitive to influences that flow from the body toward the brain, called afferent influences. This effect has been observed and demonstrated by adaptive reactivity dependent on the neural circuits phylogenetical development. It builds on the study of what Charles Darwin referred to as the pneumogastric nerve. The polyvagal theory claims that humans have physical reactions, such as cardiac and ...
Lecture 5 - Host-Parasite Coevolution II: Virulence, resistance & Tolerance I. Variation in host damage Observation: Variation in a microbes ability to damage a host exists. Microbes can be mutualistic, commensal and parasitic, even within the same genera or species. For example, Escherichia coli exhibit a large range of host interactions from mutualistic (producing vitamin K) to parasitic (producing death). Question: What causes this variation? A. Host damage is caused by a parasites pathogenicity. Pathogenicity is the parasites ability or potential to cause host damage (e.g. the mechanism of damage). B. The extent of host damage (in terms of fitness) induced by parasite pathogenicity is termed virulence (e.g. the extent of damage) II. Pathogenesis - the generation of suffering A. Impairing host capabilities 1. Direct interference - some parasites directly interfere with organ function. For example, some trematodes infect fish gills, reducing gas exchange efficiency. Also, some parasites may ...
Analyzing 1-minute ECG recording obtained in a patient with acute myocardial infarction immediately upon admission to coronary unit, they concluded that patients with sinus arrhythmia, that is, with more pronounced sinus impulse variability, had a lower mortality rate than patients with less pronounced variability of sinus impulses [7]. Sergeant P, Blackstone E, Meyns B, et al. A 25% increase from this resting heart rate during exercise is usually safe. Also, Stein et al. Data were collected on 5934 CABG patients. Bypass surgery is a major surgery which is usually done because the coronary arteries that bring blood to the heart muscle have become clogged with plaque, which is basically a build up of cholesterol and fat. We will be providing unlimited waivers of publication charges for accepted research articles as well as case reports and case series related to COVID-19. For those who want to exercise but are not sure of the right exercise regimen, we suggest talking to your heart physician. ...
Name : Mohammad Essa Sex : Male Nationality : Pakistani Age : 6Y Diagnosis : 1. Retinopathy 2. Sinus arrhythmia Date of Admission : Sept. 5th, 2017 Treatment hospital/period : Wu Medical Center/13 days Before treatment: The patient was born with an
The flow-induced pressure fluctuations in a door gap cavity model were investigated experimentally using a quiet wind tunnel facility. The cavity cross-section dimensions were typical of road vehicle door cavities, but the span was only 25 cm. One cavity wall included a primary bulb rubber seal. A m
Breakthrough technology that resets the neural system by Dr. Stephen Porges, father of the Polyvagal Theory. Based on four decades of research, this technology has the ability to improve stress, anxiety, or trauma-based issues. Improves resilience, social engagement, and improves ability to recover from emotional and safety triggers.
The RSA Challenge numbers are the kind we believe to be the hardest to factor; these numbers should be particularly challenging. These are the kind of numbers used in devising secure RSA cryptosystems.. This page serves as an archive for the factoring challenges conducted by RSA Laboratories through 2007.. ...
RSA Events include over 100 free public lectures, talks, debates and screenings a year, as well as networking events and conferences exclusive to RSA Fellows, plus workshops hosted by the RSA Action & Research Centre.
RSA Events include over 100 free public lectures, talks, debates and screenings a year, as well as networking events and conferences exclusive to RSA Fellows, plus workshops hosted by the RSA Action & Research Centre.
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The cardiopulmonary and respiratory laboratory studies dynamic regulation of blood flow through the lungs and how it affects human physiology and performance as it relates to pulmonary gas exchange efficiency, pulmonary artery pressure and right heart function in health and disease. The lab also studies intrapulmonary arteriovenous anastemoses and BPD (Bronchopulmonary displaysia). |meta name=msvalidate.01 content=9A2A53050FA36F851B9520901A24D4F9 /|
Heart Rate Variability, or HRV for short, is the measure of variation in timing between successive heart beats. It has been shown that heart rate and HRV are regulated by both the sympathetic (SNS) and parasympathetic (PSNS) branches of the autonomic nervous system (ANS). Only looking at total variability, or by simply reporting heart rate, it is not clear which side of the autonomic nervous system is active at a given time. Depending on what is being studied, it can be desirable to distinguish between sympathetic and parasympathetic influence.. By breaking down HRV into frequency components, it is possible to isolate a specific range of frequencies which has been shown to correlate almost exclusively to parasympathetic nervous system activity. This range of frequencies, known as high frequency HRV, is associated with a physiological phenomenon known as Respiratory Sinus Arrhythmia (RSA). This blog series is intended to discuss the process by which this and many more statistics are calculated ...
Heart Rate Variability (HRV) and respiratory sinus arrhythmia are directly associated with autonomic flexibility, self-regulation and well-being, and inversely associated with physiological stress, psychological stress and pathology. Yoga enhances autonomic activity, mitigates stress and benefits st …
Two experiments were conducted to measure both the psychological and physiological effects of touching on the HPA axis related parts of the body. HPA stands for the hypothalamus, pituitary, and adrenal. One experiment was conducted with a group of healthy experiment participants, and another was with a group of traumatized participants who had Adverse Childhood Experiences (ACE). In the experiments, the back of an experiment participant was touched, where a kidney-adrenal was supposed to reside, and both the psychological and physiological effects were measured. As a result, respiratory sinus arrhythmia (RSA), an indicator of the parasympathetic nerve system function and, especially, an indicator of the social engagement system increased, by a statistically significant degree, as a consequence of HPA touching in both the healthy and the trauma group, in comparison with the control. The traumatized participants had a lower RSA, and this was increased by HPA touching, accompanied by a decrease of the
TY - JOUR. T1 - Fetal responses to induced maternal relaxation during pregnancy. AU - DiPietro, Janet A.. AU - Costigan, Kathleen A.. AU - Nelson, Priscilla. AU - Gurewitsch, Edith D.. AU - Laudenslager, Mark L.. N1 - Funding Information: This research was supported by awards from the NIH/NICHD, R01 HD27592 to JAD and NIAAA, AA013973 and the Developmental Psychobiology Endowment Funds, University of Colorado to MLL.. PY - 2008/1. Y1 - 2008/1. N2 - Fetal responses to induced maternal relaxation during the 32nd week of pregnancy were recorded in 100 maternal-fetal pairs using a digitized data collection system. The 18-min guided imagery relaxation manipulation generated significant changes in maternal heart rate, skin conductance, respiration period, and respiratory sinus arrhythmia. Significant alterations in fetal neurobehavior were observed, including decreased fetal heart rate (FHR), increased FHR variability, suppression of fetal motor activity (FM), and increased FM-FHR coupling. Attribution ...
The present study examined the ability of a Virtual Reality (VR) public speaking task to elicit physiological arousal in adults with SAD (n=25) and Controls (n=25). A behavioral assessment paradigm was employed to address three study objectives: (a) to determine whether the VR task can elicit significant increases in physiological response over baseline resting conditions (b) to determine if individuals with SAD have a greater increase from baseline levels of physiological and self-reported arousal during the in vivo speech task as opposed to the VR speech task and (c) to determine whether individuals with SAD experience greater changes in physiological and selfreported arousal during each speech task compared to controls. Results demonstrated that the VR task was able to elicit significant increases in heart rate, skin conductance, and respiratory sinus arrhythmia, but did not elicit as much physiological or self-reported arousal as the in vivo speech task. In addition, no differences were found
In general patients who show a sinus bradycardia on their ECG will show little other signs and symptoms depending on the rate of their rhythm and any co-factors such as an acute coronary syndrome, pain, injuries, etc. Most patients will appear well perfused with good skin colour, warmth and no diaphoresis. If patients are on common blood pressure medications such as Beta Blockers it is likely that these will have artificially lowered the persons heart rate and that their normal resting heart rhythm is a sinus bradycardia.. In general, patients who have a sinus bradycardia are not hypotensive. This is because as we learned in Starlings Law, the slower the heart rate the greater time allowed for ventricular filling (which is passive), ventricular stretching (pre-load) and subsequent cardiac output.. ...
A sinus rhythm is any cardiac rhythm where depolarization of the cardiac muscle begins at the sinus node. It is characterised by the presence of correctly oriented P waves on the electrocardiogram (ECG). Sinus rhythm is necessary, but not sufficient, for normal electrical activity within the heart. The term normal sinus rhythm (NSR) is sometimes used to denote a specific type of sinus rhythm where all other measurements on the ECG also fall within designated normal limits, giving rise to the characteristic appearance of the ECG when the electrical conduction system of the heart is functioning normally. However, other sinus rhythms can be entirely normal in particular patient groups and clinical contexts, so the term is sometimes considered a misnomer and its use is sometimes discouraged. Other types of sinus rhythm which can be normal include sinus tachycardia, sinus bradycardia and sinus arrhythmia. Sinus rhythms may be present together with various other cardiac arrhythmias on the same ECG. ...
Arrhythmia occurs when the hearts rhythm becomes disturbed or arrhythmic. The most common form of arrhythmia is a heart palpitation, known as sinus arrhythmia. More serious forms of heart arrhythmia include atrial fibrillation, ventricular tachycardia and ventricular fibrillation. Arrhythmia requires medical treatment; some rhythm disturbances are addressed through the use of medications, defibrillation, or a pacemaker. Natural options for heart support include fish oil, hawthorn, vitamin C and magnesium.
Sinus bradycardia is a type of slow heartbeat. A special group of cells begin the signal to start your heartbeat. These cells are in the sinoatrial (SA) node. Normally, the SA node fires at about 60 to 100 times per minute at rest. In sinus bradycardia, the node fires less than 60 times per minute.
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Antabuse - The bradycardia of jaundice is also a sinus arrhythmia, In relation to extrasystolic arrhythmia, the most significant results are those of Lewis and Siiberberg,
Dear Doctor, After feeling as if I were about to black out, I was hooked up to a Holter and these were the findings (Im 43, female, weight ok): -sinus rhythm, sinus arrhythmia, sinus tachycardia, at...
Crit care med s, . one viagra 100mg than more take to ok it is of at time? Section ii approach to the greater trochanter of the rectus sheath. Valvular and ventricular tachycardia and conduction abnormalities sinus arrhythmia demonstrates circadian modulation as does the mechanoreceptor input from the central nervous system is very often unstable. Fasciae of the moment arms of the. J clin gastroenterol , . Serour f, gorenstein a treatment for anaphylaxis includes supporting ventilation and of episodes for several months to years for a spiritual dimension to the lack of stability of the most sensitive but least sensitive guideline used by plastic surgeons as a total of mlkg of iv fluids, usually ns or lactated ringers solution, or sterile intravenous contrast with or without radiation. Moreover, the ecg tracing. To mlkghr for the most frequent transports for ages less than years old.- it appears that the newborns intake is not widely available. J biomed eng strogatz sh, abrams dm, mcrobie a, ...
http://www.nicabm.com/treating-trauma/?del=youtube The polyvagal theory is the brain child of Stephen Porges, PhD. What Dr. Stephen Porges proposes in his po...
Sinus bradycardia can be defined as a sinus rhythm with a resting heart rate of 60 beats per minute or less. However, few patients actually become symptomatic until their heart rate drops to less than 50 beats per minute.
Sinus bradycardia can be defined as a sinus rhythm with a resting heart rate of 60 beats per minute or less. However, few patients actually become symptomatic until their heart rate drops to less than 50 beats per minute.
Hi Doctor I would like to know what does it mean for the ECG findings of Marked Sinus Bradycardia and Counter Clockwise Rotation? I am a Lupus patient . Thanks . More Power ...
The hydraulic equipment was prepared before the test in a 90 MPa pressure cylinder with a test pressure of 78 MPa.. Through the experiment, GENERAL SEALTECH LIMITED established a mathematical model of compensation pressure, which was obtained through analysis.. 1. Asymmetric actuator action is the main factor causing compensation pressure fluctuations;. 2. The process of compensating pressure fluctuation caused by the action of asymmetric actuator is mathematically modeled, and the peak value of compensating pressure fluctuation at steady-state operating point and the peak value of pressure difference inside and outside the rolling diaphragm are obtained, and it is pointed out that the inner diameter of compensator is affecting pressure fluctuation. The main structural parameters of the peak value and the peak value of the internal and external pressure difference, which should take a large value;. 3. According to the rolling diaphragm strength theory, according to the design criterion that the ...
Leidl MC, Choi CJ, Syed ZA, Melki SA. Intraocular pressure fluctuation and glaucoma progression: what do we know?. Br J Ophthalmol 2014;98(10):1315-1319.
The tachy brady syndrome is also known as sinus node dysfunction or the sick sinus syndrome. If we were to give a simple definition of this condition, it is an | PatientHelp
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In this article, you will learn the importance of the vagus nerve, how to test your vagal tone and simple strategies to improve vagal tone.
When do you feel safe? When are you on guard? If you feel safe except when there is an actual threat to your safety, then you have high vagal tone. If you feel guarded most or all of the time, even when there is no actual threat to your safety, you have low vagal tone.…
An arrhythmia (also called irregular heartbeat) is a problem with the rate or rhythm of the heart. In an arrhythmia, the heart could either beat too fast, too slowly, or with an irregular pattern.
The steady lup-dup, lub-dup regularity of our hearts pumping beat is reassuring, and we dont mind it speeding up for exercise or slowing down for sleep, as long as its rhythm remains steady. Any glitch in that rhythmic throb, whether too slow or too fast, is called an arrhythmia. In either case, you can feel dizzy or lightheaded because not enough blood is getting to the brain when the heart rhythm is off-kilter. To assess and correct an arrhythmia requires a medical professional. Many times it...
The ALLMedicine™ Arrhythmias Center contains research, news, guidelines, drugs, clinical trials, and patient ed. Information related to Arrhythmias. Browse Now!
Arrhythmias are abnormal heartbeats usually caused by an electrical short circuit in the heart. Many are minor and not a significant health threat, but others can indicate a more serious problem.
Arrhythmias are abnormal heartbeats usually caused by an electrical short circuit in the heart. Many are minor and not a significant health threat, but others can indicate a more serious problem.
Arrhythmias are abnormal heartbeats usually caused by an electrical short circuit in the heart. Many are minor and not a significant health threat, but others can indicate a more serious problem.
With the rapidly changing lifestyle of the modern youth, occurrence of heart diseases post the age of 45 has become a common trend. One such disease is Arrhythmia which can be described as t…
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Respiratory Sinus ArrhythmiaEdit. Bainbridge Reflex is involved in Respiratory Sinus Arrhythmia. During inhalation ...
Respiratory sinus arrhythmia (RSA) is typically a benign, normal variation in heart rate that occurs during each breathing ... Respiratory sinus arrhythmia is frequently used as a noninvasive method for investigating vagal tone, in physiological, ... Hayano J, Yasuma F, Okada A, Mukai S, Fujinami T (August 1996). "Respiratory sinus arrhythmia. A phenomenon improving pulmonary ... Hayano J, Yasuma F, Okada A, Mukai S, Fujinami T (August 1996). "Respiratory sinus arrhythmia. A phenomenon improving pulmonary ...
The first, respiratory sinus arrhythmia, is usually found in young and healthy adults. Heart rate increases during inhalation ... The third, sick sinus syndrome, covers conditions that include severe sinus bradycardia, sinoatrial block, sinus arrest, and ... Pathological causes include sinus bradycardia, sinus arrest, sinus exit block, or AV block. Idioventricular rhythm, also known ... sinus bradycardia, is a sinus rhythm of less than 60 BPM. It is a common condition found in both healthy individuals and those ...
This is often accompanied by sinus arrhythmia. The pulse of a person with athlete's heart can sometimes be irregular while at ... Among the many alternative causes are episodes of isolated arrhythmias which degenerated into lethal VF and asystole, and ... The ECG can detect sinus bradycardia, a resting heart rate of fewer than 60 beats per minute. ... ECG - typical findings in resting position are, for example, sinus bradycardia, atrioventricular block (primary and secondary) ...
Generally, deviation from normal sinus rhythm is considered a cardiac arrhythmia. Thus, the first question in interpreting an ... Once sinus rhythm is established, or not, the second question is the rate. For a sinus rhythm this is either the rate of P ... In normal resting hearts, the physiologic rhythm of the heart is normal sinus rhythm (NSR). Normal sinus rhythm produces the ... If the rate is too fast then it is sinus tachycardia and if it is too slow then it is sinus bradycardia. ...
"Origin of Respiratory Sinus Arrhythmia in Conscious Humans." Circulation. 95:1813-1821. Retrieved 1 December 2006. Burgess, ...
... sinus arrhythmia, atrial arrhythmia, ventricular arrhythmia. Rhythms can be evaluated by measuring a few key components of a ... There are 6 different sinus arrhythmia. A normal heart should have a normal sinus rhythm, this rhythm can be identified by a ... Sinus arrhythmia is an irregular rhythm with a ventricular rate of 60 - 100 normally, however a slow rhythm can be ... A wandering atrial pace maker can be either normal or irregular in rate, much like a sinus arrhythmia the rate is normally ...
Ritz, T.; Thons, M.; Fahrenkrug, S.; Dahme, B. (2005). "Airways, respiration, and respiratory sinus arrhythmia during picture ...
doi:10.1111/j.1532-7795.2011.00762.x. Grossman P, Wilhelm FH, Spoerle M (August 2004). "Respiratory sinus arrhythmia, cardiac ... by which the parasympathetic nervous system acts on vascular and cardiac control is the so-called respiratory sinus arrhythmia ...
... is involved in Respiratory Sinus Arrhythmia. During inhalation intrathoracic pressure decreases. It triggers ...
It is considered a benign arrhythmia especially in the setting of STEMI(where it is conventionally thought to be an indicator ... This most commonly occurs in the setting of a sinus bradycardia. Accelerated idioventricular rhythm is the most common ... Accelerated idioventricular arrhythmias are distinguished from ventricular rhythms with rates less than 40 (ventricular escape ... Idioventricular means "relating to or affecting the cardiac ventricle alone" and refers to any ectopic ventricular arrhythmia. ...
There are two primary fluctuations: Respiratory arrhythmia (or respiratory sinus arrhythmia). This heart rate variation is ... Activity in this range is associated with the respiratory sinus arrhythmia (RSA), a vagally mediated modulation of heart rate ... However, it places more emphasis on respiratory sinus arrhythmia and its transmission by a hypothesized neural pathway distinct ... Jönsson P (January 2007). "Respiratory sinus arrhythmia as a function of state anxiety in healthy individuals". International ...
He has edited or co-edited three peer-reviewed journal supplements and several books, including "Cardiac Arrhythmia: Mechanisms ... "Dronedarone for maintenance of sinus rhythm in atrial fibrillation or flutter". New England Journal of Medicine. 357 (10): 987- ... Diagnosis, and Management" (2001); "Clinical Management of Atrial Fibrillation" (2015); and "Cardiac Arrhythmias, Pacing and ...
Cardiovascular features include hypotension, sinus bradycardia, and ventricular arrhythmias. Other features may include ... The main causes of death are ventricular arrhythmias and asystole, paralysis of the heart or of the respiratory center. The ... Other drugs used for ventricular arrhythmia include lidocaine, amiodarone, bretylium, flecainide, procainamide, and mexiletine ...
Cardiovascular features include hypotension, sinus bradycardia, and ventricular arrhythmias. Other features may include ... The main causes of death are ventricular arrhythmias and asystole, or paralysis of the heart or respiratory center. The only ... Other drugs used for ventricular arrhythmia include lidocaine, amiodarone, bretylium, flecainide, procainamide, and mexiletine ... ventricular arrhythmia and death. Marked symptoms may appear almost immediately, usually not later than one hour, and "with ...
Cardiovascular features include hypotension, sinus bradycardia, and ventricular arrhythmias. Other features may include ... The main causes of death are ventricular arrhythmias and asystole, paralysis of the heart or of the respiratory center. The ... Other drugs used for ventricular arrhythmia include lidocaine, amiodarone, bretylium, flecainide, procainamide, and mexiletine ... "Malignant ventricular arrhythmias due to Aconitum napellus seeds". Circulation. 102 (23): 2907-8. doi:10.1161/01.cir.102.23. ...
"Types of Arrhythmia". NHLBI. July 1, 2011. Archived from the original on June 7, 2015. Retrieved September 29, 2016. "BestBets ... Comparing Valsalva manoeuvre with carotid sinus massage in adults with supraventricular tachycardia". Archived from the ... "What Are the Signs and Symptoms of an Arrhythmia?". NHLBI. July 1, 2011. Archived from the original on 19 February 2015. ... Blomström-Lundqvist ET AL., MANAGEMENT OF PATIENTS WITH Supraventricular Arrhythmias. J Am Coll Cardiol 2003;42:1493-531 " ...
The upper limit of normal rate for sinus tachycardia is thought to be 220 bpm minus age. Ventricular tachycardia (VT or V-tach ... Atrial fibrillation is one of the most common cardiac arrhythmias. In general, it is an irregular, narrow complex rhythm. ... Presented order of most to least common, they are: Narrow complex Sinus tachycardia, which originates from the sino-atrial (SA ... an arrhythmia of the rapid rate type). This is why five of the aforementioned dictionaries do not enter cross-references ...
In polyvagal theory the term vagal tone is equated with respiratory sinus arrhythmia (RSA), which is suggested to be linked to ... Grossman, Paul; Taylor, Edwin W. (2007-02-01). "Toward understanding respiratory sinus arrhythmia: Relations to cardiac vagal ... "Toward understanding respiratory sinus arrhythmia: Relations to cardiac vagal tone, evolution and biobehavioral functions". ... "Respiratory sinus arrhythmia reactivity across empirically based structural dimensions of psychopathology: A meta-analysis". ...
"Novel mutation in the α-myosin heavy chain gene is associated with sick sinus syndrome". Circulation: Arrhythmia and ... MYH6 has also been identified as a susceptibility gene for sick sinus syndrome. A missense mutation at Arg721Trp was identified ... Mutations in MYH6 have been associated with late-onset hypertrophic cardiomyopathy, atrial septal defects and sick sinus ... "A rare variant in MYH6 is associated with high risk of sick sinus syndrome". Nature Genetics. 43 (4): 316-20. doi:10.1038/ng. ...
... suggesting supraventricular or ventricular arrhythmias (including sinus tachycardia) and irregular "fluttering" suggesting ... Eby G, Halcomb WW (2006). "Elimination of cardiac arrhythmias using oral taurine with l-arginine with case histories: ... Medic8 Family Health Guide MedlinePlus Medical Encyclopedia, NIH Arrhythmia (palpitations) Heart Palpitations Irregular ... Hypothesis for nitric oxide stabilization of the sinus node" (PDF). Medical Hypotheses. 67 (5): 1200-4. doi:10.1016/j.mehy. ...
During EPS, sinus rhythm as well as supraventricular and ventricular arrhythmias of baseline cardiac intervals is recorded.[1] ... Last, the electrophysiologist may administer various drugs (proarrhythmic agents) to induce arrhythmia (inducibility of VT/VF[3 ... Then the electrophysiologist tries to provoke arrhythmias and reproduce any conditions that have resulted in the patient's ... Management of Cardiac Arrhythmias. Contemporary cardiology. Hanumana Press. pp. 123-140. doi:10.1007/978-1-60761-161-5. ISBN ...
Although the most common arrhythmia is sinus bradycardia, asystole can be seen in its severe form. The reflex can also have non ...
Pericardium is formed by sinus venosus mesenchymal cells that undergo MET. Quite similar processes occur also while ... Injured pericardium undergoes EMT and is transformed into adipocytes or myofibroblasts which induce arrhythmia and scars. MET ...
2013). Respiratory sinus arrhythmia and auditory processing in autism: Modifiable deficits of an integrated social engagement ...
... is a medical procedure by which an abnormally fast heart rate (tachycardia) or other cardiac arrhythmia is ... Various antiarrhythmic agents can be used to return the heart to normal sinus rhythm. Pharmacological cardioversion is an ... Electrical therapy is inappropriate for sinus tachycardia, which should always be a part of the differential diagnosis. ... After the procedure, the patient is monitored to ensure stability of the sinus rhythm. ...
This symptom is usually accompanied by a loss of respiratory sinus arrhythmia - the usual change in heart rate seen with normal ...
Holter ECGs can be used to identify asymptomatic arrhythmias. EKG changes may be present, showing low voltage and conduction ... abnormalities like atrioventricular block or sinus node dysfunction. Laboratory tests including urea and creatinine levels, ... Cheung CC, Roston TM, Andrade JG, Bennett MT, Davis MK (March 2020). "Arrhythmias in Cardiac Amyloidosis: Challenges in Risk ... Cardiac manifestations include: Dyspnea on exertion Peripheral edema and ascites Pericardial effusion Arrhythmias (secondary to ...
Another rhythm in heart rate is caused by respiration (respiratory sinus arrhythmia), such that heart rate rises during ... Lehrer P, Smetankin A, Potapova T (September 2000). "Respiratory sinus arrhythmia biofeedback therapy for asthma: a report of ... Zucker TL, Samuelson KW, Muench F, Greenberg MA, Gevirtz RN (June 2009). "The effects of respiratory sinus arrhythmia ... respiratory sinus arrhythmia, and cardio-respiratory synchrony?". Biofeedback. 35 (2): 54-61. Berntson GG, Quigley KS, Lozano D ...
Torsades de pointes - A polymorphic arrhythmia that can be syptomatic and tends to resolve to a normal sinus rhythm. However, ... Cardiac arrhythmias - conditions in which the heartbeat is irregular, too fast, or too slow. Many types of arrhythmia have no ... Selective serotonin reuptake inhibitors (SSRI) - Toxicity causes arrhythmias including sinus tachycardia, junctional rhythms, ... Sick sinus syndrome, Bradycardia-tachycardia syndrome (BTS) - Disease of the SA node that results in irregular changes in heart ...
... cerebral venous sinus thrombosis). Nonpenetrating and penetrating cranial trauma can also be common causes of intracerebral ... or cardiac arrhythmias Nuchal rigidity Subhyaloid retinal hemorrhages Altered level of consciousness Anisocoria, Nystagmus ...
... sinus node disease (SND) or sick sinus syndrome. Where the problem is atrioventricular block (AVB) the pacemaker is required to ... Biventricular pacing alone is referred to as CRT-P (for pacing). For selected patients at risk of arrhythmias, CRT can be ... and a coronary sinus lead (red arrow). The coronary sinus lead wraps around the outside of the left ventricle, enabling pacing ... Often, for patients in normal sinus rhythm, there is also a lead in the right atrium to facilitate synchrony with the atrial ...
arrhythmia. Bradycardia. *Sinus bradycardia. *Sick sinus syndrome. *Heart block: Sinoatrial. *AV *1° ... Sinus tachycardia, which originates from the sino-atrial (SA) node, near the base of the superior vena cava ... Hyperthyroidism can also cause tachycardia.[5] The upper limit of normal rate for sinus tachycardia is thought to be 220 bpm ... Atrial fibrillation is one of the most common cardiac arrhythmias. In general, it is an irregular, narrow complex rhythm. ...
... severe cardiac arrhythmia and sick sinus syndrome.[15] People with peptic ulcer disease or taking NSAIDS should use with ...
SADS, or sudden arrhythmia death syndrome, is a term used to describe sudden death due to cardiac arrest brought on by an ... sinus node) धाःगु थासं निर्धारित याइ। म्ह तच्वलं संकिबिलय्, दसु व्यायाम याइबिलय् नुगःया साइनस नोदं थःगु वैद्युतीय ज्या तच्वयेकी ... A serious variety of arrhythmia is known as fibrillation. The muscle cells of the heart normally function together, creating a ... Not all the electrical impulses of the heart produce audible or palpable beats; in many cardiac arrhythmias, the premature or ...
Types of Arrhythmia. July 1, 2011 [19 March 2015]. (原始内容存档于2015-06-07).. ... Sinus Bradycardia (页面存档备份,存于互联网
arrhythmia. Bradycardia. *Sinus bradycardia. *Sick sinus syndrome. *Heart block: Sinoatrial. *AV *1° ...
arrhythmia. Bradycardia. *Sinus bradycardia. *Sick sinus syndrome. *Heart block: Sinoatrial. *AV *1° ... "Journal of Arrhythmia (Review). 33 (4): 345-67. doi:10.1016/j.joa.2017.05.004. PMC 5529598. PMID 28765771.. ... "Circulation: Arrhythmia and Electrophysiology. 8 (2): 296-302. doi:10.1161/CIRCEP.114.001909. PMC 4731871. PMID 25684755.. ... "Arrhythmia & Electrophysiology Review. 7 (4): 265-272. doi:10.15420/aer.2018.41.2. ISSN 2050-3369. PMC 6304798. PMID 30588315. ...
It may be used as a nasal/sinus decongestant, as a stimulant,[119] or as a wakefulness-promoting agent.[120] ... they are called arrhythmia, hypertension, and hyperthermia, and may lead to rhabdomyolysis, stroke, cardiac arrest, or seizures ... Pseudoephedrine is used to relieve nasal or sinus congestion caused by the common cold, sinusitis, hay fever and other ...
Carotid sinus syncope is due to pressure on the carotid sinus in the neck.[2] The underlying mechanism involves the nervous ... Arrhythmia, orthostatic hypotension, seizure, hypoglycemia[1]. Treatment. Avoiding triggers, drinking sufficient fluids, ... Carotid sinus syncope[edit]. Pressing upon a certain spot in the neck.[5] This may happen when wearing a tight collar, shaving ... Vasovagal, situational, carotid sinus syncope[1]. Diagnostic method. Based on symptoms after ruling out other possible causes[3 ...
Lower than 8 mg pills are still available Otc for sinus, head colds and flu, but is completely illegal in over the counter ... Cardiovascular: tachycardia, cardiac arrhythmias, angina pectoris, vasoconstriction with hypertension. *Dermatological: ...
pulmonary veins) → left atrium (atrial appendage) → mitral valve → left ventricle → aortic valve (aortic sinus) → (aorta and ... Another form of arrhythmia is that of the ventricular escape beat. This can happen as a compensatory mechanism when there is a ... venae cavae, coronary sinus) → right atrium (atrial appendage, fossa ovalis, limbus of fossa ovalis, crista terminalis, valve ... The most severe form of arrhythmia is ventricular fibrillation which is the most common cause of cardiac arrest and subsequent ...
sinuses. Sinusitis. nose. Rhinitis Vasomotor rhinitis. Atrophic rhinitis. Hay fever. Nasal polyp. Rhinorrhea. nasal septum ... There are many mimics that present with similar symptoms, such as vocal cord dysfunction, cardiac arrhythmias, cardiomyopathies ...
The catheter is subsequently maneuvered to the opening of the coronary sinus in the right atrium. From here a contrast media is ... Implantable cardioverter defibrillators and cardiac resynchronisation therapy for arrhythmias and heart failure - National ... Inability to cannulate coronary sinus (approximately 5% of patients). *Myocardial perforation, pneumothorax and infection, all ... Right ventricular access is direct, while left ventricular access is conferred via the coronary sinus (CS). ...
If arrhythmias prove troublesome, or malignant hyperkalaemia occurs (inexorably rising potassium level due to paralysis of the ... Wang, W; Chen, JS; Zucker, IH (Jun 1990). "Carotid sinus baroreceptor sensitivity in experimental heart failure". Circulation. ... The arrhythmia itself is not affected, but the pumping function of the heart improves, owing to improved filling. ... part I: Patients with digitalis-induced arrhythmias (author's transl)]. Zeitschrift für Kardiologie (in German). 66 (3): 121- ...
arrhythmia. Bradycardia. *Sinus bradycardia. *Sick sinus syndrome. *Heart block: Sinoatrial. *AV *1° ... LGL syndrome is diagnosed in a person who has experienced episodes of abnormal heart racing (arrhythmias) who has a PR interval ... including sinus tachycardia, atrioventricular nodal re-entrant tachycardia, atrial fibrillation, or atrial flutter.[4] ... abnormal heart racing with a short PR interval and normal QRS complexes seen on their electrocardiogram when in a normal sinus ...
arrhythmia. Bradycardia. *Sinus bradycardia. *Sick sinus syndrome. *Heart block: Sinoatrial. *AV *1° ... "An introduction to clinical electrocardiography - Supraventricular Arrhythmias". ECG Learning Center. University of Utah.. ...
Arrhythmia[edit]. Main article: Cardiac dysrhythmia. Arrhythmias are abnormalities of the heart rate and rhythm (sometimes felt ... Effects of Parasympathetic and Sympathetic Stimulation on Normal Sinus Rhythm - The wave of depolarization in a normal sinus ... Spodick, DH (1992). "Operational definition of normal sinus heart rate". Am J Cardiol. 69 (14): 1245-46. doi:10.1016/0002-9149( ... When the heart is not beating in a regular pattern, this is referred to as an arrhythmia. Abnormalities of heart rate sometimes ...
arrhythmia. Bradycardia. *Sinus bradycardia. *Sick sinus syndrome. *Heart block: Sinoatrial. *AV *1° ... Thus the atrium is not depolarized and the sinus node is not reset. Since the sinus p wave to PVC interval is less than the ... This can be mistaken for sinus bradycardia if the APC is buried in the T wave since the APC will reset the SA node and lead to ... This then allows for re-entrant circuits and sets up the ventricle for another PVC after the next sinus beat.[2] The constant ...
It has been implicated in causing ventricular arrhythmia (torsades de pointes). Ebola research[edit]. In June 2015 a research ... "Use of bepridil in combination with Ic antiarrhythmic agent in converting persistent atrial fibrillation to sinus rhythm" ...
"Medications for Arrhythmia". www.heart.org. Retrieved August 10, 2019.. *^ "Beta Blocker Therapy". American College of ... The antiarrhythmic effects of beta blockers arise from sympathetic nervous system blockade-resulting in depression of sinus ... Agents specifically labeled for cardiac arrhythmia *Esmolol,[85] sotalol,[86] landiolol (Japan)[87] ...
Atrial fibrillation, other cardiac arrhythmias, or sudden cardiac death[5]. Heart failure can develop insidiously over time or ... or control cardiac arrhythmias.[10] Patients with hypertensive heart disease should avoid taking over the counter nonsteroidal ... Aneurysm of sinus of Valsalva. *Aortic dissection. *Aortic rupture. *Coronary artery aneurysm ...
"Arrhythmia & Electrophysiology Review. 2 (1): 23-9. doi:10.15420/aer.2013.2.1.23. PMC 4711501. PMID 26835036.. ... Normal sinus top, ventricular tachycardia bottom. 12 lead electrocardiogram showing a run of monomorphic ventricular ... "Types of Arrhythmia". NHLBI. July 1, 2011. Archived from the original on 7 June 2015. Retrieved 7 September 2016.. ... "Journal of Interventional Cardiac Electrophysiology : An International Journal of Arrhythmias and Pacing. 34 (1): 65-71. doi: ...
Sick sinus syndrome. ... Life-threatening arrhythmia[mag-edit , alilan ya ing pikuwanan] ...
"A note on the simultaneous occurrence of sinus and ventricular rhythm in man", Lewis T, Macnalty AS, J. Physiol. 1908 Dec 15;37 ... After the war, he established the clinical research department at UCH and continued his work on cardiac arrhythmia. In 1925 he ...
arrhythmia. Bradycardia. *Sinus bradycardia. *Sick sinus syndrome. *Heart block: Sinoatrial. *AV *1° ...
Upon examination, arrhythmia and heart murmur may raise further suspicion of a cardiac abnormality. Non-cardiac symptoms ... whereas those with left atrial isomerism fail to develop a sinus node at all. Thus, patients with left atrial isomerism are ... Abnormal looping of the ventricles contributes to arrhythmia and heart block in fetuses. Isomerism of the bronchial tree is not ... arrhythmia upon electrocardiogram, and chest x-ray for confirmation of the heart's location across the left-right axis. In ...
Is this dangerous?? I have always had normal sinus rhythm with periods of sinus tachycardia but never sinus arrhythmia or tons ... Is this dangerous?? I have always had normal sinus rhythm with periods of sinus tachycardia but never sinus arrhythmia or tons ... Sinus arrhythmia with PACs & PVCs BlueCheetah55 Hi everyone, I am a 31 year old female with Lyme disease and Babesia since ... Sinus arrhythmia with PACs & PVCs. Hi everyone, I am a 31 year old female with Lyme disease and Babesia since April of 2008. ...
Respiratory sinus arrhythmia is a common type--an this ... Sinus arrhythmia is a common condition. There are different ... Sinus arrhythmia is a common condition. There are different types--some of which are a disease. Respiratory sinus arrhythmia is ... Respiratory sinus arrhythmia is the natural variation of heart rate with breathing. The word sinus means that the heart rhythm ... The word arrhythmia means that the heart rate is irregular--not a constant rate. Respiratory sinus arrhythmia normally occurs ...
Sinus arrhythmia is a commonly encountered variation of normal sinus rhythm. Sinus arrhythmia characteristically presents with ... Vagal tone Soos, Michael P.; McComb, David (2020-08-24). "Sinus Arrhythmia". NCBI Bookshelf. PMID 30725696. Retrieved 17 ... Additionally, P waves are typically mono-form and in a pattern consistent with atrial activation originating from the sinus ... sinus arrhythmia typically indicates good cardiovascular health. ...
Sick sinus syndrome is a heart-rhythm disturbance, or arrhythmia, that involves a group of symptoms, such as the heartbeat ... Arrhythmia. A type of heart disease, arrhythmia causes our hearts to beat too fast, too slow or with an irregular rhythm. Even ... Continue Learning about Arrhythmia. Heart Defects at Birth May Affect Heart Rhythm-Even Years Later ... Preparing to see a doctor about a heart arrhythmia can make you feel nervous. But if you write y... ...
Respiratory sinus arrhythmia (RSA) is being used increasingly in psychophysiological studies as an index of vagal control of ... Respiratory sinus arrhythmia (RSA) is being used increasingly in psychophysiological studies as an index of vagal control of ... Respiratory sinus arrhythmia: autonomic origins, physiological mechanisms, and psychophysiological implications ...
what does sinus arrhythmia non specific intraventricular conduction delay mean?what is its causes? This discussion is related ... what does sinus arrhythmia non specific intraventricular conduction delay mean?. what does sinus arrhythmia non specific ... The term sinus arrhythmia refers to a normal phenomenon of mild acceleration and slowing of the heart rate that occurs with ... The term sinus arrhythmia refers to a normal phenomenon of mild acceleration and slowing of the heart rate that occurs with ...
The non respiratory form is present in diseased hearts and sometimes confused with sinus arrest (also known as sinus pause). ...
Respiratory Sinus Arrhythmia Mediates the Relation Between "Specific Math Anxiety" and Arithmetic Speed. Jiuqing Tang1, Yun Su1 ... Citation: Tang J, Su Y, Yao Y, Peyre H, Guez A and Zhao J (2021) Respiratory Sinus Arrhythmia Mediates the Relation Between " ... Frazier, T. W., Strauss, M. E., and Steinhauer, S. R. (2004). Respiratory sinus arrhythmia as an index of emotional response in ... Gentzler, A. L., Santucci, A. K., Kovacs, M., and Fox, N. A. (2009). Respiratory sinus arrhythmia reactivity predicts emotion ...
Contactless heart rate variability measurement by IR and 3D depth sensors with respiratory sinus arrhythmia ... HRV is composed of two major components: high frequency respiratory sinus arrhythmia (RSA) and low frequency sympathetic ... HRV is composed of two major components: high frequency respiratory sinus arrhythmia (RSA) and low frequency sympathetic ...
Respiratory sinus arrhythmia (RSA, or high-frequency heart-rate variability) is frequently employed as an index of cardiac ... Toward understanding respiratory sinus arrhythmia: relations to cardiac vagal tone, evolution and biobehavioral functions Biol ... Respiratory sinus arrhythmia (RSA, or high-frequency heart-rate variability) is frequently employed as an index of cardiac ...
Epicardial Breakthrough Waves During Sinus Rhythm. Elisabeth M.J.P. Mouws, Eva A.H. Lanters, Christophe P. Teuwen, Lisette J.M. ... Epicardial Breakthrough Waves During Sinus Rhythm. Elisabeth M.J.P. Mouws, Eva A.H. Lanters, Christophe P. Teuwen, Lisette J.M. ... Epicardial Breakthrough Waves During Sinus Rhythm. Depiction of the Arrhythmogenic Substrate?. Elisabeth M.J.P. Mouws, Eva A.H ... EBW were referred to as sinus node breakthrough waves if they were the earliest right atrial activated site. A total of 218 EBW ...
Sinus arrhythmia in children with atrial septal defect: an analysis of heart rate variability before and after surgical repair. ... Sinus arrhythmia in children with atrial septal defect: an analysis of heart rate variability before and after surgical repair. ...
... answered by our Genetic and Rare Diseases Information Specialists for Phocomelia ectrodactyly deafness sinus arrhythmia ... Stoll-Levy-Francfort syndrome; Stoll-Lévy-Francfort syndrome; Phocomelia-ectrodactyly-deafness-sinus arrhythmia syndrome ...
Changes in Heart Period, Heart Period Variability, and A Spectral-Analysis Estimate of Respiratory Sinus Arrhythmias During ... Changes in Heart Period, Heart Period Variability, and A Spectral-Analysis Estimate of Respiratory Sinus Arrhythmias During ... 1984). Changes in Heart Period, Heart Period Variability, and A Spectral-Analysis Estimate of Respiratory Sinus Arrhythmias ...
Respiratory Sinus Arrhythmia. Endogenous Activation of Nicotinic Receptors Mediates Respiratory Modulation of Brainstem ... Respiratory Sinus Arrhythmia. Endogenous Activation of Nicotinic Receptors Mediates Respiratory Modulation of Brainstem ... Respiratory Sinus Arrhythmia. Endogenous Activation of Nicotinic Receptors Mediates Respiratory Modulation of Brainstem ... Respiratory Sinus Arrhythmia. Endogenous Activation of Nicotinic Receptors Mediates Respiratory Modulation of Brainstem ...
I want to pass on the abstract from a preprint that can be downloaded here on studies correlating respiratory sinus arrhythmia ... Resting respiratory sinus arrhythmia (RSAREST) indexes important aspects of individual differences in emotionality. In the ... This change is heart rate is called respiratory sinus arrhythmia (RSA). Thus RSA serves as a measure of vagal tone. Dacher ... What happens in Vagus - compassion, positive emotion, vagal tone, and respiratory sinus arrhythmia, ...
... what the different types are and what causes a sinus arrhythmia. It will also briefly discuss the symptoms and treatment. ... This article will define what a sinus arrhythmia is, ... A sinus arrhythmia is a type of arrhythmia that is ... When diagnosing a sinus arrhythmia the doctor will first discuss the patients symptoms with them and perform a physical exam. ... Causes of Sinus Arrhythmia. written by: R. Elizabeth C. Kitchen • edited by: Leigh A. Zaykoski • updated: 9/25/2009 ...
I had two EKG one from 2009 says normal sinus rhythm with sinus arrhythmia then the second one says sinus rhythm more I had two ... Results read normal sinus rhythm with sinus arrhythmia. Possible left atrial enlargement bor more 43 year old female. Results ... Normal sinus rhythm with sinus arrhythmia Rightward axis T wave abnormality, consider anterior ischemia Abnormal more Normal ... EKG one from 2009 says normal sinus rhythm with sinus arrhythmia then the second one says sinus rhythm rightward axis ...
Phocomelia ectrodactyly deafness sinus arrhythmia information including symptoms, diagnosis, misdiagnosis, treatment, causes, ... Phocomelia ectrodactyly deafness sinus arrhythmia: Introduction. Phocomelia ectrodactyly deafness sinus arrhythmia: A very rare ... Phocomelia ectrodactyly deafness sinus arrhythmia as a symptom. Phocomelia ectrodactyly deafness sinus arrhythmia: Undiagnosed ... Phocomelia ectrodactyly deafness sinus arrhythmia *What is Phocomelia ectrodactyly deafness sinus arrhythmia? *Prevalence and ...
... is a well known cause of cardiac arrhythmias and can be a consequence of any flow abnormality in the sinus node artery (SNA). ... determine if the percentage of subjects with a positive retrospective history of supra-ventricular arrhythmias (SVA) differs in ... The ischemic damage of the sinus node (SN) ... The sinus node as a servomechanism.. Circulation Research 32: ... Early atrial arrhythmias in acute myocardial infarction. Role of the sinus node artery.. Chest 101(4):944-947 ...
Ablation within the aortic sinus of Valsalva for the treatment of ventricular arrhythmias using a standard electrophysiology ...
"Respiratory Sinus Arrhythmia" by people in this website by year, and whether "Respiratory Sinus Arrhythmia" was a major or ... "Respiratory Sinus Arrhythmia" is a descriptor in the National Library of Medicines controlled vocabulary thesaurus, MeSH ( ... Below are the most recent publications written about "Respiratory Sinus Arrhythmia" by people in Profiles. ... Below are MeSH descriptors whose meaning is more general than "Respiratory Sinus Arrhythmia". ...
... and respiratory sinus arrhythmia. Together they form a unique fingerprint. * Respiratory Sinus Arrhythmia Medicine & Life ... Respiratory sinus arrhythmia did not discriminate between age groups but was suppressed during the performance of the oddball ... Respiratory sinus arrhythmia did not discriminate between age groups but was suppressed during the performance of the oddball ... Respiratory sinus arrhythmia did not discriminate between age groups but was suppressed during the performance of the oddball ...
Eckberg DL . Point: counterpoint: respiratory sinus arrhythmia is due to a central mechanism vs. respiratory sinus arrhythmia ... Erratic sinus arrhythmia is a less well-recognized form of persistent arrhythmia that differs from ectopy in that heart beats ... Erratic sinus arrhythmia (see more information below) may also contribute to the HF band despite its non-respiratory origin.15 ... Non-sinus beat/arrhythmia identification. A central premise of HRV is that IBIs approximate SA node-firing patterns, otherwise ...
Sinus arrhythmia during pregnancy. Often in pregnancy when the examination of the heart also reveals a sinus arrhythmia. The ... Sinus arrhythmia as a normal variant. Physiological sinus arrhythmia (ie, normal variant) is quite common in childhood and ... Sinus arrhythmia of the heart. One of the violations of the normal activities of the heart is the sinoatrial (or sinus) ... So consider why there and what is dangerous sinus arrhythmia.. The human heart in norm reduces to the correct sinus rhythm, ...
Arrhythmia and Pacemaker Program at Rush University Medical Center in Chicago. ... Arrhythmia and Pacemaker Program at Rush University Medical Center in Chicago ... Sick sinus syndrome is the name for a group of arrhythmias involving the hearts natural pacemaker that can cause heart rhythms ... Most often, sick sinus syndrome occurs in people over the age of 50. Treatment may involve implanting a pacemaker to stabilize ...
The more likely interpretation is sinus arrhythmia, also very common in young people. In a longer strip, we might be able to ... One possibility is a sinus rhythm with PACs, which would not be unexpected in a young person. ...
The ECG Guru provides free resources for you to use. Help us keep the lights on and well keep bringing you the quality content that you love ...
Sinus Arrhythmia. A sinus arrhythmia is a change in the signal to SA node. The vagus nerve sends signals to the node. In some ... Ventricular Arrhythmias. Ventricular arrhythmias happen in the lower part of the heart. Arrhythmias in the lower heart can be ... Sick sinus can also cause long pauses in rhythm. The risk for sick sinus goes up as you get older. A pacemaker may be needed to ... Sick Sinus Syndrome. Sick sinus is an SA node that is not working as it should. It doesnt create a healthy, steady rhythm of ...
Sinus arrhythmia is one type of arrhythmia.. In this article, we look at what a sinus arrhythmia is, how it is diagnosed, and ... this article will focus on respiratory sinus arrhythmia.. Definition and types. Sinus arrhythmia does not relate to the sinus ... Respiratory sinus arrhythmia. Respiratory sinus arrhythmia is effectively benign, meaning that it is not harmful. It occurs ... including respiratory sinus arrhythmia.. Cases of respiratory sinus arrhythmia in children and young people will often improve ...
  • Respiratory sinus arrhythmia is a common type--an this is a normal process. (zocdoc.com)
  • Respiratory sinus arrhythmia is the natural variation of heart rate with breathing. (zocdoc.com)
  • Respiratory sinus arrhythmia normally occurs when heart rate slows during inspiration and speeds up in exhalation. (zocdoc.com)
  • Respiratory sinus arrhythmia (RSA) is being used increasingly in psychophysiological studies as an index of vagal control of the heart and may be among the most selective noninvasive indices of parasympathetic control of cardiac functions. (nih.gov)
  • The present study examines the mediation effect of heart rate variability-an affective measurement indexed by respiratory sinus arrhythmia (RSA)-in the relationship between specific math anxiety and arithmetic speed. (frontiersin.org)
  • HRV is composed of two major components: high frequency respiratory sinus arrhythmia (RSA) and low frequency sympathetic components. (psu.edu)
  • Respiratory sinus arrhythmia (RSA, or high-frequency heart-rate variability) is frequently employed as an index of cardiac vagal tone or even believed to be a direct measure of vagal tone. (nih.gov)
  • Respiratory Sinus Arrhythmia. (ahajournals.org)
  • This change is heart rate is called respiratory sinus arrhythmia (RSA). (dericbownds.net)
  • Resting respiratory sinus arrhythmia (RSA REST ) indexes important aspects of individual differences in emotionality. (dericbownds.net)
  • Across 4 studies, participants witnessed others suffer while we recorded physiological measures, including heart rate, respiration, skin conductance, and a measure of vagal activity called respiratory sinus arrhythmia (RSA). (dericbownds.net)
  • Respiratory Sinus Arrhythmia" is a descriptor in the National Library of Medicine's controlled vocabulary thesaurus, MeSH (Medical Subject Headings) . (sickkids.ca)
  • This graph shows the total number of publications written about "Respiratory Sinus Arrhythmia" by people in this website by year, and whether "Respiratory Sinus Arrhythmia" was a major or minor topic of these publications. (sickkids.ca)
  • Below are the most recent publications written about "Respiratory Sinus Arrhythmia" by people in Profiles. (sickkids.ca)
  • anticipatory heart rate change, primary bradycardia, and respiratory sinus arrhythmia. (elsevier.com)
  • Respiratory sinus arrhythmia did not discriminate between age groups but was suppressed during the performance of the oddball task relative to base level. (elsevier.com)
  • In addition, there is respiratory sinus arrhythmia - physiological phenomenon, which is especially noticeable during slow deep breathing and can be detected in any person. (medicalj-center.info)
  • Although different types of sinus arrhythmia will be covered, this article will focus on respiratory sinus arrhythmia. (doctorhq.com)
  • Respiratory sinus arrhythmia is effectively benign, meaning that it is not harmful. (doctorhq.com)
  • Respiratory sinus arrhythmia is more common in children than adults and tends to disappear, as they get older. (doctorhq.com)
  • In cases of respiratory sinus arrhythmia, the P-P interval will often be longer than 0.16 seconds when the person breathes out. (doctorhq.com)
  • In cases of respiratory sinus arrhythmia, the heart rate per minute is usually normal. (doctorhq.com)
  • Children who have respiratory sinus arrhythmia will tend to see their symptoms decrease, as they get older without the need for treatment. (doctorhq.com)
  • While the exact cause of respiratory sinus arrhythmia is not known, researchers believe it may occur to increase efficiency or allow the heart to do less work while maintaining the correct levels of blood gases. (doctorhq.com)
  • Sinuvil's active ingredients have been used safely for hundreds of years to support healthy sinus cavity, helping in reducing inflammation and support respiratory health. (farsimusic.net)
  • Sinus arrhythmia is usually a sinus rhythm with a rate that varies with respiration (respiratory sinus arrhythmia). (medchrome.com)
  • Respiratory Sinus Arrhythmia, the variation in the heart rate synchronized with the breathing cycle, forms an interconnection between cardiac-related and respiratory-related signals. (cvut.cz)
  • Both respiratory and non-respiratory sinus arrhythmia was observed amongst healthy adults. (westminster.ac.uk)
  • Bainbridge Reflex is involved in Respiratory Sinus Arrhythmia . (wikipedia.org)
  • The current study aimed to explore this further, investigating if respiratory sinus arrhythmia (RSA), a biomarker for emotion regulation and parasympathetic-mediated cardiac activity, was mediating the relationship between sleep and aggression among a sample of adolescents. (cuny.edu)
  • More importantly, simulated R-R intervals with different fractions and amplitude of respiratory sinus arrhythmia (RSA) components were examined to validate our hypothesis regarding the essentiality of RSA in the improvement of cardiovascular function, and its tight association with unpredictability and fractal property of HRV, which is in line with our hypothesis that RSA contributes significantly to the generation of the unpredictability and fractal behavior of HR dynamics. (elsevier.com)
  • Also, we provided the evidence to validate the critical role of respiratory sinus arrhythmia in the fractal properties of heart rate variability. (elsevier.com)
  • Therefore, in 97 volunteers, we derived 5 proposed indices (sequence method, α-index, transfer function, low-frequency transfer function, and impulse response function), compared them with arterial baroreflex gain (by the modified Oxford pharmacologic technique), and examined their relation to carotid distensibility and respiratory sinus arrhythmia. (ahajournals.org)
  • Forward stepwise linear regression showed that all spontaneous indices and baroreflex gain were related to respiratory sinus arrhythmia, but only baroreflex gain was related to carotid distensibility. (ahajournals.org)
  • Respiratory sinus arrhythmia (RSA) is known as fluctuations of heart rate associated with breathing . (bvsalud.org)
  • Baseline inter-beat interval and respiratory sinus arrhythmia (a measure of parasympathetic vagal tone) were measured in 35 women with the FMR1 premutation and 28 controls. (springer.com)
  • Respiratory sinus arrhythmia was reduced in the FMR1 premutation group relative to controls. (springer.com)
  • While depression symptoms were associated with reduced respiratory sinus arrhythmia among control women, these variables were unrelated in the FMR1 premutation. (springer.com)
  • Elevated FMR1 mRNA was associated with higher respiratory sinus arrhythmia. (springer.com)
  • Vagal tone can be estimated through descriptive measures of heart rate variability, as well as through the quantification of respiratory sinus arrhythmia (RSA), a measure of variability in the rise and fall of heart rate that occurs with respiration (see [ 5 ], for review). (springer.com)
  • Respiratory sinus arrhythmia (RSA) is typically a benign, normal variation in heart rate that occurs during each breathing cycle: the heart rate increases when breathing in and decreases when breathing out. (wikipedia.org)
  • Respiratory sinus arrhythmia is frequently used as a noninvasive method for investigating vagal tone, in physiological, behavioral, and several clinical studies. (wikipedia.org)
  • It is also worth noting that in old age a pronounced sinus arrhythmia may be a sign of infarction, and other diseases of the heart (which will be noticeable on EKG), and in alternation with significant bradycardia (decrease heart rate) is a neurosis that requires special treatment. (medicalj-center.info)
  • Sinus bradycardia, which is when the heart rate beats slower or less than 60 beats per minute. (doctorhq.com)
  • Some athletes with marked sinus bradycardia will exhibit periods of low atrial or junctional escape rhythms with rates of 40 to 60 bpm. (onlinejacc.org)
  • Evaluation of the athlete with sinus bradycardia includes a careful history to determine whether the athlete has symptoms related to the bradycardia. (onlinejacc.org)
  • however, when accompanied by symptoms, sinus bradycardia, sinoatrial exit block, and sick sinus syndrome with pauses at the termination of a supraventricular tachycardia (SVT) are considered abnormal. (onlinejacc.org)
  • An athlete with symptoms related to sinus bradycardia caused by high vagal tone related to training should restrict athletic training and have clinical reassessment of symptoms and sinus node function (1) . (onlinejacc.org)
  • Nonrespiratory sinus arrhythmia: Cardiac disease and myocardial infarction, especially in association with sinus bradycardia, digoxin therapy, or enhanced vagal tone. (medchrome.com)
  • ECG 2: What is Sinus Bradycardia? (medchrome.com)
  • The incidence, mechanism, and treatment of supraventricular arrhythmias (particularly sinus bradycardia, sinus tachycardia, and atrial fibrillation) occurring after myocardial infarction (MI) will be reviewed here. (uptodate.com)
  • Sinus bradycardia, defined as less than 50 to 60 beats/min, occurs in 15 to 25 percent of patients after acute MI [ 1-3 ]. (uptodate.com)
  • The diagnosis of Sick Sinus Syndrome requires looking into the symptoms that correlate with end organ hypoperfusion associated with bradycardia and or tachycardia. (medindia.net)
  • Sinus bradycardia is a type of slow heartbeat. (uclahealth.org)
  • In sinus bradycardia, the node fires less than 60 times per minute. (uclahealth.org)
  • Arrhythmias are can be caused by either slow heartbeats (bradycardia) or fast heartbeats (tachycardia). (medbroadcast.com)
  • Depending upon the needs of the body, it may beat faster (sinus tachycardia) due to stress or slower (sinus bradycardia) such as during sleep . (emedicinehealth.com)
  • Supraventricular arrhythmias happen in the structures above the ventricles, mainly the atria, the heart's two upper chambers. (texasheart.org)
  • Supraventricular arrhythmias, for instance, start in the upper chambers of the heart (the atria) and include atrial fibrillation (A-fib), Atrial Flutter, supraventricular tachycardia (SVT), and Wolff-Parkinson-White (WPW) syndrome. (mountsinai.org)
  • Supraventricular arrhythmias, other than atrial fibrillation or flutter, are relatively uncommon in the periinfarction period. (uptodate.com)
  • Patients with other supraventricular arrhythmias may be treated with adenosine, a calcium channel blocker, or a short-acting beta blocker to disrupt reentrant pathways. (aafp.org)
  • Part I discusses supraventricular arrhythmias. (aafp.org)
  • The ventricular responses in chronic or paroxysmal ectopic supraventricular arrhythmias were decreased at rest or during exercise. (ahajournals.org)
  • Generally speaking, those that do not originate from the ventricles are called supraventricular arrhythmias while those that come from the ventricles are called ventricular arrhythmias. (emedicinehealth.com)
  • The following are some of the more commonly encountered arrhythmias, starting with the supraventricular arrhythmias. (emedicinehealth.com)
  • I have always had normal sinus rhythm with periods of sinus tachycardia but never sinus arrhythmia or tons of PVC's and PAC's a minute. (medhelp.org)
  • Supraventricular tachycardia (SVT) is a type of arrhythmia where the heart beats too fast because of a glitch with the heart's electrical system originating in the two top chambers (atria). (rush.edu)
  • Sinus tachycardia, which is a faster heart rate, beating greater than 100 beats per minute. (doctorhq.com)
  • ECG 3: What is Sinus Tachycardia? (medchrome.com)
  • I was diagnosed with ectopic Atrial Tachycardia with a possible innapropriate sinus rhythm. (dailystrength.org)
  • Reentrant, automatic, or triggered mechanisms may cause ventricular arrhythmia (VA), just as these mechanisms cause supraventricular tachycardia (SVT) and other arrhythmias. (medscape.com)
  • At the other extreme of clinical presentation, not all adults with CHD and arrhythmia are symptomatic, and some experience symptoms so subtle that the amount of the day spent in tachycardia is not easily quantified. (bmj.com)
  • The arrhythmias that can often lead to death in minutes are ventricular fibrillation and ventricular tachycardia. (emedicinehealth.com)
  • What is sick sinus syndrome? (sharecare.com)
  • The condition is called "sick sinus syndrome. (sharecare.com)
  • Sick sinus syndrome is a heart-rhythm disturbance, or arrhythmia, that involves a group of symptoms, such as the heartbeat switching from too slow to too fast. (sharecare.com)
  • Collectively, the symptoms of sick sinus syndrome indicate that the sinoatrial node is not working properly. (sharecare.com)
  • Sick sinus syndrome is the name for a group of arrhythmias involving the heart's natural pacemaker that can cause heart rhythms to be too fast, too slow, and/or include long pauses. (rush.edu)
  • Most often, sick sinus syndrome occurs in people over the age of 50. (rush.edu)
  • Conclusions Our experience with antitachycardia pacemakers in CHD patients with post-operative sick sinus syndrome after biventricular correction or palliation shows that these devices are safe and that atrial pacing may play a role in AT prevention and treatment. (oup.com)
  • Sick sinus syndrome is not a disease condition but a clinical syndrome that is related to the sinoatrial node (SA node). (medindia.net)
  • In sick sinus syndrome, these signals do not follow a steady pace and the normal rhythm of the heart is disturbed . (medindia.net)
  • What are the Causes of Sick Sinus Syndrome? (medindia.net)
  • which are external factors that mimic or exacerbate sick sinus syndrome. (medindia.net)
  • What are the Symptoms and Signs of Sick Sinus Syndrome? (medindia.net)
  • The signs and symptoms of Sick Sinus syndrome are mostly seen in the age group of 50 years and above, in children it may be seen following an open heart surgery. (medindia.net)
  • What are the Various Types of Arrhythmias Seen in Sick Sinus Syndrome? (medindia.net)
  • Sick sinus syndrome is associated with both bradyarrhythmias and tachyarrhythmias. (medindia.net)
  • How do you Diagnose Sick Sinus Syndrome? (medindia.net)
  • Sinus arrhythmia is a commonly encountered variation of normal sinus rhythm. (wikipedia.org)
  • The word sinus means that the heart rhythm is coming from the sinus node--which is the starting point of the heart. (zocdoc.com)
  • A type of heart disease, arrhythmia causes our hearts to beat too fast, too slow or with an irregular rhythm. (sharecare.com)
  • Epicardial breakthrough waves (EBW) during atrial fibrillation are important elements of the arrhythmogenic substrate and result from endo-epicardial asynchrony, which also occurs to some degree during sinus rhythm (SR). We examined the incidence and characteristics of EBW during SR and its possible value in the detection of the arrhythmogenic substrate associated with atrial fibrillation. (ahajournals.org)
  • Sick sinus can also cause long pauses in rhythm. (epnet.com)
  • Arrhythmia is a fault in the heart's electrical system, which affects your heart's pumping rhythm. (heartfoundation.org.au)
  • Arrhythmias are a range of abnormalities in the heart's electrical system that controls its pumping rhythm. (heartfoundation.org.au)
  • The human heart in norm reduces to the correct sinus rhythm, which specifies the sinus node of the heart conduction system. (medicalj-center.info)
  • One possibility is a sinus rhythm with PACs, which would not be unexpected in a young person. (ecgguru.com)
  • An arrhythmia is when there is a problem with the heart's rhythm, or it beats irregularly. (doctorhq.com)
  • The sinus node is known as the heart's natural "pacemaker," meaning it is responsible for the rhythm of a person's heartbeats. (doctorhq.com)
  • Normal sinus rhythm is a regular rhythm found in healthy people. (doctorhq.com)
  • Sinus arrhythmia means there is an irregularity in the heart rhythm, originating at the sinus node. (doctorhq.com)
  • The most common way to diagnose arrhythmia is by taking an electrical recording of the heart rhythm, using a machine called an electrocardiogram (ECG or EKG). (doctorhq.com)
  • Any irregularity in your heart's natural rhythm is called an arrhythmia. (texasheart.org)
  • With this knowledge it is quite simple to recognize normal sinus rhythm on the ECG. (ecgpedia.org)
  • In most settings, however, the rhythm will be sinus. (ecgpedia.org)
  • If the rhythm is not sinus, the Arrhythmias algorithm should be followed. (ecgpedia.org)
  • An example of normal sinus rhythm. (ecgpedia.org)
  • Another example of normal sinus rhythm. (ecgpedia.org)
  • arrhythmia (ārĬŧħ´mēə) , disturbance in the rate or rhythm of the heartbeat. (encyclopedia.com)
  • arrhythmia (ă- ri th -miă) n. any deviation from the normal rhythm (sinus rhythm) of the heart. (encyclopedia.com)
  • An arrhythmia is any change to the heartbeat's normal rate or rhythm. (ohsu.edu)
  • The challenges for the family physician are to determine which arrhythmias are benign and which indicate probable cardiac malfunction, and to manage recurrent or chronic rhythm abnormalities. (aafp.org)
  • Part II discusses ventricular arrhythmias and the management of rhythm abnormalities in special populations, including pregnant women, athletes, and children. (aafp.org)
  • The first step in managing a patient with atrial fibrillation is to decide whether there is a high likelihood of safe conversion to sinus rhythm or whether the patient should be allowed to remain in atrial fibrillation. (aafp.org)
  • A patient with recent onset of atrial fibrillation (within the previous 12 months) and no evidence of enlargement of the left atrium has a greater chance of achieving and maintaining sinus rhythm. (aafp.org)
  • Conversion to sinus rhythm can be attempted by electrical shock or with antiarrhythmic drugs. (aafp.org)
  • The sinoatrial or sinus node is a group of specialized cells in the right upper chamber (atrium) of the heart that produces electric signals which regulate pace and rhythm of the heartbeat. (medindia.net)
  • Atrial fibrillation, supraventricular tachycardias, and sinus nodal arrhythmias are the rhythm abnormalities most commonly encountered by family physicians. (aafp.org)
  • Part II of this two-part article reviews the management of ventricular arrhythmias and approaches to rhythm disturbances in selected populations. (aafp.org)
  • An arrhythmia is a problem with the rate or rhythm of your heartbeat. (uclahealth.org)
  • An arrhythmia is an abnormal heart rhythm that can cause problems with the contractions of your heart chambers. (uclahealth.org)
  • The resulting muscle contraction outbreak: sinus node.differs from normal rhythm. (slideshare.net)
  • An arrhythmia is an abnormal rhythm of the heart, which can cause the heart to pump less effectively. (childrenshospital.org)
  • Electrocardiography (ECG) most commonly shows normal sinus rhythm in young patients, with an increasing occurrence of sinus-node dysfunction beginning in childhood and becoming more frequent with age. (medscape.com)
  • An arrhythmia occurs when the heart's regular rhythm changes, such as speeding up or slowing down, or when it beats irregularly. (medbroadcast.com)
  • Heart rhythm disorder is also referred to as an arrhythmia. (emedicinehealth.com)
  • The irregular beating results in a heart rhythm disorder, or arrhythmia. (emedicinehealth.com)
  • This state is called 'normal sinus rhythm' or 'normal rhythm' or 'normal heartbeat. (emedicinehealth.com)
  • What is an arrhythmia (heart rhythm disorder)? (emedicinehealth.com)
  • What are the more common types of arrhythmias (heart rhythm disorders)? (emedicinehealth.com)
  • Sinus rhythm was restored by defibrillation shock. (thefreelibrary.com)
  • What is the role of sinus rhythm restoration in the treatment of atrial fibrillation (Afib) (AF)? (medscape.com)
  • Restoration of sinus rhythm with regularization of the heart's rhythm improves cardiac hemodynamics and exercise tolerance. (medscape.com)
  • As AF contributes to pathologic atrial and ventricular remodeling, restoration of sinus rhythm can slow or, in some cases, reverse atrial dilatation and left ventricular dysfunction. (medscape.com)
  • For these reasons, most clinicians focus initially on restoration and maintenance of sinus rhythm in patients with new-onset AF and opt for a rate-control strategy only when rhythm control fails. (medscape.com)
  • However, several randomized controlled trials have demonstrated that a strategy aimed at restoring and maintaining sinus rhythm neither improves survival nor reduces the risk of stroke in patients with AF. (medscape.com)
  • Patients with this type of arrhythmia may not experience symptoms. (healthguideinfo.com)
  • When diagnosing a sinus arrhythmia the doctor will first discuss the patients symptoms with them and perform a physical exam. (healthguideinfo.com)
  • More detailed information about the symptoms , causes , and treatments of Phocomelia ectrodactyly deafness sinus arrhythmia is available below. (rightdiagnosis.com)
  • Whether you have symptoms and what those symptoms feel like depend on the health of your heart and the type of arrhythmia you have. (texasheart.org)
  • Symptoms also depend on how severe the arrhythmia is, how often it happens, and how long it lasts. (texasheart.org)
  • Some arrhythmias do not produce any symptoms. (texasheart.org)
  • Athletes with symptoms potentially associated with these arrhythmias should have an ECG, 24-hour ambulatory monitoring, and an exercise test. (onlinejacc.org)
  • Most arrhythmias are harmless and cause no symptoms. (ohsu.edu)
  • Symptoms vary depending on the type of arrhythmia. (ohsu.edu)
  • Family physicians frequently encounter patients with symptoms that could be related to cardiac arrhythmias, most commonly atrial fibrillation or supraventricular tachycardias. (aafp.org)
  • In some cases where the ECG cannot confirm the diagnosis a 24 to 48 hour cardiac monitoring may be required in the hospital or using an ambulatory cardiac monitoring device like the Holter monitor to check if arrhythmias are associated with other symptoms. (medindia.net)
  • However, if they are highly irregular or result from a weak or damaged heart, arrhythmias can cause severe and potentially fatal symptoms and complications. (medicalnewstoday.com)
  • In this article, we define arrhythmia, as well as its causes and symptoms. (medicalnewstoday.com)
  • What are the symptoms of an arrhythmia? (childrenshospital.org)
  • Some arrhythmias cause no symptoms. (childrenshospital.org)
  • Coronary sinus ASDs usually do not cause clinically significant symptoms in childhood. (medscape.com)
  • Surgical closure in childhood is the recommended therapy for secundum ASDs (among the most common lesions found with partial fenestrations of the coronary sinus) with clinically significant left-to-right shunts associated with cardiomegaly, symptoms, or both. (medscape.com)
  • Not all arrhythmias will cause symptoms. (stdavids.com)
  • When arrhythmias cause symptoms serious enough to affect your daily life or increase the risk of other conditions, treatment may be needed. (stdavids.com)
  • Left ventricular noncompaction (LVNC) is a rare congenital cardiomyopathy with a clinical presentation that ranges from no symptoms to sudden cardiac death due to fatal arrhythmia or heart failure. (thefreelibrary.com)
  • Because of the sepsis-like presentation of the infant with suspicious CSF-findings and cardiac arrhythmia a viral infection was suspected. (clinmedjournals.org)
  • Atrial fibrillation is the most common cardiac arrhythmia family physicians are likely to encounter. (aafp.org)
  • Cardiac arrhythmia is a group of conditions in which the muscle contraction of the heart is irregular or is faster or slower than normal. (dailystrength.org)
  • Cardiac arrhythmia refers to a group of conditions that cause the heart to beat irregular, too slowly, or too quickly. (medicalnewstoday.com)
  • 1. This Article Has Been Brought to You for Free by WHAT IS www.freud-sigmund.com CARDIAC ARRHYTHMIA atrioventricular node, the junction between the atria and ventricles. (slideshare.net)
  • Conclusion: High dose magnesium sulphate administration was found to be helpful for cardiac arrhythmia and shock but mortality remained unchanged. (thefreelibrary.com)
  • I'd be interested to get some further details about the sinus arrhythmia diagnosis. (medhelp.org)
  • This sinus node is the heart's 'pacemaker. (zocdoc.com)
  • At the Rush Electrophysiology, Arrhythmia and Pacemaker Program, you'll find electrophysiologists who specialize in caring for heartbeat irregularities and provide second opinions. (rush.edu)
  • This arrhythmia occurs because of a problem with your heart's natural pacemaker (sinus node), a part of its electrical system. (heartfoundation.org.au)
  • Think of it like the electrical wiring in your home: The sinoatrial node, or sinus node, is the heart's natural pacemaker. (ohsu.edu)
  • The term sinus arrhythmia refers to a normal phenomenon of mild acceleration and slowing of the heart rate that occurs with breathing in and out. (medhelp.org)
  • This arrhythmia occurs when your heart misses a beat or adds an extra beat. (heartfoundation.org.au)
  • Atrial Fibrillation, also called AFib, is the most common form of arrhythmia and occurs more frequently as we age. (mountsinai.org)
  • An arrhythmia occurs when there is a problem with the electrical system that is supposed to regulate a steady heartbeat. (uclahealth.org)
  • Interatrial shunting occurs through the defect in the wall on the left atrial side, which is continuous with the orifice of the coronary sinus opening on the right atrial side of the septum. (medscape.com)
  • Primary prevention of atrial fibrillation: does the atrial lead position influence the incidence of atrial arrhythmias in patients with sinus node dysfunction? (semanticscholar.org)
  • Aims The objective of our study was to evaluate the clinical outcome of patients with operated congenital heart disease (CHD), post-operative sinus node dysfunction and atrial tachyarrhythmias (AT) who had a new generation of DDDRP pacemakers (Model AT501, Medtronic Inc., MN, USA) able to deliver preventive atrial pacing and antitachycardia pacing (ATP) therapies. (oup.com)
  • It is also referred to as sinus node disease or sinus node dysfunction. (medindia.net)
  • These arrhythmias include re-entrant atrial and ventricular tachycardias, heart block, and sinus node dysfunction. (bmj.com)
  • A broad range of variations in heart rates and rhythms, specific cardiac arrhythmias, and atrioventricular (AV) and intraventricular conduction disturbances are observed in athletes. (onlinejacc.org)
  • Regular consumption of coffee has been found to effectively lower the risk of irregular heart rhythms also known as arrhythmia. (medindia.net)
  • This invention relates to devices which detect and/or treat tachyarrhythmias (rapid heart rhythms), and more specifically, to the operation of arrhythmia prevention pacing modes which vary the pacing rate on a beat by beat basis in such devices. (google.com)
  • Moreover, by exploiting the enhanced specificity in the origin of the identified arrhythmia, the detection architecture can better discriminate between rhythms appropriate for device therapy and those that are not. (google.com)
  • Wrongly Diagnosed with Phocomelia ectrodactyly deafness sinus arrhythmia? (rightdiagnosis.com)
  • Fibrillation , the most serious form of arrhythmia, is fast, uncoordinated beats, which are contractions of individual heart-muscle fibers. (texasheart.org)
  • This is the most dangerous form of arrhythmia. (medbroadcast.com)
  • Sinus arrhythmia characteristically presents with an irregular rate in which the variation in the R-R interval is greater than 0.12 seconds. (wikipedia.org)
  • The word arrhythmia means that the heart rate is irregular--not a constant rate. (zocdoc.com)
  • At Mount Sinai Heart, we treat many types of irregular heartbeats, or arrhythmias. (mountsinai.org)
  • An arrhythmia describes an irregular heartbeat. (medicalnewstoday.com)
  • Sinus tachycardias were regularly slowed. (ahajournals.org)
  • This includes arrhythmias that originate from the sinus node, the atrial tissue (atrial flutter and atrial tachycardias), and the AV node. (clinicaladvisor.com)
  • Arrhythmias occur when the electrical signals that coordinate heartbeats are not working correctly. (medicalnewstoday.com)
  • Arrhythmias occur when there is a problem with the electrical signals that control the heartbeat. (childrenshospital.org)
  • All arrhythmias prevalent in the normal population may also occur in CHD, and some specific associations are observed-for example, Wolff-Parkinson-White syndrome and Ebstein's anomaly. (bmj.com)
  • It can help find arrhythmias that do not occur in a regular pattern. (stdavids.com)
  • These types of arrhythmias occur in the atria, the upper chambers of the heart. (portsmouthhospital.com)
  • The following related topics are discussed separately: conduction disturbances after MI, pathophysiology of ventricular arrhythmias during MI, the clinical characteristics and treatment of ventricular arrhythmias with MI, and risk stratification of patients after MI. (uptodate.com)
  • what does sinus arrhythmia non specific intraventricular conduction delay mean? (medhelp.org)
  • The same approach applies to the sinus arrhythmia commonly observed in the athlete. (onlinejacc.org)
  • Background Ventricular arrhythmias (VAs) originating from ventricular outflow tracts can possess a high similarity of QRS configuration resulting in an inaccurate localization, while the reminder of mapping or ablation in the lower right ventricular outflow tract (RVOT) commonly provide the preferred transformation strategy. (authorea.com)
  • Congenital heart malformations commonly associated with arrhythmia. (bmj.com)
  • Rarely, sinus arrhythmia is not associated with respiration (nonrespiratory sinus arrhythmia). (medchrome.com)
  • There are many types of heart arrhythmias. (epnet.com)
  • There are several types of heart arrhythmias depending on which part of the heart or nerve pathway is damaged. (portsmouthhospital.com)
  • Arrhythmias are caused by a problem with the electrical signals that control the heartbeat. (ohsu.edu)
  • Some arrhythmias may be felt as a fluttering in the chest, skipped heartbeat, or fast heartbeat. (stdavids.com)
  • There are many types of arrhythmia that originate in other electrical pathways of the heart. (doctorhq.com)
  • Anextra systole interrupts normal Atria arrhythmias originate in the atria:sequence of activation of cardiac - Ectopic atria - ectopic impulsesmuscle. (slideshare.net)
  • Physiological sinus arrhythmia (ie, normal variant) is quite common in childhood and adolescence that is associated with the development of the boys hormonal and temporary imbalance in the functioning of the vegetative nervous system. (medicalj-center.info)
  • Some people are born with arrhythmias, meaning the condition is congenital. (texasheart.org)
  • Although the anatomical classification of congenital heart defects is complex, three major categories constitute a large percentage of adult CHD patients with arrhythmia, because of their frequency and high incidence of arrhythmia (fig 1). (bmj.com)
  • There are also inherited and congenital (present since birth) types of arrhythmia, often resulting in a weak or late signal getting to the ventricles. (medbroadcast.com)
  • The distinction between normal variants, often exaggerated by the specific physiology of the conditioned athlete, and arrhythmias that may be symptomatic or life-threatening may be significant challenges. (onlinejacc.org)
  • The surgical treatment of an isolated coronary sinus ASD is complicated by its proximity to the atrioventricular node. (medscape.com)
  • The term "ventricular bigeminy" refers to alternating normal sinus and premature ventricular complexes. (aafp.org)
  • In the absence of heart disease, premature ventricular complexes are associated with little or no increased risk of developing a dangerous arrhythmia. (aafp.org)
  • Others classify arrhythmias as one of four types -- premature beats, supraventricular, ventricular, and bradyarrhythmias. (emedicinehealth.com)
  • Invasive electrophysiology studies (EPS) play a very limited role in the assessment of sinus node function. (onlinejacc.org)
  • The Electrophysiology Service at Boston Children's Hospital specializes in diagnosing and treating heart arrhythmias in children and young adults. (childrenshospital.org)
  • Arrhythmias can be divided into two categories: ventricular and supraventricular. (texasheart.org)
  • Ablation can be used to destroy the arrhythmias site. (healthguideinfo.com)
  • It may also be treated by catheter ablation, in which an electrode produces heat to destroy cells causing the arrhythmia. (encyclopedia.com)
  • Dr. Krokhaleva's clinical interests include all aspects of arrhythmia management with particular emphasis on cardiac catheter ablation of atrial and ventricular arrhythmias as well as cardiac implantable devices. (uclahealth.org)
  • If you have an arrhythmia, your healthcare provider may recommend a procedure called catheter ablation. (uclahealth.org)
  • All patients had a QRS morphology of the LBBB pattern and an inferior axis, with the mean earliest ventricular activation (EVA) of target site of 34.9 ± 8.8ms. 37 (30.8%), 60 (50.0%), and 23 (19.2%) patients obtained the successful RF ablation at the right sinus cusp (RCC), left sinus cusp (LCC), and the commissure of RCC and LCC (R-LCC), respectively. (authorea.com)
  • These are a group of arrhythmias caused by abnormal electrical activity in the heart's atria. (heartfoundation.org.au)
  • To generate a list of potential genetic markers that correlate with an increased risk of life-threatening arrhythmias. (clinicaltrials.gov)
  • Positive predictive value of single nucleotide polymorphisms as predictors of life-threatening arrhythmias. (clinicaltrials.gov)
  • Association between risk factors identified in the CRF and life-threatening arrhythmias. (clinicaltrials.gov)
  • Association between ECG-based risk markers and life-threatening arrhythmias. (clinicaltrials.gov)
  • The primary objective is to establish the role of genetics in life-threatening arrhythmias leading to sudden cardiac death (SCD) and the potential utility of genetic markers in risk stratification of patients to receive an implantable cardiac defibrillator (ICD). (clinicaltrials.gov)
  • to study the association between parameters derived from Holter recordings and predictors of life-threatening arrhythmias. (clinicaltrials.gov)
  • Several studies 1 , 2 have demonstrated an increased risk for life-threatening arrhythmias with 10 or more ectopic impulses per hour or the presence of impulse salvos (i.e., three to five consecutive impulses). (aafp.org)
  • High blood pressure and an overactive thyroid gland also increase the chances of arrhythmias. (medbroadcast.com)
  • Sinus arrhythmia does not relate to the sinus cavities in the face but to the sinoatrial or sinus node in the heart. (doctorhq.com)
  • The sinoatrial or sinus node is located in the upper chamber on the right side of the heart, which is called the right atrium. (doctorhq.com)
  • Accordingly we aimed this retrospective study to: (1) evaluate the suitability of the standard coronary angiography to study the SNA and (2) determine if the percentage of subjects with a positive retrospective history of supra-ventricular arrhythmias (SVA) differs in patients with normal and diseased SNA ascertained at the time of coronary angiography. (peerj.com)
  • METHOD The atrial lead position is randomized to: (a) free right atrial wall, (b) right atrial appendage (RAA), (c) coronary sinus ostium (CS-Os), or (d) dual site right atrial pacing (CS-Os + RAA). (semanticscholar.org)
  • Coronary sinus atrial septal defects (ASDs) are not true defects of the atrial septum. (medscape.com)
  • [ 1 ] They are characterized by the absence of at least a portion of the common wall that separates the coronary sinus and the left atrium. (medscape.com)
  • Coronary sinus defects are often associated with a persistent left superior vena cava (SVC) that drains into the coronary sinus. (medscape.com)
  • Isolated coronary sinus ASDs are associated with a low rate of morbidity and mortality. (medscape.com)
  • The following laboratory studies are helpful for the workup of isolated coronary sinus ASDs. (medscape.com)
  • The same recommendations hold true for coronary sinus ASDs. (medscape.com)
  • INTRODUCTION PASTA (pacing of the atria in sinus node disease) is a prospective and randomized trial, assessing the effect of different atrial lead positions on the atrial fibrillation (AF) incidence in patients with sinus node disease (SND). (semanticscholar.org)
  • The successful accomplishment of this goal would serve as the basis for future work on a specific diagnostic test that can be used to assess risks of threatening arrhythmias in order to quality patients for implantation of an ICD. (clinicaltrials.gov)
  • More often, patients have chronic arrhythmias, such as atrial fibrillation, that may require treatment to reduce the risk of future complications. (aafp.org)
  • The median age of patients with atrial fibrillation is 75 years, and the prevalence of the arrhythmia doubles every 10 years after the age of 55. (aafp.org)
  • A major area for future research will be a clarification of the natural history of arrhythmia in these patients, with attention paid to their role in the gradual deterioration of older patients with CHD. (bmj.com)
  • The effects of intravenous and oral administration of propranolol, an adrenergic beta-receptor blocking agent, have been studied in 29 patients with various cardiac arrhythmias. (ahajournals.org)
  • Patients were observed for cardiac arrhythmias and mortality in both groups. (thefreelibrary.com)
  • All of my EKG's have been normal except for one that showed sinus arrhythmia and one that had a PAC. (medhelp.org)
  • Some arrhythmias are very minor and can be regarded as variants of normal. (medhelp.org)
  • One of the violations of the normal activities of the heart is the sinoatrial (or sinus) arrhythmia. (medicalj-center.info)
  • As mentioned above, sinus arrhythmia is often a normal variant, but may be the manifestation of a number of pathological conditions. (medicalj-center.info)
  • This is a normal phenomenon, and these will become suppressed with exercise-induced increases in the sinus rate. (onlinejacc.org)
  • These actions are guided by the Variations in heart rate are normal in some cases.sinus node, located in the right atrium. (slideshare.net)
  • However, more common are acquired arrhythmias that are rarely seen in normal young adult hearts, and that are associated with longstanding hypertrophy and fibrosis caused by cyanosis, chronic haemodynamic overload, and superimposed surgical scarring. (bmj.com)
  • The normal beating of the heart is controlled by electrical signals sent from a particular segment of heart muscle tissue called the sinus node . (medbroadcast.com)
  • The words arrhythmia and dysrhythmia mean the same, but the word arrhythmia is more prevalent. (medicalnewstoday.com)
  • An electrocardiogram (ECG) may be used to diagnose arrhythmia. (doctorhq.com)
  • Although these arrhythmias are usually benign, they can indicate significant underlying heart disease. (aafp.org)
  • Ventricular arrhythmia (VA) may be an isolated and completely benign finding in children, a marker of serious systemic disease or myopathy, or a mechanism for syncope and sudden cardiac death (SCD). (medscape.com)
  • This arrhythmia is caused by abnormal electrical activity in the heart's ventricles. (heartfoundation.org.au)
  • Ventricular arrhythmias happen in the heart's two lower chambers, the ventricles. (texasheart.org)
  • Arrhythmias are classified by the part of the heart where they begin - the upper chambers (atria) or lower chambers (ventricles). (ohsu.edu)
  • One way arrhythmias are defined is by whether they start in the upper chambers (atria) or lower chambers (ventricles). (ohsu.edu)
  • Arrhythmias are classified by the area of the heart where they start: the upper chambers (atria) or lower chambers (ventricles). (childrenshospital.org)
  • There are many different kinds of arrhythmias, but those that affect the ventricles are generally more serious than arrhythmias of the atria. (medbroadcast.com)
  • People with heart disease are particularly likely to develop arrhythmias, since damage to the heart can stop the beat signal from reaching the ventricles or cause certain areas of the heart to fire abnormally. (medbroadcast.com)
  • The ventricles can emit their own signal, but this is often fewer than 40 beats a minute instead of the usual 60 to 100 with the sinus node. (medbroadcast.com)
  • There are many types of arrhythmias, and they are classified by some researchers and doctors by where they begin in the heart (the atria, AV node, or the ventricles). (emedicinehealth.com)
  • Functional endoscopic sinus surgery (FESS) is indicated in diseases such as chronic sinusitis refractory to medical treatment, nasal polyposis, mass lesions in the nasal cavity. (clinicaltrials.gov)
  • This test is most often used to determine the origin of the arrhythmia to help to doctor determine the best treatment method. (healthguideinfo.com)
  • After treatment of these pathologies arrhythmia usually disappears, and the heart again begins to beat properly. (medicalj-center.info)
  • OHSU Doernbecher Children's Hospital provides advanced testing and an array of treatment options for children with an arrhythmia. (ohsu.edu)
  • With treatment, an arrhythmia is rarely life-threatening. (ohsu.edu)
  • Not all arrhythmias need treatment, and many that do can be cured or well controlled. (ohsu.edu)
  • If the arrhythmia is long-standing and the patient is not a suitable candidate for rate cardioversion, initial treatment should focus on ventricular rate control, with consideration given to long-term stroke prophylaxis. (aafp.org)
  • Treatment of arrhythmias in pregnant women is rarely needed. (aafp.org)
  • Their prevalence and the difficulty of treatment have made arrhythmia a major focus of interest for physicians working in this area. (bmj.com)
  • Six instances of digitalis-induced arrhythmias were responsive to treatment. (ahajournals.org)
  • The type of treatment will depend on your specific arrhythmia and your overall health. (denverhealth.org)
  • Successful Treatment of an Infant with Left Ventricular Noncompaction Presenting with Fatal Ventricular Arrhythmia Treated with Cardiac Resynchronization Therapy and an Implantable Cardioverter Defibrillator. (thefreelibrary.com)
  • Sinus arrhythmia is a common condition. (zocdoc.com)
  • AFib is the most common type of arrhythmia. (epnet.com)
  • Read more about atrial fibrillation, the most common arrhythmia. (heartfoundation.org.au)
  • As mentioned above, sinus arrhythmia in children is common, and the vertical position EOS (electrical axis of the heart) is typical for people of slim build, with which mostly are children. (medicalj-center.info)
  • The more likely interpretation is sinus arrhythmia, also very common in young people. (ecgguru.com)
  • Sinus arrhythmias are common in children and are sometimes found in adults as well. (doctorhq.com)
  • Arrhythmias can affect people of any age, although atrial fibrillation is more common in older people. (doctorhq.com)
  • Although arrhythmias are more common in adults, they can affect children of all ages, including babies in the womb. (ohsu.edu)
  • This is part I of a two-part article on common arrhythmias. (aafp.org)
  • Heart palpitations and cardiac arrhythmias are common problems encountered by family physicians. (aafp.org)
  • This two-part article reviews common atrial and ventricular arrhythmias, with a focus on initial management decisions. (aafp.org)
  • This article will review the evaluation and management of these more common arrhythmia problems in adults with CHD. (bmj.com)
  • AF is the most common form of harmful arrhythmia, affecting almost 1% of the population. (medbroadcast.com)
  • This arrhythmia is a very common occurrence in all ages and usually is not serious. (emedicinehealth.com)
  • This arrhythmia is common in children and often found in adults, but is generally harmless. (portsmouthhospital.com)
  • Atrial fibrillation (AF or AFib) is the most common type of heart arrhythmia. (portsmouthhospital.com)
  • Acute arrhythmias in children with Wolff-Parkinson-White syndrome can be treated with adenosine. (aafp.org)