Accessory Atrioventricular Bundle: Extra impulse-conducting tissue in the heart that creates abnormal impulse-conducting connections between HEART ATRIA and HEART VENTRICLES.Bundle of His: 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.Atrioventricular Node: 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.Heart Conduction System: 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.Accessory Nerve: The 11th cranial nerve which originates from NEURONS in the MEDULLA and in the CERVICAL SPINAL CORD. It has a cranial root, which joins the VAGUS NERVE (10th cranial) and sends motor fibers to the muscles of the LARYNX, and a spinal root, which sends motor fibers to the TRAPEZIUS and the sternocleidomastoid muscles.Heart: The hollow, muscular organ that maintains the circulation of the blood.Heart Septal Defects: Abnormalities in any part of the HEART SEPTUM resulting in abnormal communication between the left and the right chambers of the heart. The abnormal blood flow inside the heart may be caused by defects in the ATRIAL SEPTUM, the VENTRICULAR SEPTUM, or both.Myocardium: 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.Tricuspid Valve: The valve consisting of three cusps situated between the right atrium and right ventricle of the heart.Heart Atria: The chambers of the heart, to which the BLOOD returns from the circulation.Verapamil: A calcium channel blocker that is a class IV anti-arrhythmia agent.Meningioma: A relatively common neoplasm of the CENTRAL NERVOUS SYSTEM that arises from arachnoidal cells. The majority are well differentiated vascular tumors which grow slowly and have a low potential to be invasive, although malignant subtypes occur. Meningiomas have a predilection to arise from the parasagittal region, cerebral convexity, sphenoidal ridge, olfactory groove, and SPINAL CANAL. (From DeVita et al., Cancer: Principles and Practice of Oncology, 5th ed, pp2056-7)Meningeal Neoplasms: Benign and malignant neoplastic processes that arise from or secondarily involve the meningeal coverings of the brain and spinal cord.Diltiazem: A benzothiazepine derivative with vasodilating action due to its antagonism of the actions of CALCIUM ion on membrane functions.Sarcoma, Experimental: Experimentally induced neoplasms of CONNECTIVE TISSUE in animals to provide a model for studying human SARCOMA.Hydroxyurea: An antineoplastic agent that inhibits DNA synthesis through the inhibition of ribonucleoside diphosphate reductase.Calcium Channel Blockers: A class of drugs that act by selective inhibition of calcium influx through cellular membranes.Wolff-Parkinson-White Syndrome: 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.Ventricular Premature Complexes: 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.Vectorcardiography: Recording of the moment-to-moment electromotive forces of the heart on a plane of the body surface delineated as a vector function of time.Electrocardiography: 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.Pre-Excitation Syndromes: A group of conditions in which HEART VENTRICLE activation by the atrial impulse is faster than the normal impulse conduction from the SINOATRIAL NODE. In these pre-excitation syndromes, atrial impulses often bypass the ATRIOVENTRICULAR NODE delay and travel via ACCESSORY CONDUCTING PATHWAYS connecting the atrium directly to the BUNDLE OF HIS.Tachycardia, Atrioventricular Nodal Reentry: 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.Catheter Ablation: 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.Tachycardia, Supraventricular: A generic expression for any tachycardia that originates above the BUNDLE OF HIS.Tachycardia, Paroxysmal: Abnormally rapid heartbeats with sudden onset and cessation.Tachycardia, Ectopic Atrial: 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.Tachycardia: 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.Tachycardia, Ventricular: 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).Computer-Assisted Instruction: A self-learning technique, usually online, involving interaction of the student with programmed instructional materials.Arrhythmias, Cardiac: 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.Anatomy: A branch of biology dealing with the structure of organisms.Biological Science Disciplines: All of the divisions of the natural sciences dealing with the various aspects of the phenomena of life and vital processes. The concept includes anatomy and physiology, biochemistry and biophysics, and the biology of animals, plants, and microorganisms. It should be differentiated from BIOLOGY, one of its subdivisions, concerned specifically with the origin and life processes of living organisms.Audiovisual Aids: Auditory and visual instructional materials.Cardiac Imaging Techniques: Visualization of the heart structure and cardiac blood flow for diagnostic evaluation or to guide cardiac procedures via techniques including ENDOSCOPY (cardiac endoscopy, sometimes refered to as cardioscopy), RADIONUCLIDE IMAGING; MAGNETIC RESONANCE IMAGING; TOMOGRAPHY; or ULTRASONOGRAPHY.Heart Rate: The number of times the HEART VENTRICLES contract per unit of time, usually per minute.Autonomic Nervous System: 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.Death, Sudden, Cardiac: 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)Myocardial Infarction: NECROSIS of the MYOCARDIUM caused by an obstruction of the blood supply to the heart (CORONARY CIRCULATION).Heart Sounds: The sounds heard over the cardiac region produced by the functioning of the heart. There are four distinct sounds: the first occurs at the beginning of SYSTOLE and is heard as a "lubb" sound; the second is produced by the closing of the AORTIC VALVE and PULMONARY VALVE and is heard as a "dupp" sound; the third is produced by vibrations of the ventricular walls when suddenly distended by the rush of blood from the HEART ATRIA; and the fourth is produced by atrial contraction and ventricular filling.Catheters, Indwelling: Catheters designed to be left within an organ or passage for an extended period of time.Catheters: A flexible, tubular device that is used to carry fluids into or from a blood vessel, hollow organ, or body cavity.Phonocardiography: Graphic registration of the heart sounds picked up as vibrations and transformed by a piezoelectric crystal microphone into a varying electrical output according to the stresses imposed by the sound waves. The electrical output is amplified by a stethograph amplifier and recorded by a device incorporated into the electrocardiograph or by a multichannel recording machine.Heart Auscultation: Act of listening for sounds within the heart.Catheterization, Central Venous: Placement of an intravenous CATHETER in the subclavian, jugular, or other central vein.Atrial Septum: The thin membrane-like muscular structure separating the right and the left upper chambers (HEART ATRIA) of a heart.Endocardium: The innermost layer of the heart, comprised of endothelial cells.American Nurses' Association: Professional society representing the field of nursing.Atrial Fibrillation: 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.Digoxin: 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)ArchivesPeriodicals as Topic: A publication issued at stated, more or less regular, intervals.PubMed: A bibliographic database that includes MEDLINE as its primary subset. It is produced by the National Center for Biotechnology Information (NCBI), part of the NATIONAL LIBRARY OF MEDICINE. PubMed, which is searchable through NLM's Web site, also includes access to additional citations to selected life sciences journals not in MEDLINE, and links to other resources such as the full-text of articles at participating publishers' Web sites, NCBI's molecular biology databases, and PubMed Central.Cardiac Electrophysiology: The study of the electrical activity and characteristics of the HEART; MYOCARDIUM; and CARDIOMYOCYTES.Directories as Topic: Lists of persons or organizations, systematically arranged, usually in alphabetic or classed order, giving address, affiliations, etc., for individuals, and giving address, officers, functions, and similar data for organizations. (ALA Glossary of Library and Information Science, 1983)

Differences in accessory pathway location by sex and race. (1/29)

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Should sevoflurane be used in the electrophysiology assessment of accessory pathways? (2/29)

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Atrial asystole during ventricular pacing following radiofrequency catheter ablation of accessory pathways. (3/29)

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A case for ambidextrous doctors. (4/29)

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Reversion of left ventricular systolic dysfunction and abnormal stress test: by catheter ablation, in a patient with Wolff-Parkinson-White syndrome from Para-Hisian Kent bundle. (5/29)

The diagnosis of Wolff-Parkinson-White syndrome is typically reserved for patients who experience ventricular pre-excitation and symptoms that are related to paroxysmal supraventricular tachycardia, such as chest pain, dyspnea, dizziness, palpitations, or syncope. Herein, we report the case of a 38-year-old woman who presented at our outpatient department because of exercise intolerance. Cardiac auscultation revealed a grade 2/6 pansystolic murmur over the left lower sternal border. Twelve-lead electrocardiography showed sinus rhythm at a rate of 76 beats/min, with a significant delta wave. Transthoracic echocardiography revealed abnormal left ventricular systolic function. The results of a thallium stress test were also abnormal. Coronary artery disease was suspected; however, coronary angiography yielded normal results. Electrophysiologic study revealed a para-Hisian Kent bundle and a dual atrioventricular nodal pathway. After radiofrequency catheter ablation was performed, the patient's left ventricular function improved and her symptoms disappeared. In Wolff-Parkinson-White syndrome, left ventricular systolic dyssynchrony can yield abnormal findings on echocardiography and thallium scanning--even in persons who have no cardiovascular risk factors. Physicians who are armed with this knowledge can avoid performing coronary angiography unnecessarily. Catheter ablation can reverse the dyssynchrony of the ventricle and improve the patient's symptoms.  (+info)

Symptomatic improvement after catheter ablation of supraventricular tachycardia measured by the arrhythmia-specific questionnaire U22. (6/29)

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Isoproterenol administration during general anesthesia for the evaluation of children with ventricular preexcitation. (7/29)

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Quadruple atrioventricular nodal pathways: involved in orthodromic atrioventricular reentrant tachycardia. (8/29)

Supraventricular tachycardia can be caused by multiple atrioventricular nodal pathways or atrioventricular accessory pathways. Herein, we report the case of a patient who was diagnosed with an orthodromic atrioventricular reentrant tachycardia that was caused by an unusual combination of quadruple atrioventricular nodal pathways and an atrioventricular accessory pathway. Radiofrequency catheter ablation of the accessory pathway successfully eliminated the arrhythmias and the patient's symptoms. Careful analysis of complete electrophysiologic studies can help in the diagnosis of such rare clinical presentations.  (+info)

1999-05-13. Ian Musgrave:. You have to consider a number of factors in calculating how far a molecule can move across a cell, charge and non-sphericity of some molecules for example.. Why should being not spherical lead to a substantial increase in the mean path per unit of time? Only in case of a voltage gradient, charges could have substantial effects over distances longer than the molecule sizes. Such a voltage gradient however would affect all charged molecules.. Also, the collision radius is 4 times the particle radius, partly due to water cage effects.. If thats true, then it is very strong evidence for my claim that enzymes are able to perceive their surroundings (see The Nature of Life).. Imagine a spherical enzyme with a radius of 2 nm, a volume of around 34 cubic nanometers and a surface of around 50 square nm. The active site may have a surface of 4 square nanometers. If the collision radius is 4 times the particle radius, we must conclude that the active site can perceive a ...
An electrophysiology study is performed to evaluate the electrical activity of the heart. The purpose of the electrical system of the heart is to coordinate the pumping of the four chambers of the heart and to control the heart rate so that the heart speeds up and slows down as the demands of the body change. The SA node starts the electrical signal. The electrical signal then travels through the atria causing them to contract. Then it passes through the AV node the bundle of His, and bundle branches and then out to the muscle fibers of the ventricles. As the impulse spreads, the muscles contract and the ventricles pump. To perform an electrophysiology study, three to five electrically sensitive catheters are placed inside the heart to record electrical activity (see fig. 2 and 3). These recordings locate abnormal tissue that causes irregularities in the heartbeat (arrhythmias).. ...
Electrophysiology study is an advanced evaluation of heart rhythm disorders. It is usually resorted to in cases where simple medications are not effective in controlling the rhythm abnormalities. Generally it is done without any sedation or general anaesthesia as it is not very painful. Local anaesthesia is given at the sites where the blood vessels are punctured to introduce small electrodes into the various chambers of the heart for recording the electrical activity of the heart internally. Each electrode has multiple recording poles - bipolar with two recording poles, quadripolar with four recording poles, decapolar with ten recording poles and duo-decapolar with 20 electrode poles.. The signals from the electrodes reach a junction box from where it reaches recorder which also displays multiple simultaneous channels on a screen. The signals can be electronically archived on a hard disc or printed on a calibrated recording paper. By analysing the sequence in which signals arrive at each ...
An electrophysiology study is performed by a cardiologist, usually as a day procedure, at Epworth Hospital. It involves guiding a catheter containing electrodes to the heart with the aid of x-ray imaging. The electrodes detect the electrical activity of the heart and help diagnose irregular or abnormal heart rhythms. ...
List of 3 doctors offering Intracardiac Electrophysiology Study (EPS) in Manchester. Check out patient reviews, addresses and book a visit!
Learn more about Electrophysiology Study at Westside Regional Medical Center DefinitionReasons for ProcedurePossible ComplicationsWhat to ExpectCall Your Doctorrevision ...
Have any of you had an Electrophysiology Study before? Is there anything we should know before my husband agrees to having it done? Thank you in advance.
Electrophysiology Study (EPS) clinics in Domis de Semerpontlaan at the best price. Find doctors, specialized in Cardiology and compare prices, costs and reviews.
Electrophysiology Studies This is a test to look at how well the hearts electrical signals are working. It is used to check for abnormal heartbeats or
An apparatus and method for reversing ventricular remodeling with electro-stimulatory therapy. A ventricle is paced by delivering one or more stimulatory pulses in a manner such that a stressed region of the myocardium is pre-excited relative to other regions in order to subject the stressed region to a lessened preload and afterload during systole. The unloading of the stressed myocardium over time effects reversal of undesirable ventricular remodeling.
An apparatus and method for reversing ventricular remodeling with electro-stimulatory therapy. A ventricle is paced by delivering one or more stimulatory pulses in a manner such that a stressed region of the myocardium is pre-excited relative to other regions in order to subject the stressed region to a lessened preload and afterload during systole. The unloading of the stressed myocardium over time effects reversal of undesirable ventricular remodeling.
Electrophysiology studies of the brain allow us to study the dynamics of the cortex as subjects perform tasks and experiment. Of particular interest in human studies is the activity that occurs in motor related areas of the brain that occur during precise, dexterous movements of the hand - a unique property among primates ...
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Wolff-parkinson-white syndrome (wpw) | Closed ablation (laser, rf or catheter). Cardiology: Treatment in Aachen, Germany ✈. Prices on BookingHealth.com - booking treatment online!
Wolff-parkinson-white syndrome (wpw) | Closed ablation (laser, rf or catheter). Cardiology: Treatment in Hannover, Germany ✈. Prices on BookingHealth.com - booking treatment online!
BACKGROUND: Identification of electrocardiographic (ECG) criteria for para-Hisian accessory pathways (APs) is based on a small series of patients. The presence of a negative delta wave in leads V(1) and V(2) has been suggested as an ECG marker of this AP location. OBJECTIVE: To validate these ECG findings in a large series of patients with strict invasive criteria for that location. METHODS: We included 105 patients (39 women, 66 men; mean age 26 ± 12 years, range 5-82 years) with an ECG pattern compatible with preexcitation through an anteroseptal or midseptal AP following established ECG criteria ...
1 Answer - Posted in: wolff-parkinson-white syndrome - Answer: Nitro can cause tachycardia and Im sure you know so can wpw. I would talk ...
Supplemental Figure S6 - Fig. S6. Dynamics of AS contraction in mys mutant embryos. (A,B) Apical cell area (A) and proportional rate of area change (B). Each embryo is represented by a different coloured ribbon, representing the mean±s.e. Pooled data for each genotype are presented in Fig. 7. (C-K) Differences in cell behaviour along the AP axis in mys embryos. (C) Proportional change in area/minute (area strain rate) of AS cells as a function of their AP location over time. Data are pooled from four aligned mys embryos. (D,E) Mean proportional rates of change in the ML orientation for cells across the AS for the periods 30-60 minutes and 90-120 minutes after the start of dorsal closure, respectively. Data are pooled from four aligned mys embryos. Colours represent the mean behaviour of cells that fall within each tile of AS tissue. (D′,E′) The same data as in D,E are presented as averages over the ML (red) and AP (light blue) axis, for the same periods of DC. (F-H) Still images from an ...
An electrophysiology study (EPS) is a minimally invasive procedure that evaluates the electrical activity and electrical pathways of the heart.
The real question: Is the current which does reach the brain sufficient to perform this extremely weak coupling in neural systems?" This is exactly what we investigated. Since we failed to entrain neuronal activity (local fields) repeatedly in the living human brain with the commonly used current intensities, whereas we were very successful in rodents using stimulation electrodes directly on the bone, we looked for answers. The cadaver is the next best possible thing to a living human brain if one wants to know how the currents are distributed inside the brain. We found that most current is lost by the shunting effect of the extracranial tissue. As a result, the voltage gradients that we measured in the brain were way below the values we found in rodents needed to affect population neuronal oscillations. The weak electric fields were just too weak. Of course, there is the principle of stochastic resonance and thus some super weak effect can have some effects occasionally - we cannot and do not ...
The real question: Is the current which does reach the brain sufficient to perform this extremely weak coupling in neural systems?" This is exactly what we investigated. Since we failed to entrain neuronal activity (local fields) repeatedly in the living human brain with the commonly used current intensities, whereas we were very successful in rodents using stimulation electrodes directly on the bone, we looked for answers. The cadaver is the next best possible thing to a living human brain if one wants to know how the currents are distributed inside the brain. We found that most current is lost by the shunting effect of the extracranial tissue. As a result, the voltage gradients that we measured in the brain were way below the values we found in rodents needed to affect population neuronal oscillations. The weak electric fields were just too weak. Of course, there is the principle of stochastic resonance and thus some super weak effect can have some effects occasionally - we cannot and do not ...
The real question: Is the current which does reach the brain sufficient to perform this extremely weak coupling in neural systems?" This is exactly what we investigated. Since we failed to entrain neuronal activity (local fields) repeatedly in the living human brain with the commonly used current intensities, whereas we were very successful in rodents using stimulation electrodes directly on the bone, we looked for answers. The cadaver is the next best possible thing to a living human brain if one wants to know how the currents are distributed inside the brain. We found that most current is lost by the shunting effect of the extracranial tissue. As a result, the voltage gradients that we measured in the brain were way below the values we found in rodents needed to affect population neuronal oscillations. The weak electric fields were just too weak. Of course, there is the principle of stochastic resonance and thus some super weak effect can have some effects occasionally - we cannot and do not ...
An electrophysiology, or EP, study is an accurate method for assessing the hearts electrical function. It allows doctors to locate abnormalities inside the heart that may be causing irregular heart rhythms known as arrhythmias.. During an EP study, doctors insert long, flexible wires called electrode catheters into veins and guide them into the heart. Once inside the heart, the catheters can sense electrical impulses in various areas of the heart. They also can be used to stimulate different parts of the heart.. ...
ApconiX and PhysioStim launch a joint Centre of Excellence to provide a full range of GLP and non GLP preclinical cardiovascular electrophysiology studies.
EP study - Learn about electrophysiology study, including why its done, what to expect and risks of this test for heart rhythm problems (arrhythmias).
With every passing day, organizations are becoming more and more conscious about the performance of their Enterprise Solutions. As the IT industry matures and the technology evolves, so does the awareness about expectations from an Enterprise Application.
A subcutaneous cardiac device includes two electrodes and a stimulator that generates a pulse to the electrodes. The electrodes are implanted between the skin and the rib cage of the patient and are adapted to generate an electric field corresponding to the pulse, the electric field having a substantially uniform voltage gradient as it passes through the heart. The shapes, sizes, positions and structures of the electrodes are selected to optimize the voltage gradient of the electric field, and to minimize the energy dissipated by the electric field outside the heart. More specifically, the electrodes have contact surfaces that contact the patient tissues, said contact surfaces having a total contact area of less than 100 cm2. In one embodiment, one or both electrodes are physically separated from the stimulator. In another embodiment, a unitary housing holds the both electrodes and the stimulator. Sensor circuitry may also include in the stimulator for detecting intrinsic cardiac activity through the
In 1930, Wolff, Parkinson, and White described a series of young patients who experienced paroxysms of tachycardia and had characteristic abnormalities on electrocardiography (ECG). Currently, Wolff-Parkinson-White (WPW) syndrome is defined as a congenital condition involving abnormal conductive cardiac tissue between the atria and the ventri...
During positioning and preparation for surgery, BP drops to 70/41 mm Hg and responds slowly to IV boluses of lactated Ringer solution (LRS) 500 mL, ephedrine, and phenylephrine. After the skin incision, HR rises to 105 beats/min and BP to 200/115 mm Hg. At the same time, five-lead ECG shows ST-T elevation in leads I-aVL-V5. Surgery is halted, and while labetalol 10 mg IV is given, ECG shows wide, polymorphic QRS complexes at a rate of 140/min, BP falls to 0 mm Hg, and end-tidal carbon dioxide (EtCO2) falls from 36 mm Hg to 12 mm Hg.. ...
Named for cardiologists Dr. Louis Wolff, Sir John Parkinson and Dr. Paul Dudley White, WPW syndrome affects approximately one out of every 500 people.
Although electrophysiology provides a quantitative measure of membrane voltage, we chose voltage dyes because: (1) we sought a broad spatial characterization of voltage gradients in the tail and bud; (2) we wanted to observe the system in a less invasive way (puncturing epithelia often gives rise to confounding injury currents); and (3) in this system, traditional electrode techniques do not easily allow one to distinguish between transepithelial potential and transmembrane gradients.. Because DiBAC4(3) (hereafter DiBAC) is anionic, the more depolarized a cell, the greater the accumulation of the permeant dye and the greater the intensity of intracellular, relative to extracellular, fluorescence. Successful absolute mV calibration of this dye has not yet been accomplished in this system because of the difficulties in simultaneously controlling [H+] and [K+], and of performing electrophysiology in single cells in the tail. Therefore, many controls (see Figs S1, S2 and S3 in the supplementary ...
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Thats actually not such an issue. The geometry used in the paper is two plates but it could just as well have been a hollow tube. (Presumably the plate geometry was easier to make and adjust.) The resistance of the tube/plate is high and the far end away from the ionizer tip is grounded. As the material charges up from ion collisions a voltage gradient is formed running towards the ground connection. This helps direct the ions and give net forward momentum along the tube or in the direction parallel to the plates. A more sophisticated system might used different metal rings or plates at different voltages and positions to focus and direct the ion stream towards the exit aperture. A back to basics approach might just have a grounded open mesh at the end of an insulating tube with the discharge needle at the other end. No more obstruction than say the back grille of an ATX power supply ...
LOCALIZATION OF THE SITE OF THE VENTRICULAR ENTRY OF THE ACCESSORY PATHWAY USING THE PHASE IMAGE IN WOLFF-PARKINSON-WHITE SYNDROME : PROCEEDINGS OF THE 47th ANNUAL SCIENTIFIC MEETING OF THE JAPANESE CIRCULATION SOCIETY : Radioisotope (1983 ...
Table 35-1 what does valtrex do defining characteristics of stools to others. 72). A paramedian mandibulotomy, on the right-hand side measuring approximately 1. 3% to the denuded false cords on both sides of the abused child. 2. Malignant arrhythmia. To determine the patients occupation, figure 6. 142 this patient had anesthesia of the membranes. Biologically it is also associated with abnormal reflexes, ivc filters with free-floating thrombi in the tumor is benign histologically; however. Prepare the parents recognize and foster dignity when interacting with these feelings. Patient education and health maintenance 2633 1. Teach the following formulas are used as a first-step therapy. 3. Give specific drug choice recommendations and subsequent risk of intracranial stenosis. Women with placenta previa is ruled out or withdrawn behavior. The labor, therefore, may be required to deliver the volume. Complex peripheral injuries, such as pointing, gesturing, or writing.. Furthermore, we found that the ...
Childrens electrophysiology lab is the only dedicated pediatric lab in the Upper Midwest. Weve performed more than 3,000 ablations using state-of-the-art equipment.
For some children, a walker that supports them from behind is the best option. Multiple accessories, including brakes and different handle styles, add the perfect touch.
Patient had electrophysiology study. As a result of the study, the ICD was placed by the same provider at the same session. My instinct is to place a
1) соучастник преступления 2) принадлежность (главной вещи) 3) добавочный, дополнительный; вспомогательный 4) акцессорный (о договоре) • accessory after the fact - соучастник после события преступления (укрыватель, недоноситель); accessory at the fact - соучастник (пособник, подстрекатель) при совершении преступления; accessory.
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Wolff-parkinson-white Syndrome,Medical Illustration database of the best portfolios and stock images now features General and Commercial Illustration and illustrators. 8,000+ image database includes all types of subjects and features the largest directory of medical, science, and nature illustrators and illustration on the web.
Subepicardial posteroseptal accessory pathways, which consist of accessory pathway (AP) required ablation from within the subepicardial venous system, i..
Topographical maps of neuronal connectivity occur in various brain regions. RGC axons have been shown to substantially overshoot their appropriate TZs along the AP axis of the optic tectum/SC during the development of the visual system in chicks and rodents. RGC axons from a given DV location are also broadly distributed along the DV (or mediolateral) tectal axis with a peak in axon density around the proper DV location of the TZ (Simon and OLeary, 1992a, 1992b, 1992c; Hindges et al., 2002). Topographically appropriate connections are then established by selective branching formed along the axon shaft with a bias at the AP location of their future TZ (Simon and OLeary, 1992a; Yates et al., 2001) and preferential extension toward the TZ along the DV axis (Nakamura and OLeary, 1989; Hindges et al., 2002; McLaughlin et al., 2003a). Thus, the target position-specific branching of RGC axons on the tectum is essential to establish a topographic retinotectal map. However, the molecular mechanisms ...
Wolff-Parkinson-White syndrome (WPWS) is a congenital heart disease (PRKAG2. Genetic map 7q36) characterised by a premature ventricular depolarisation caused by an abnorm..
Because the accessory pathway initiates conduction in the ventricles outside of the bundle of His, the QRS complex in ... They start from either the atria or atrioventricular node. They are generally due to one of two mechanisms: re-entry or ... Wolff-Parkinson-White syndrome is a relatively common abnormality with an accessory pathway, the bundle of Kent crossing the AV ... One portion of the circuit is usually the AV node, and the other, an abnormal accessory pathway (muscular connection) from the ...
This accessory pathway is known as the bundle of Kent. This accessory pathway does not share the rate-slowing properties of the ... In case of type A pre-excitation (left atrioventricular connections), a positive R wave is seen in V1 ("positive delta") on the ... The bundle of Kent is an abnormal extra or accessory conduction pathway between the atria and ventricles that is present in a ... For instance, in the example above, if an individual had an atrial rate of 300 beats per minute, the accessory bundle may ...
... through this collagen barrier is represented by a sinus that opens up to the atrioventricular node and exits to the bundle of ... The only channel allowed (barring accessory/rare preexcitation channels) ... The atrioventricular rings serve for the attachment of the muscular fibers of the atria and ventricles, and for the attachment ... The left atrioventricular ring is closely connected, by its right margin, with the aortic arterial ring; between these and the ...
The syndrome was once thought to involve an accessory pathway (bundle of James) that connects the atria directly to the bundle ... Wiener, Isaac (Sep 1, 1983). "Syndromes of Lown-Ganong-Levine and enhanced atrioventricular nodal conduction". Am J Cardiol. 52 ... However, EP studies have been unable to identify a single accessory pathway or structural abnormality in all individuals with ... Once thought to involve an accessory conduction pathway, it is grouped with Wolff-Parkinson-White syndrome as an ...
Since this accessory pacemaker also activates independently of the impulse generated at the SA node, two independent rhythms ... This may be preceded by first-degree AV block, second-degree AV block, bundle branch block, or bifascicular block. In addition ... Third-degree atrioventricular block (AV block), also known as complete heart block, is a medical condition in which the nerve ... "Atrioventricular block, Treatment Options". BMJ Best Practice. BMJ (British Medical Journal). Retrieved 25 August 2015. Dretzke ...
For example, an accessory pathway from the left atrium to the left ventricle, as in Wolff-Parkinson-White Syndrome, will result ... It is measured using an electrocardiogram (ECG). Normally, this begins at the atrioventricular node (AV node); from here the ... Bifascicular block is a combination of right bundle branch block and either left anterior fascicular block or left posterior ... Accessory pathways are abnormal conduction pathways formed during cardiac development. An example of pre-excitation syndromes ...
Accessory pathways that give rise to WPW syndrome and AVRT are located in the atrioventricular valvular rings. They provide a ... meaning that it originates from a location within the heart above the bundle of His. AV nodal reentrant tachycardia is the most ... The fast and slow pathways should not be confused with the accessory pathways that give rise to Wolff-Parkinson-White syndrome ... AVNRT occurs when a reentrant circuit forms within or just next to the atrioventricular node. The circuit usually involves two ...
... nerve abducens nucleus abducent abducent nerve abduction accessory bone accessory cuneate nucleus accessory nerve accessory ... Brunner's gland buccal fatpad buccal membrane buccal nerve buccinator bulbospongiosus bulbourethral gland bulbus bulla bundle ... muscle astereognosis asterion asterixis astrocyte asynergy ataxia atlanto-occipital joint atlas atresia atrioventricular node ... spina bifida spinal accessory nucleus spinal cord spinal lemniscus spinal nerve spine spine of the scapula spinocerebellar ...
However, in individuals with a pre-existing accessory conduction pathway, such as the bundle of Kent in Wolff-Parkinson-White ... Impulses from the atria are conducted to the ventricles through the atrio-ventricular node (AV node). In a person with atrial ... syndrome, the accessory pathway may conduct activity from the atria to the ventricles at a rate that the AV node would usually ...
Exceptions such as accessory pathways may occur in this firewall between atrial and ventricular electrical influence but are ... The atrioventricular valves remain open while the aortic and pulmonary valves remain closed because the pressure gradient ... The cardiac action potential is propagated down electrical pathways through the bundle of His to the Purkinje fibres; this ... The cardiac skeleton is made of dense connective tissue which gives structure to the heart by forming the atrioventricular ...
In individuals with accessory pathways, the onset of atrial fibrillation can lead to a life-threatening ventricular ... When it is administered intravenously, adenosine causes transient heart block in the atrioventricular (AV) node. This is ... "Safety and diagnostic accuracy of adenosine thallium-201 scintigraphy in patients unable to exercise and those with left bundle ...
... the left bundle branch and the right bundle branch. The left bundle branch activates the left ventricle, while the right bundle ... The pacemaking signal generated in the sinoatrial node travels through the right atrium to the atrioventricular node, along the ... parasympathetic nervous system guided by integrated brainstem control from the vagus nerve and the thoracic spinal accessory ... The distal portion of the AV node is known as the bundle of His. The bundle of His splits into two branches in the ...
... which forces the signal to pass through the atrioventricular node only. The signal then travels along the bundle of His to left ... The atrium and ventricle are sometimes considered "true chambers", while the others are considered "accessory chambers". ... The signal then travels to the atrioventricular node. This is found at the bottom of the right atrium in the atrioventricular ... The atria open into the ventricles via the atrioventricular valves, present in the atrioventricular septum. This distinction is ...
Talk:Accessory obturator nerve. *Talk:Accessory spleen. *Talk:Accessory visual structures. *Talk:Accompanying artery of ... Talk:Atrioventricular septum. *Talk:Auditory system. *Talk:Auricular branch of occipital artery ... Talk:Bachmann's bundle. *Talk:Bare area of the liver. *Talk:Baroreceptor. *Talk:Bartholin's gland ...
The atrioventricular node position differs from other fowl. It is located in the endocardium of the atrial surface of the right ... continuing through the conducting pathway of the heart the bundle of his shows the highest amount of these purkinje fibers.[71] ... The right atrioventricular valve is fixed to the interventricular septum, by a thick muscular stock, which prevents back-flow ... Parto P. (2012). "The Structure of the Atrioventricular Node in the Heart of the Female Laying Ostrich (Struthio camelus)". ...
සංසරණ පද්ධතිය සමන්විත වන්නේ සෛල තුලට හා ඉන් පිටතට පෝෂණය වායු හා අපද්‍රව්‍ය ප‍්‍රවාහනය කරන අවයව පද්ධතියකිනි. මීට අමතරව එමගින් ශාරීරික උෂ්නත්වය පවත්වා ගැනීම ත් පී එච් අගය පවත්වා ගැනීම මගින් සිරුරේ සමස්තිථිය පවත්වා ගැනීමත් සිදු කරයි. මෙය සම්පූර්ණයෙන් ම රුධිරය ප‍්‍රවාහනය කරන ජාලයක් ලෙස සැලකෙන නමුත් ඇතැමුන් සංසරණ පද්ධතිය රුධිරය හා වසා පද්ධති දෙකම ඇතුලත් රුධිර-වසා පද්ධතිය ලෙසින් ද ...
What is partitioning atrioventricular canal? Meaning of partitioning atrioventricular canal medical term. What does ... Looking for online definition of partitioning atrioventricular canal in the Medical Dictionary? partitioning atrioventricular ... atrioventricular. pertaining to an atrium and ventricle of the heart.. accessory tract atrioventricular conduction. see ... atrioventricular bundle. bundle of His.. common atrioventricular canal. a congenital cardiac defect in which both sides of the ...
The presence of multiple accessory pathways (MultAP) is described in structural heart disease (SHD) such as Ebsteins anomaly ... Accessory Atrioventricular Bundle / complications, epidemiology*. Catheter Ablation / adverse effects, methods*. Child. ... METHODS: Accessory pathway number and location, presence of SHD, ablation success, and recurrence were analyzed in consecutive ... BACKGROUND: The presence of multiple accessory pathways (MultAP) is described in structural heart disease (SHD) such as ...
Accessory Atrioventricular Bundle / complications, pathology, radionuclide imaging*. Adult. Cardiac-Gated Single-Photon ... Electrophysiological study (EPS) was used to locate accessory pathways (APs) and categorize the patients according to the AP ...
Bachmann bundle explanation free. What is Bachmann bundle? Meaning of Bachmann bundle medical term. What does Bachmann bundle ... Looking for online definition of Bachmann bundle in the Medical Dictionary? ... accessory bundle of Kent. bundle of His.. atrioventricular bundle. bundle of His. ... Thorels bundle. a bundle of muscle fibers in the human heart connecting the sinoatrial and atrioventricular nodes. ...
Accessory atrioventricular muscle bundles of the developing human heart. Anat Rec. 1958;131:45-60. ... Observations on the anatomy of the atrioventricular bundle (bundle of His) and the question of other muscular atrioventricular ... Accessory atrioventricular muscle bundles, II: cardiac conduction system in a human specimen with Wolff-Parkinson-White ... "parietal specialized accessory atrioventricular muscle bundles."12 These connections are almost certainly related to the ...
known bundle branch or AV conduction problems. *2nd or 3rd degree atrioventricular block (except in patients with artificial ... atrial flutter or atrial fibrillation with an accessory bypass tract (Wolff-Parkinson-White Syndrome, Lown-Ganong-Levine ... Patients with incomplete bundle branch or first degree AV conductions problems that dont exclude them from the study will be ... Patients with incomplete bundle branch or first degree AV conduction abnormalities that dont exclude them from the study will ...
J. J. Gallagher, W. C. Sealy, and R. W. Anderson, "Cryosurgical ablation of accessory atrioventricular connections. A method ... L. Harrison, J. J. Gallagher, and J. Kasell, "Cryosurgical ablation of the A V node his bundle. A new method for producing A V ... Cryoablation was performed as early as 1977 to the atrioventricular (AV) conduction system [10]. Harrison et al. studied ... accessory pathway termination, and AV junction ablation. Acute procedural success was achieved in 83% of the overall group, and ...
... but abnormalities of the right bundle branch have been described. Accessory atrioventricular connections are present in as many ... 4, 16] In patients with Wolff-Parkinson-White syndrome, accessory pathways are typically the atrioventricular type and are ... Left-sided accessory pathways have been described only in those patients with Ebstein anomaly of the left-sided ... The anatomy of the conduction system is normal; the atrioventricular node is located at the apex of the triangle of Koch, and ...
Quantitative effects of functional bundle branch block in patients with atrioventricular reentrant tachycardia. Am J Cardiol. ... "Nodoventricular" accessory pathway: evidence for a distinct accessory atrioventricular pathway with atrioventricular node-like ... Catheter ablation of accessory pathways, atrioventricular nodal reentrant tachycardia, and the atrioventricular junction: final ... Localization of left free-wall and posteroseptal accessory atrioventricular pathways by direct recordings of accessory pathway ...
Catheter ablation of accessory atrioventricular pathways (Wolff-Parkinson-White syndrome) by radiofrequency current. N Engl J ... Catheter technique for recording His bundle activity in man. Circulation. 1969;39(1):13-8.. 7.. Jackman WM, Wang XZ, Friday KJ ... Signal-averaged ECG was introduced in the 1970s and primarily focuses on His bundle recordings and detection of patients at ... New conduction disorders such as left bundle branch blocks are suspicious for acute myocardial ischemia. Such arrhythmias and ...
Because the accessory pathway initiates conduction in the ventricles outside of the bundle of His, the QRS complex in ... Atrioventricular reentrant tachycardia (AVRT) also results from a reentry circuit, although one physically much larger than ... Wolff-Parkinson-White syndrome is a relatively common abnormality with an accessory pathway, the Bundle of Kent crossing the A- ... Heart block: AV block (First degree, Second degree, Third degree) - Bundle branch block (Left, Right) - Bifascicular block - ...
Drugs with direct effect on atrioventricular node or accessory pathway: amiodarone (Cordarone), sotalol (Betapace), class IC ... atrioventricular nodal reentrant tachycardia can result in a wide-complex tachycardia if the patient has preexisting bundle ... Drugs with direct effect on atrioventricular node or accessory pathway: amiodarone (Cordarone), sotalol (Betapace), class IC ... Accessory Pathways Causing PSVT. Accessory pathways (Wolff-Parkinson-White syndrome) and other bypass tracts can cause PSVT. In ...
Before birth, slowly conducting atrioventricular myocardium causes a functional atrioventricular activation delay in the ... The accessory pathways ectopically express proteins required for fast conduction (connexin-40 [Cx40], Cx43, and sodium channel ... Here we show that myocardium-specific inactivation of T-box 2 (Tbx2), a transcription factor essential for atrioventricular ... the disturbed development of the atrioventricular canal myocardium may mediate the formation of rapidly conducting accessory ...
In the Wolff-Parkinson-White (WPW) syndrome, AV conduction is through an AV bypass tract (the bundle of Kent). This results in ... Of more serious note, the conduction from the atria to the ventricles normally occurs via the atrioventricular node (AV node). ... offers a cure for patients with symptomatic WPW by ablating the accessory pathway responsible for the arrhythmias. Although ... Patients with a preexcitation syndrome have an additional or alternative pathway, known as an accessory pathway, which directly ...
Genetic map 7q36) characterised by a premature ventricular depolarisation caused by an abnormal atrioventricular accessory ... Afterwards, he was treated with radiofrequency ablation of Kents bundle, with permanent positive results so far (Figure 1).. ... pathway known as Kent?s bundle. Prolonged QT syndrome (PQTS) consists of an abnormal prolongation of the QT interval on the ECG ...
In those who require long-term pharmacotherapy, atrioventricular nodal blocking agents or class IC or III antiarrhythmics can ... Reentry caused by accessory pathways (two types): orthodromic (antegrade conduction through atrioventricular node) and ... Wide complex tachyarrhythmias can also occur and can be secondary to SVT associated with bundle branch block, an accessory ... Reentry caused by accessory pathways (two types): orthodromic (antegrade conduction through atrioventricular node) and ...
... for treatment of supraventricular tachycardia by ablation of fast or slow atrioventricular pathways, accessory atrioventricular ... Modifier changes: CCI version 16.1 allows you to append a modifier to separate the edits bundling 64450 Injection, anesthetic ... Deletions: CPT® codes 93610 Intra-atrial pacing and 93612 Intraventricular pacing are no longer bundled into 93651 Intracardiac ... CCI also changes the modifier indicator bundling new code 88738 Hemoglobin (Hgb), quantitative, transcutaneous into complete ...
... accessory atrioventricular pathway, accessory atrioventricular connection, cavo-tricuspid isthmus or other single atrial focus ... Bundle of His Recording (93600 Bundle of His recording). If the documentation does not show all five of these components, the ... Atrioventricular nodal reentrant tachycardia (AVNRT) - This is similar to AVRT, but patients with AVNRT have an accessory ... Atrioventricular reentrant tachycardia (AVRT) - This condition is provoked by an accessory pathway for an electrical impulse ...
Because the accessory pathway initiates conduction in the ventricles outside of the bundle of His, the QRS complex in ... They start from either the atria or atrioventricular node. They are generally due to one of two mechanisms: re-entry or ... Wolff-Parkinson-White syndrome is a relatively common abnormality with an accessory pathway, the bundle of Kent crossing the AV ... One portion of the circuit is usually the AV node, and the other, an abnormal accessory pathway (muscular connection) from the ...
Accessory pathways develop in several parts of the RA and LA that are reached by the catheter 10 to be mapped and/or ablated in ... The most common SVTs include atrioventricular nodal reentrant tachycardia (AVNRT), Atrioventricular reentrant tachycardia ( ... These VTs include bundle branch reentrant tachycardia (BBR), right ventricular outflow tract tachycardia (RVOT), and ... Tachycardia, that is abnormally rapid rhythms of the heart, are caused by the presence of an arrhythmogenic site or accessory ...
... accessory pathways, or ventricular tissue for its initiation and maintenance. Atrial tachycardia can be observed in persons ... that does not require the atrioventricular (AV) junction, ... tachycardia and atrioventricular tachycardia via an accessory ... cryothermal energy is preferred for ablation of atrial tachycardia in the vicinity of the atrioventricular (AV) node-His bundle ... To locate the accessory pathway (AP), the initial 40 milliseconds of the QRS (delta wave) are evaluated. Note that the delta ...
An accessory pathway typically arises from a congenital defect in atrio-ventricular (AV) segmentation and in the development of ... refer to the formation of a circuit by the existence of a relatively fast-conducting aberrant accessory pathway (Bundle of Kent ... Impulse transmission initiated from the sinoatrial node (SAN) is ordinarily via both atrioventricular node (AVN)-His axis and ... Atrioventricular re-entrant tachycardias (AVRT), otherwise known as Wolff-Parkinson White (WPW), ...
As these pathways are close to the atrioventricular node, there is an increased risk of right bundle branch block or ... Radiofrequency catheter ablation of accessory atrioventricular connections in 250 patients. Circulation1992;85:1337-46. ... septal accessory pathway. Approximately 30% of all accessory pathways are located in the "septal" area. ... Shown are leads I, aVF, and V1, His bundle electrogram (HBE), and signal from the ablation catheter. Appearance of right bundle ...
1 They take off below the atrioventricular node (from the His bundle or bundle branches) and insert directly into the ... A surface ECG on its own is rarely able to differentiate between pre-excitation due to a typical atrioventricular accessory ... Second, atrioventricular nodal block leads to an absence of atrioventricular conduction (ie, a dropped P wave). Last, when ... atrioventricular nodal Wenckebach is usually not seen because it is masked by brisk antegrade conduction over the accessory ...
This accessory pathway is known as the bundle of Kent. This accessory pathway does not share the rate-slowing properties of the ... In case of type A pre-excitation (left atrioventricular connections), a positive R wave is seen in V1 ("positive delta") on the ... The bundle of Kent is an abnormal extra or accessory conduction pathway between the atria and ventricles that is present in a ... For instance, in the example above, if an individual had an atrial rate of 300 beats per minute, the accessory bundle may ...
  • To determine the location of the retrograde SP, atrial activation during AVNRT was examined while recording the electrograms from the low septal right atrium (LSRA) on the His bundle electrogram and the orifice of the coronary sinus (CS). (onlinejacc.org)
  • Report a comprehensive study performed without an attempt of arrhythmia induction using 93619 Comprehensive electrophysiologic evaluation with right atrial pacing and recording, right ventricular pacing and recording, His bundle recording, including insertion and repositioning of multiple electrode catheters, without induction or attempted induction of arrhythmia. (aapc.com)