Extra impulse-conducting tissue in the heart that creates abnormal impulse-conducting connections between HEART ATRIA and HEART VENTRICLES.
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.
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 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.
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.
The hollow, muscular organ that maintains the circulation of the blood.
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.
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.
The valve consisting of three cusps situated between the right atrium and right ventricle of the heart.
The chambers of the heart, to which the BLOOD returns from the circulation.
A calcium channel blocker that is a class IV anti-arrhythmia agent.
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)
Benign and malignant neoplastic processes that arise from or secondarily involve the meningeal coverings of the brain and spinal cord.
A benzothiazepine derivative with vasodilating action due to its antagonism of the actions of CALCIUM ion on membrane functions.
Experimentally induced neoplasms of CONNECTIVE TISSUE in animals to provide a model for studying human SARCOMA.
An antineoplastic agent that inhibits DNA synthesis through the inhibition of ribonucleoside diphosphate reductase.
A class of drugs that act by selective inhibition of calcium influx through cellular membranes.
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 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.
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.
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.
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.
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.
The number of times the HEART VENTRICLES contract per unit of time, usually per minute.
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.
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)
NECROSIS of the MYOCARDIUM caused by an obstruction of the blood supply to the heart (CORONARY CIRCULATION).
A form of ventricular pre-excitation characterized by a short PR interval and a normal QRS complex. In this syndrome, the atrial impulse conducts via the JAMES FIBERS which connect the atrium to BUNDLE OF HIS bypassing the upper ATRIOVENTRICULAR NODE. HEART VENTRICLES are depolarized normally through the His-Purkinje system.
Works containing information articles on subjects in every field of knowledge, usually arranged in alphabetical order, or a similar work limited to a special field or subject. (From The ALA Glossary of Library and Information Science, 1983)
Abnormally rapid heartbeats with sudden onset and cessation.
Abnormally rapid heartbeats originating from one or more automatic foci (nonsinus pacemakers) in the HEART ATRIUM but away from the SINOATRIAL NODE. Unlike the reentry mechanism, automatic tachycardia speeds up and slows down gradually. The episode is characterized by a HEART RATE between 135 to less than 200 beats per minute and lasting 30 seconds or longer.
A generic expression for any tachycardia that originates above the BUNDLE OF HIS.
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.
Removal of tissue with electrical current delivered via electrodes positioned at the distal end of a catheter. Energy sources are commonly direct current (DC-shock) or alternating current at radiofrequencies (usually 750 kHz). The technique is used most often to ablate the AV junction and/or accessory pathways in order to interrupt AV conduction and produce AV block in the treatment of various tachyarrhythmias.
An 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).
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 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 designed to be left within an organ or passage for an extended period of time.
A flexible, tubular device that is used to carry fluids into or from a blood vessel, hollow organ, or body cavity.
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.
Act of listening for sounds within the heart.
Placement of an intravenous CATHETER in the subclavian, jugular, or other central vein.

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. ...
An electrophysiology study measures the electrical activity of your child's heart. Learn what to expect before, during and after this diagnostic test.
Learn more about Electrophysiology Study at Westside Regional Medical Center DefinitionReasons for ProcedurePossible ComplicationsWhat to ExpectCall Your Doctorrevision ...
List of 3 doctors offering Intracardiac Electrophysiology Study (EPS) in Manchester. Check out patient reviews, addresses and book a visit!
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
Electrophysiology Study (EPS) clinics in Domis de Semerpontlaan at the best price. Find doctors, specialized in Cardiology and compare prices, costs and reviews.
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.
Check the best low-cost and high-quality EPS Electrophysiology studies in Turkey and contact these Cardiology specialist hospitals.
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 ...
Wolff-Parkinson-White Syndrome in New Delhi Gurgaon Noida Faridabad NCR or Online Treatment of Wolff-Parkinson-White Syndrome Contact Us
Wolff-parkinson-white syndrome (wpw) | Closed ablation (laser, rf or catheter). Cardiology: Treatment in Hannover, Germany ✈. Prices on BookingHealth.com - booking treatment online!
Wolff-parkinson-white syndrome (wpw) | Closed ablation (laser, rf or catheter). Cardiology: Treatment in Aachen, 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.
DefinitionIntracardiac electrophysiology study (EPS) is a test to look at how well the hearts electrical signals are working. It is used to check for abnormal heartbeats or heart rhythms.
Electrophysiology Study (EPS) clinics in South Korea at the best price. Find doctors, specialized in Cardiology and compare prices, costs and reviews.
Voltages across various glabrous (and gland-free) regions of cavy skin range from 30 to 100 mV, inside positive; across hairy ones, 0 to 10 mV. (moreover, hairy areas also tend to maintain lower transcutaneous voltages in man.) When an incision is made through the glabrous epidermis of the cavy, a microampere flows through each millimeter of the cuts edge. These wound currents generate lateral, intraepidermal voltage gradients or fields of about 100-200 mV/mm near the cut; fields which decline with distance from the cut with a space constant of 0.3-0.4 mm. It is deduced from these data that the epidermis near a cut drives up to 300 microA/cm2 across itself; moreover, these currents and potentials can be grossly, rapidly, and (to some extent) reversibly reduced by amiloride. It is concluded that the hair and gland-free skin of cavies has a battery comparable in power and character to that of frogs; but it is suggested that this mammalian battery may primarily subserve epidermal wound healing ...
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).
Air conditioners are an outright need with regards to checking the air temperature. The air conditioner units help by diminishing the temperature with the goal that the room is substantially more agreeable. Be that as it may some of the time the air molding does not perform so well and needs support. There are proficient administrations accessible for cleaning an air conditioner yet it is commonly too exorbitant to even think about getting it done expertly. The less expensive path is to do it without anyone elses help however you would require bit by bit direction to clean the air conditioner so you do not demolish the unit. Cleaning an air conditioner unit is extremely simple when contrasted with the general conviction that it is a confounded and a monotonous errand. Cleaning your home unit just because may appear to be befuddling yet after that it is only easy. Coming up next is a bit by bit manual to clean your air conditioner as though you comprehended what you were doing.. You should get a ...
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.
Learn how new features in Clampex 11 software enhances functionality in Protocol Editor, increasing the users ability to create complex experimental protocols involving many command stimulations.
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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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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 (WPW) is a relatively common abnormality with an accessory pathway, the bundle of Kent crossing ... One portion of the circuit is usually the AV node, and the other, an abnormal accessory pathway (muscular connection) from the ...
... bundle of James) that connects the atria directly to the bundle of His, bypassing the slowly conducting atrioventricular node. ... LGL syndrome was originally thought to involve a rapidly conducting accessory pathway ( ... Whilst in a minority of cases some form of intranodal or paranodal fibers that bypass all or part of the atrioventricular node ... Wiener, Isaac (Sep 1, 1983). "Syndromes of Lown-Ganong-Levine and enhanced atrioventricular nodal conduction". Am J Cardiol. 52 ...
This accessory pathway is known as the bundle of Kent. This accessory pathway does not share the rate-slowing properties of the ... From there, the electrical stimulus is transmitted via internodal pathways to the atrioventricular (AV) node. After a brief ... 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 most common sites for accessory pathways are connections between muscle tissue in the atria and the ventricles (atrio- ... with their ventricular connection lying within or close to the right bundle branch. The fibres often conduct slowly and in one ... Unlike most atrio-ventricular accessory pathways which conduct electrical impulses at a relatively fixed speed, conduction ... An accessory pathway is an additional electrical connection between two parts of the heart. These pathways can lead to abnormal ...
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) is a medical condition in which the nerve impulse generated in the sinoatrial ... Early treatment of atrioventricular blockade is based on the presence and severity of symptoms and signs associated with ...
... so the electrical stimulus passes to the ventricle by this tract faster than via normal atrioventricular/bundle of His system, ... Pre-excitation is caused by an abnormal electrical connection or accessory pathway between or within the cardiac chambers. Pre- ... Physiologically, the normal electrical depolarization wave is delayed at the atrioventricular node to allow the atria to ... "atrioventricular node". In all pre-excitation syndromes, at least one more conductive pathway is present. ...
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 ...
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 ...
... 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 ...
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 ...
... the left bundle branch and the right bundle branch. The left bundle branch activates the left ventricle, while the right bundle ... Then the signals travel to the atrioventricular node (AV node), which is located in the interatrial septum. After a delay, 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.[74] ... 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 ...
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)". ...
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. ...
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 ...
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 ...
... 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 ...
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 ...
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 ...
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 - ...
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 ...
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 ...
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 ...
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 ...
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 ...
... 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 ...
... 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 ...
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 ...
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 ...
Dual atrioventricular (AV) node pathway physiology is known to occur in 8% to 40%1 2 3 4 of patients with accessory AV pathways ... A indicates atrial electrogram; CS4 to CS1, coronary sinus from proximal to distal, respectively; H, His bundle potential; HB, ... Termination of atrioventricular reentrant tachycardia with an atrioventricular node echo cycle. Atrioventricular tachycardia at ... Atrioventricular nodal reentry and dual atrioventricular node physiology in patients undergoing accessory pathway ablation. Am ...
Paroxysmal supraventricular tachycardias with narrow QRS are defined as rhythms originating from above the His bundle, heart ... 2005) Differentiating atrioventricular nodal reentrant tachycardia from tachycardia via concealed accessory pathway. Am J ... α: Alpha pathway; β: Beta pathway; AVN: Atrioventricular Node; His: His bundle; ECG: Electrocardiogram; PR: PR Interval; SVT: ... 1994) New algorithm for the localization of accessory atrioventricular connections using a baseline electrocardiogram. J Am ...
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), ...
Accessory Atrioventricular Bundle Limb-Girdle Muscular Dystrophies Heart Block Syncope Muscular Diseases ...
... bundle of James) that connects the atria directly to the bundle of His, bypassing the slowly conducting atrioventricular node. ... LGL syndrome was originally thought to involve a rapidly conducting accessory pathway ( ... Whilst in a minority of cases some form of intranodal or paranodal fibers that bypass all or part of the atrioventricular node ... Wiener, Isaac (Sep 1, 1983). "Syndromes of Lown-Ganong-Levine and enhanced atrioventricular nodal conduction". Am J Cardiol. 52 ...
The most common sites for accessory pathways are connections between muscle tissue in the atria and the ventricles (atrio- ... with their ventricular connection lying within or close to the right bundle branch. The fibres often conduct slowly and in one ... Unlike most atrio-ventricular accessory pathways which conduct electrical impulses at a relatively fixed speed, conduction ... An accessory pathway is an additional electrical connection between two parts of the heart. These pathways can lead to abnormal ...
A) A physiological mechanism of conduction in WPW with accessory pathway conduction (atrioventricular) resulting in the delta ... and White first described the condition in 1930 in a series of 11 healthy young adults with a functional bundle branch block, ... C) Antidromic conduction where accessory pathway conducts anterogradely (atrioventricular) and the impulse returns to the atria ... Antidromic tachycardias occur when the accessory pathway conducts anterogradely (atrioventricular) and the impulse returns to ...
Accessory Atrioventricular Bundle * Atrioventricular Nodal Reentry Tachycardia * Atrioventricular Node * Ventricular ... J. (1981). Atrioventricular Dissociation During Paroxysmal Junctional Tachycardia. Pacing and Clinical Electrophysiology, 4(6 ... Atrioventricular Dissociation During Paroxysmal Junctional Tachycardia. Pacing and Clinical Electrophysiology. 1981 Nov;4(6): ... Atrioventricular Dissociation During Paroxysmal Junctional Tachycardia. PATRICK T. KO, GERALD V. NACCARELLI, SAJAD GULAMHUSEIN ...
  • This condition increases the risk of atrioventricular tachycardia and, in the presence of atrial fibrillation, sudden death. (semanticscholar.org)
  • The primary treatment during an episode of atrial tachycardia is considered to be rate control using atrioventricular (AV) nodal blocking agents (eg, beta-blockers or calcium channel blockers). (medscape.com)
  • Supraventricular tachycardia (SVT) is tachycardia having an electropathologic substrate arising above the bundle of His and causing heart rates exceeding 100 beats per minute. (aafp.org)
  • This article focuses on the most common types of paroxysmal SVT: atrioventricular nodal reentrant tachycardia (AVNRT), atrioventricular reciprocating tachycardia (AVRT), and atrial tachycardia (AT). (aafp.org)
  • The only morbidity associated with the syndrome is the occurrence of paroxysmal episodes of tachycardia which may be of several types, including sinus tachycardia, atrioventricular nodal re-entrant tachycardia, atrial fibrillation, or atrial flutter. (wikipedia.org)
  • If conduction to the ventricles occurs solely through the pathway (maximal pre-excitation), as occurs during arrhythmias like antidromic atrioventricular re-entrant tachycardia, the ECG appearance is of QRS complexes with a left bundle branch block morphology which can be mistaken for ventricular tachycardia. (wikipedia.org)
  • The main presentations of these regular tachycardias are atrioventricular nodal re-entrant tachycardia and orthodromic atrioventricular reentrant tachycardia due to an accessory pathway. (omicsonline.org)
  • The narrow QRS tachycardia is that which originates above the His bundle bifurcation, with QRS complexes of less than 120 ms and heart rate of more than 100 beats per minute (bpm). (omicsonline.org)
  • Among the regular narrow QRS tachycardia, the most common is typical atrioventricular (AV) nodal reentrant tachycardia, followed by orthodromic AV tachycardia. (omicsonline.org)
  • Of the 34 patients with inducible atrioventricular reentry, 17 used the slow and 11 used the fast anterograde AV node pathway exclusively during AV reentrant tachycardia, whereas 6 patients used both the fast and the slow AV node pathways. (ahajournals.org)
  • Two patients had only AV node reentrant tachycardia inducible despite the presence of the accessory pathway. (ahajournals.org)
  • We reviewed the records of 382 consecutive patients with accessory AV pathways who were referred for electrophysiological testing between January 1, 1990, and August 31, 1993, because of documented paroxysmal supraventricular tachycardia or palpitations. (ahajournals.org)
  • The baseline electrophysiology study data in all patients confirmed two important baseline characteristics: patients with inducible atrioventricular reentrant tachycardia that degenerates into AF and those with short antegrade refractoriness of the accessory pathway were more likely to experience VF. (acc.org)
  • The mechanism of tachycardia was atrioventricular nodal reentry in two patients. (elsevier.com)
  • Arrhythmic chronic treatment, designed to prevent crisis of ventricular tachycardia and to control ventricular rate in case of atrial fibrillation is realized by the administration of class IC antyarrhythmics (flecainide, propafenone), class III antiarrhythmics (amiodarone, sotalol), drugs that are increasing the refracted period in Kent bundle. (doctortipster.com)
  • Historically Wolff, Parkinson, and White first described the condition in 1930 in a series of 11 healthy young adults with a functional bundle branch block, an abnormally short PR interval and paroxysms of tachycardia or atrial fibrillation. (bmj.com)
  • Most case of paroxysmal supraventricular tachycardia (70-90%) are caused by reentry mechanisms, the substrate of these mechanisms is the existence of functional differences in the driving of cardiac structures or the presence of an accessory bundle. (doctortipster.com)
  • Paroxysmal supraventricular tachycardia with atrioventricular node reentry , making a circular motion. (doctortipster.com)
  • The authors report the unique case of remote onset of exercise induced focal ventricular tachycardia in a 40-year old male patient that originated from the ventricular end of an accessory atrioventricular pathway 18 months after a successful ablation. (elsevier.com)
  • I. Atrioventricular Nodal Reentrant Tachycardia: What every physician needs to know. (cancertherapyadvisor.com)
  • Atrioventricular nodal reentrant tachycardia (AVNRT) is the most common form of paroxysmal supraventricular tachycardia (PSVT) encountered in clinical practice. (cancertherapyadvisor.com)
  • Supraventricular tachycardia (SVT) generally refers to atrioventricular nodal re-entry tachycardia (AVNRT), atrioventricular re-entry tachycardia (AVRT) and atrial tachycardia [ 1 ] . (patient.info)
  • Entrainment for distinguishing atypical atrioventricular node reentrant tachycardia from atrioventricular reentrant tachycardia over septal accesso. (nih.gov)
  • Entrainment for distinguishing atypical atrioventricular node reentrant tachycardia from atrioventricular reentrant tachycardia over septal accessory pathways with long-RP [corrected] tachycardia. (nih.gov)
  • The response to right ventricular (RV) entrainment is useful to distinguish atypical AV node reentrant tachycardia from AV reentrant tachycardia using a septal accessory pathway. (nih.gov)
  • conduction of a supraventricular impulse from atrium to ventricle over an accessory pathway (bypass tract) - so called "pre-excited" tachycardia. (renalandurologynews.com)
  • The clinical situation that is commonly encountered is when the clinician is faced with an electrocardiogram (ECG) that shows a wide QRS complex tachycardia (WCT, QRS duration ≥120 ms, rate ≥100 bpm), and must decide whether the rhythm is of supraventricular origin with aberrant conduction (i.e., with bundle branch block), or whether it is of ventricular origin (i.e. (renalandurologynews.com)
  • WPW is a type of atrioventricular reentrant tachycardia . (thefullwiki.org)
  • The hypothesis that production of ischemia or cooling of an arrhythmogenic area or pathway could interrupt tachycardias was tested by subselective catheterization of the coronary artery supplying the site of origin of ventricular tachycardia (9 patients), the accessory pathway (2 patients) and the site of origin of atrial tachycardia (1 patient). (meta.org)
  • Selective cooling through the atrioventricular nodal artery in 1 patient terminated his circus movement tachycardia. (meta.org)
  • Supraventri-cular tachycardia comprises a wide range of arrhythmias that have their origin above the bifurcation of the bundle of His, encompassing sinus tachycardia, atrial flutter, atrial fibrillation, atrial tachycardia, atrioventricular junctional re-entrant tachycardia, including atrio-ventricular nodal re-entrant tachycardia, atrioventricular re-entrant tachycardia and junctional ectopic tachycardia. (scielo.org.za)
  • They may originate from one of three places: outside the intrinsic conduction pathway (ventricular tachycardia), as a supraventricular tachycardia with a bundle branch block or aberrancy, or as a supraventricular tachycardia with AV conduction over an accessory pathway. (renalandurologynews.com)
  • Diagnostic Confirmation: Are you sure your patient has Atrioventricular Nodal Reentrant Tachycardia? (psychiatryadvisor.com)
  • Occasionally the ECG may show bundle branch block aberration (either right or left bundle) and appear as a wide complex tachycardia. (psychiatryadvisor.com)
  • identified genetic culprits SCN5A and LMNA as a cause of idiopathic bundle branch reentry ventricular tachycardia. (statpearls.com)
  • As a pathophysiologic mechanism of arrhythmias, the incidence and prevalence depend on the arrhythmia ranging from highly prevalent diseases like atrial fibrillation to rare diseases like Wolff-Parkinson-White atrioventricular reentry tachycardia. (statpearls.com)
  • The accessory pathway predisposes the patient to episodes of fast heart rate ( supraventricular tachycardia ) due to the rapid self-sustaining circulation of an electrical impulse from the atria to the ventricles and back again (a re-entry circuit). (enacademic.com)
  • With an atrioventricular reentrant tachycardia, or AVRT, the electrical signal actually uses a separate accessory pathway to get back up from the ventricles to the atria, which causes the atria to contract before the SA node sends out another signal. (osmosis.org)
  • Another type of reentrant circuit is atrioventricular nodal reentrant tachycardia, or AVNRT. (osmosis.org)
  • To delineate the activation pattern and spatial distribution of the retrograde fast pathway within the triangle of Koch during typical atrioventricular nodal reentrant tachycardia (AVNRT) and right ventricular pacing in a consecutive series of patients using the Rhythmia mapping system (Boston Scientific, Natick, MA). (readbyqxmd.com)
  • Preexcitation alternans and orthodromic atrioventricular reciprocating tachycardia were diagnosed in a 3-month-old Boxer. (usda.gov)
  • Accessory pathways can participate in a macroreentrant circuit resulting in orthodromic atrioventricular reciprocating tachycardia (OAVRT). (usda.gov)
  • AV-nodal reciprocating tachycardia (AVNRT): the short circuit is the slow pathway, a bundle of cells located in the AV node. (rythmopole.paris)
  • Atrioventricular reciprocating tachycardia: the short circuit is the accessory pathway, often called the bundle of Kent, which is a supernumerary connection. (rythmopole.paris)
  • Patients who have an accessory pathway (AP) of atrioventricular (AV) conduction may develop circus movement tachycardia otherwise known as atrioventricular re-entrant tachycardia (AVRT). (ac.ke)
  • Wolff-Parkinson-White Syndrome (WPW) is when ventricular pre-excitation occurs as impulses originating in the sinoatrial node or atrium activate a portion of the ventricles prematurely through an accessory pathway without going through the AV node, causing, among other things, an abnormally fast heart beat rhythm ( supraventricular tachycardia ). (petmd.com)
  • Commonly associated arrhythmias include atrial fibrillation and atrioventricular reentrant tachycardia . (cardionetics.com)
  • SVT (e.g. sinus tachycardia, atrial tachycardia, atrial fibrillation, atrial flutter, etc.) conducted through a dysfunctional or damaged His-Purkinje System (e.g. right bundle branch block - RBBB) b. (teachim.org)
  • Antidromic atrioventricular re-entry tachycardia (AVRT), e.g. (teachim.org)
  • Individuals with accessory pathways are at risk of developing atrioventricular reentrant tachycardia (AVRT). (ecgwaves.com)
  • Wolff-Parkinson-White Syndrome (WPW) is a term referring to Louis Wolff who published an article in 1930 that describes 11 patients suffering from episodes of tachycardia with characteristic ECG findings (ECG pattern shows bundle branch block and shortened P-R interval). (lecturio.com)
  • METHODS: Accessory pathway number and location, presence of SHD, ablation success, and recurrence were analyzed in consecutive patients from our center over a 16-year period. (biomedsearch.com)
  • Fluoroscopy has been used to guide catheters into the heart chambers, but even in EP labs using fluoroscopy, 3D mapping systems are utilized more and more for accessory pathway (AP) ablation to tag AP location, a feature not possible to achieve using X-ray-only approach. (springer.com)
  • Klein G, Hackel D, Gallagher J. Anatomic substrate of impaired conduction over an accessory atrioventricular pathway in the Wolff-Parkinson-White syndrome. (springer.com)
  • Clinical characteristics and electrophysiologic properties of atrioventricular accessory pathways: importance of the accessory pathway location. (springer.com)
  • Localization of left free-wall and posteroseptal accessory atrioventricular pathways by direct recordings of accessory pathway activation. (springer.com)
  • Left free-wall accessory pathway ablation from the coronary sinus: unique coronary sinus electrogram pattern. (springer.com)
  • Genetic map 7q36) characterised by a premature ventricular depolarisation caused by an abnormal atrioventricular accessory pathway known as Kent?s bundle. (omicsonline.org)
  • Patients with a preexcitation syndrome have an additional or alternative pathway, known as an accessory pathway, which directly connects the atria and ventricles and bypasses the AV node. (wines.com)
  • If this is the case, ablative therapy, either surgical or with a catheter using radiofrequency energy, offers a cure for patients with symptomatic WPW by ablating the accessory pathway responsible for the arrhythmias. (wines.com)
  • Defective Tbx2-dependent patterning of the atrioventricular canal myocardium causes accessory pathway formation in mice. (semanticscholar.org)
  • The developmental mechanisms underlying accessory pathway formation are poorly understood but are thought to primarily involve malformation of the annulus fibrosus. (semanticscholar.org)
  • A standard electrophysiological study was performed and, after confirmation of the presence of an accessory pathway, transvenous RF or cryoablation was carried out. (bmj.com)
  • Right posteroseptal accessory pathway. (bmj.com)
  • This ECG is therefore consistent with the diagnosis of a fasciculoventricular accessory pathway (FVAP). (ahajournals.org)
  • These findings confirm the presence of a fasciculoventricular accessory pathway. (ahajournals.org)
  • A surface ECG on its own is rarely able to differentiate between pre-excitation due to a typical atrioventricular accessory pathway and that from an FVAP, especially in patients with anteroseptal or midseptal bypass tracts. (ahajournals.org)
  • 2 In a typical accessory pathway, atrioventricular nodal Wenckebach is usually not seen because it is masked by brisk antegrade conduction over the accessory pathway, resulting in a fixed P wave-to-delta wave time. (ahajournals.org)
  • LGL syndrome was originally thought to involve a rapidly conducting accessory pathway (bundle of James) that connects the atria directly to the bundle of His, bypassing the slowly conducting atrioventricular node. (wikipedia.org)
  • However, the majority of those with LGL in whom electrophysiological studies have been performed do not have any evidence of an accessory pathway or structural abnormality. (wikipedia.org)
  • An accessory pathway is an additional electrical connection between two parts of the heart. (wikipedia.org)
  • The combination of an accessory pathway that causes pre-excitation with arrhythmias is known as Wolff-Parkinson-White syndrome. (wikipedia.org)
  • Accessory pathways are often diagnosed using an electrocardiogram, but characterisation and location of the pathway may require an electrophysiological study. (wikipedia.org)
  • Unlike most atrio-ventricular accessory pathways which conduct electrical impulses at a relatively fixed speed, conduction through a Mahaim pathway varies according to how rapidly it is stimulated. (wikipedia.org)
  • Impulse transmission initiated from the sinoatrial node (SAN) is ordinarily via both atrioventricular node (AVN)-His axis and accessory pathway simultaneously, albeit with differing velocities and with variable preference. (bcs.com)
  • Background Dual atrioventricular (AV) node pathway physiology is frequently observed in patients with AV accessory pathways. (ahajournals.org)
  • Four patients with technically difficult accessory pathways were managed by AV node modification with slow pathway (3) or fast pathway (1) ablation. (ahajournals.org)
  • This may provide additional options for ablation in technically difficult cases when the accessory pathway is not otherwise problematic. (ahajournals.org)
  • Dual atrioventricular (AV) node pathway physiology is known to occur in 8% to 40% 1 2 3 4 of patients with accessory AV pathways, leading to a variety of possible reentrant circuits. (ahajournals.org)
  • When antegrade conduction over the accessory pathway masked antegrade conduction over the fast AV node pathway, the diagnosis of dual AV node pathways was based on the test performed after successful accessory pathway ablation. (ahajournals.org)
  • Regarding malignant ventricular arrhythmia risk, short antegrade refractoriness of the accessory pathway conveys the highest risk. (acc.org)
  • All patients underwent invasive electrophysiology testing to examine the conduction properties of the accessory pathway(s). (acc.org)
  • This study confirms our current approach that symptomatic and asymptomatic high-risk patients, easily stratified by the electrophysiology properties of the accessory pathway, benefit from ablation. (acc.org)
  • It is characterised by the presence of an accessory pathway between the atria and the ventricles which provides an alternative route for ventricular activation. (bmj.com)
  • He was found to have an accessory pathway with both antegrade and retrograde properties and underwent successful radiofrequency ablation. (bmj.com)
  • The accessory pathway was identified and found to be capable of fast antegrade conduction. (bmj.com)
  • In pre-excitation syndromes the accessory pathway permits the impulse to bypass the AVN (thus avoiding the associated delay) and permitting early depolarisation of the ventricular myocardium (fig 4A). (bmj.com)
  • Thus far, in all reported cases of accessory pathway related automaticity there was intact conduction over the pathway or acute injury to it. (elsevier.com)
  • Previous MI, re entry from an accessory pathway e.g. (brainscape.com)
  • These findings suggest the existence of an accessory pathway (Mahaim fibres) passing from the area of block, presumably the uppermost portion of the His bundle, to the posteroinferior division of the left bundle-branch. (bmj.com)
  • Due to the presence of an accessory bypass pathway that bridges the normal insulation between the atria and ventricles. (patient.info)
  • The pathway lies outside the atrioventricular node. (patient.info)
  • Orthodromic AVRT is the term given to an activation pattern in which the conduction is down the AV node and the retrograde conduction is in the accessory pathway. (patient.info)
  • In antidromic AVRT, which is rare, the direction of travel of the aberrant conduction is down the accessory pathway returning to the atrium through the AV node. (patient.info)
  • Intermittent retrograde conduction over an accessory pathway (AP) is an uncommon phenomenon. (elsevier.com)
  • Salerno-Uriarte, Jorge A. / Pacing site and bradycardia dependent retrograde conduction block over an atrioventricular accessory pathway . (elsevier.com)
  • Wolff-Parkinson-White syndrome ( WPW ) is a syndrome of pre-excitation of the ventricles of the heart due to an accessory pathway known as the bundle of Kent . (thefullwiki.org)
  • This accessory pathway is an abnormal electrical communication from the atria to the ventricles. (thefullwiki.org)
  • Sudden death due to WPW syndrome is rare (incidence of less than 0.6% [ 3 ] [ 4 ] ), and is due to the effect of the accessory pathway on tachyarrhythmias in these individuals. (thefullwiki.org)
  • Individuals with WPW syndrome have an accessory pathway that connects the atria and the ventricles, in addition to the AV node. (thefullwiki.org)
  • This accessory pathway is known as the bundle of Kent . (thefullwiki.org)
  • This accessory pathway does not share the rate-slowing properties of the AV node, and may conduct electrical activity at a significantly higher rate than the AV node. (thefullwiki.org)
  • In some cases, the combination of an accessory pathway and cardiac arrhythmias can trigger ventricular fibrillation, a leading cause of sudden cardiac death . (thefullwiki.org)
  • The short PR interval and slurring of the QRS complex is actually the impulse making it through to the ventricles prematurely (across the accessory pathway) without the usual delay experienced in the AV node. (thefullwiki.org)
  • In individuals with WPW syndrome, electrical activity that is initiated in the SA node travels through the accessory pathway as well as through the AV node to activate the ventricles via both pathways. (thefullwiki.org)
  • Block in the accessory pathway was obtained in 1 of the 2 patients with Wolff-Parkinson-White syndrome. (meta.org)
  • This brief case presents a well patient in whom an electrocardiograph abnormality consistent with an accessory pathway was found during a routine procedure. (pubmedcentralcanada.ca)
  • The case prompts and provides revision of accessory pathway disorders and what should be done in an emergency. (pubmedcentralcanada.ca)
  • These are features of 'pre-excitation' and occur when there is an accessory pathway within the heart. (pubmedcentralcanada.ca)
  • The abnormalities are marked on this figure to show the key electrocardiographic features of an accessory pathway, such as Wolff-Parkinson-White syndrome. (pubmedcentralcanada.ca)
  • Wolff-Parkinson-White (WPW) syndrome is the most common 'pre-excitation' syndrome, in which an abnormal accessory pathway connects the atria and ventricles, located in the atrioventricular sulcus. (pubmedcentralcanada.ca)
  • 1 Sometimes called the bundle of Kent, this pathway allows atrial electrical activity to circumvent the His-Purkinje system, conducting in an antegrade, retrograde or bidirectional manner. (pubmedcentralcanada.ca)
  • In some cases this is because conduction through the accessory pathway is intermittent. (pubmedcentralcanada.ca)
  • 3 - 5 Occasionally, the accessory pathway activates the ventricle at the same time as conduction from the atrioventricular node (AVN), meaning pre-excitation is absent and the ECG appears normal. (pubmedcentralcanada.ca)
  • The conducting properties of the accessory pathway can allow circus movement of electrical impulses between the atria and ventricle. (pubmedcentralcanada.ca)
  • Differences in accessory pathway location by sex and race. (nih.gov)
  • The etiology of accessory pathway (AP) formation is generally unknown. (nih.gov)
  • Proportions of males and females with at least one accessory pathway in a left posterior location or right annular location. (nih.gov)
  • Proportions of Asians and all non-Asians with at least one right anterior accessory pathway. (nih.gov)
  • Odds ratios of having at least one right anterior accessory pathway in Asian, White, Black and Latino patients compared to the rest of the population after adjusting for age and sex. (nih.gov)
  • The signal then moves back down the AV node to the ventricles and purkinje fibers, contracts the ventricles, and goes back up that accessory pathway. (osmosis.org)
  • The most common type of AVRT is Wolff-Parkinson-White syndrome , where the accessory pathway is called the Bundle of Kent. (osmosis.org)
  • This type of reentry is known as an anatomical reentrant circuit because the accessory pathway is a fixed, anatomically-defined pathway. (osmosis.org)
  • Successful catheter ablation of an anteroseptal accessory pathway without impairing the atrioventricular conduction. (readbyqxmd.com)
  • Age-related location of manifest accessory pathway and clinical consequences. (readbyqxmd.com)
  • Accessory pathway (AP) ablation is not always easy. (readbyqxmd.com)
  • ICE allowed a better mapping of the mitral ring and a more effective catheter ablation manipulation and tip contact which resulted in a persistent and complete ablation of the accessory pathway with a shorter time of fluoroscopic exposure. (biomedcentral.com)
  • Left-sided accessory pathway (LSAP) may be ablated using two different modalities: conventional approach through the aortic valve, or transseptal puncture of the fossa ovalis. (biomedcentral.com)
  • Preexcitation syndromes describe the presence of an additional, accessory pathway which bypasses the normal conduction route. (cardionetics.com)
  • The most significant of these syndromes is Wolff-Parkinson-White syndrome , in which the accessory pathway is called the Bundle of Kent . (cardionetics.com)
  • SVT (e.g. atrial fibrillation) traveling antegrade through an accessory pathway c. (teachim.org)
  • depolarization of ventricular myocardium will start where the accessory pathway inserts into the ventricle, and the impulse will spread slowly because it will propagate outside of the conduction system. (ecgwaves.com)
  • Individuals with accessory pathways (Kent's bundle) only display pre-excitation on the ECG when impulses are actually conducted over the accessory pathway. (ecgwaves.com)
  • In most individuals with accessory pathways the conduction over the pathway is intermittent, meaning that pre-excitation may not be seen at all times. (ecgwaves.com)
  • This is a rapid tachyarrhythmia in which a macroscopic re-entry circuit which involves the atria, atrioventricular node, accessory pathway and the ventricles. (ecgwaves.com)
  • In 1943, anatomical accessory pathway of conducting tissue has been described that bypasses the atrioventricular (AV) conduction system. (lecturio.com)
  • Multiple accessory pathways in the young: the impact of structural heart disease. (biomedsearch.com)
  • BACKGROUND: The presence of multiple accessory pathways (MultAP) is described in structural heart disease (SHD) such as Ebstein's anomaly and cardiomyopathies. (biomedsearch.com)
  • Electrophysiological study (EPS) was used to locate accessory pathways (APs) and categorize the patients according to the AP locations (septal, left and right free wall). (biomedsearch.com)
  • These (abnormal) pathways are known as accessory atrioventricular muscular connections. (ahajournals.org)
  • Anatomic and electrophysiologic relation between the coronary sinus and mitral annulus: implications for ablation of left-sided accessory pathways. (springer.com)
  • Coronary sinus-ventricular accessory connections producing posteroseptal and left posterior accessory pathways: incidence and electrophysiological identification. (springer.com)
  • Ventricular preexcitation, a feature of Wolff-Parkinson-White syndrome, is caused by accessory myocardial pathways that bypass the annulus fibrosus. (semanticscholar.org)
  • Approximately 30% of all accessory pathways are located in the "septal" area. (bmj.com)
  • As these pathways are close to the atrioventricular node, there is an increased risk of right bundle branch block or inadvertent complete atrioventricular block during catheter ablation. (bmj.com)
  • As cryothermy energy has the ability to reversibly show loss of function of tissue with cooling ("ice mapping") at less negative temperatures, and progressive ice formation at the catheter tip causes adherence to the adjacent tissue, this ablation method potentially has advantages over RF for safe ablation of septal accessory pathways. (bmj.com)
  • 2- 4 In this retrospective study we compare transvenous RF with cryoablation in patients with septal accessory pathways. (bmj.com)
  • Between January 2000 and October 2001, 15 patients were treated with RF and the next consecutive nine patients with cryoablation for septally located accessory pathways. (bmj.com)
  • The final classification of the accessory pathways was made according to the successful ablation site on fluoroscopy. (bmj.com)
  • Locations of accessory pathways in the RF and cryogroup were left posteroseptal in six versus one, right posteroseptal in seven versus two, midseptal in one versus two, and anteroseptal in one versus two patients, respectively. (bmj.com)
  • Electrocardiogram in patients with fasciculoventricular pathways: a comparative study with anteroseptal and midseptal accessory pathways. (ahajournals.org)
  • Accessory pathways may not require any treatment, but those causing symptoms may be treated with medication including calcium channel antagonists, beta blockers or flecainide. (wikipedia.org)
  • Alternatively, the electrical conduction through an accessory pathways can be abolished using catheter ablation, potentially offering a permanent cure. (wikipedia.org)
  • The most common sites for accessory pathways are connections between muscle tissue in the atria and the ventricles (atrio-ventricular pathways), bypassing the atrioventricular node. (wikipedia.org)
  • Rarer sites include connections between atrial muscle and the conducting tissue within the ventricles (atrio-fascicular pathways), between the atrioventricular node and the muscle tissue of the ventricle (nodo-ventricular pathways), and between the conducting tissue of the ventricle and the ventricular muscle (fasciculo-ventricular pathways). (wikipedia.org)
  • These rarer accessory pathways are sometimes collectively referred to as Mahaim pathways or Mahaim fibres. (wikipedia.org)
  • Mahaim pathways are typically seen on the right side of the heart, with their ventricular connection lying within or close to the right bundle branch. (wikipedia.org)
  • Besides this morbidity, these tachycardias can lead sudden cardiac arrest in 2.2% to 4.5% of patients with accessory pathways [ 1 , 3 , 4 ]. (omicsonline.org)
  • The 36 patients had 48 accessory pathways. (ahajournals.org)
  • Twenty-seven patients had bidirectional and 9 had unidirectional accessory pathways. (ahajournals.org)
  • 5 6 7 8 9 10 11 To examine the implications for radiofrequency ablation, we evaluated the contribution of the fast and slow AV node pathways and accessory pathways in a consecutive series of patients assessed for arrhythmia associated with the Wolff-Parkinson-White syndrome. (ahajournals.org)
  • Ventricular pre-excitation activity is defined as a premature activity of a part or of the entire ventricular myocardium, through a supraventricular impulse, occurred through connections or accessories pathways, which are short-circuiting the normal way of impulse conduction. (doctortipster.com)
  • Accessory pathways are composed of myocardial fibers with conduction velocity and refractory period lower than the structures of His bundle and of atrioventricular node. (doctortipster.com)
  • Background: Atrioventricular accessory pathways (APs) in dogs have been reported rarely. (elsevier.com)
  • Clinical Importance/Conclusions: Accessory pathways are challenging to recognize in dogs because of nonspecific clinical signs, frequency of concealed APs that show no evidence of their presence during sinus rhythm, and intermittent occurrence of tachyarrhythmias resulting from APs. (elsevier.com)
  • ANV re entry, and accessory pathways such as WPW and AB block first, second or third degree. (brainscape.com)
  • LVH, accessory pathways and congenital HD. (brainscape.com)
  • Due to the presence of two functionally and anatomically distinct conducting pathways in the atrioventricular node, one of which is fast-conducting, the other slow-conducting. (patient.info)
  • Accessory pathways may be capable of antegrade or retrograde conduction, or both. (patient.info)
  • Slowly conducting accessory pathways frequently yield RV entrainment criteria traditionally attributable to AV node reentry. (nih.gov)
  • Abnormally rapid heartbeats caused by reentrant conduction over the accessory pathways between the HEART ATRIA and the HEART VENTRICLES. (umassmed.edu)
  • The impulse can also travel in the reverse direction, as in some cases, atrial impulses travel to the ventricles over the accessory pathways and back to the atria over the BUNDLE OF HIS and the ATRIOVENTRICULAR NODE. (umassmed.edu)
  • Here, we briefly discuss accessory pathways, and the dangers of arrhythmias occurring within this setting. (pubmedcentralcanada.ca)
  • The action potential runs from the sinus node (SN) via right atrial pathways through the atrioventricular node (AVN) and the His bundle down the Purkinje fibers (His-Purkinje system, HPS) to the ventricular myocardium. (statpearls.com)
  • [6] Patients with Ebstein anomaly are prone to supraventricular tachyarrhythmias because of multiple accessory pathways. (statpearls.com)
  • Accurate Localization and Catheter Ablation of Superoparaseptal Accessory Pathways. (readbyqxmd.com)
  • There remains some confusion delineating the accurate location and the detailed anatomic relationship between atrioventricular accessory pathways (APs) located in the superoparaseptal region. (readbyqxmd.com)
  • Between 2009 and 2016, 11 patients with superoparaseptal accessory pathways (SPS-APs) were identified in 129 consecutive patients who underwent catheter ablation for APs in our center. (readbyqxmd.com)
  • Data regarding catheter ablation of anteroseptal accessory pathways through the aortic cusps are limited. (readbyqxmd.com)
  • We describe two cases of true para-Hisian accessory pathways successfully ablated from the aortic cusps (right coronary cusp and non-coronary cusp, respectively) along with a review of the current literature. (readbyqxmd.com)
  • Due to the close proximity to the atrioventricular node and the high risk of complication, mapping of the aortic cusps should always be considered in the case of anteroseptal accessory pathways. (readbyqxmd.com)
  • Anteroseptal accessory pathways can be safely and effectively ablated from the aortic cusps with good long-term outcomes. (readbyqxmd.com)
  • BACKGROUND: Typical atrioventricular accessory pathways (APs) are composed of myocardial cells. (usda.gov)
  • Accessory pathways occur at all points along the AV ring, and usually occur as isolated abnormalities, although a proportion of patients have associated congenital abnormalities. (ac.ke)
  • Left-sided accessory pathways (LSAP) can be ablated by using two different modalities: retrograde approach through the aortic valve and transseptal approach with puncture of the fossa ovalis. (biomedcentral.com)
  • Similarly, one of the pathways stimulates the atrioventricular node (AVN) present at the base of right atrium and limited by the coronary sinus, the atrial septum and the tricuspid valve (Koch's triangle). (drbeen.com)
  • These pathways are termed accessory pathways (or bundle of Kent ). (ecgwaves.com)
  • Accessory pathways (Kent's bundle) may be able to conduct the impulse from the atria to the ventricles ( antegrade direction ), from the ventricles to the atrial ( retrograde direction ) or both. (ecgwaves.com)
  • Accessory pathways do not display the slow conduction that the atrioventricular node does, and this means that any impulse reaching the accessory pathways may travel directly to the ventricles without any delay. (ecgwaves.com)
  • The conductive system is organized so that transmission is slightly delayed at the atrioventricular node, thus allowing time for the atria to empty their contents into the ventricles before the ventricles begin to contract. (thefreedictionary.com)
  • 8 In the late fetal, neonatal, and adult heart, the only remaining myocardial continuity between atrial and ventricular myocardium is the atrioventricular axis of conduction, comprising the specialized myocardium of the atrioventricular node and bundle. (ahajournals.org)
  • Of more serious note, the conduction from the atria to the ventricles normally occurs via the atrioventricular node (AV node). (wines.com)
  • These findings demonstrate that the level of pre-excitation is below the level of the atrioventricular node. (ahajournals.org)
  • 1 They take off below the atrioventricular node (from the His bundle or bundle branches) and insert directly into the ventricular septum, resulting in pre-excitation that is often subtle. (ahajournals.org)
  • The 3 findings taken together confirm that pre-excitation occurs below the level of the atrioventricular node and therefore the presence of an FVAP. (ahajournals.org)
  • 3 There is also no concern for 1-to-1 conduction of atrial fibrillation because the atrioventricular node is present to protect against this. (ahajournals.org)
  • LGL syndrome was originally thought to be due to an abnormal electrical connection between the atria and the ventricles, but is now thought to be due to accelerated conduction through the atrioventricular node in the majority of cases. (wikipedia.org)
  • Whilst in a minority of cases some form of intranodal or paranodal fibers that bypass all or part of the atrioventricular node can be found with subsequent conduction down the normal His-Purkinje system, in most cases the short PR interval is caused by accelerated conduction through the atrioventricular node. (wikipedia.org)
  • James bundle , connecting atrial myocardium with the lower third of the atrioventricular node or His bundle. (doctortipster.com)
  • Mahaim bundle , which makes the connection between the bottom of the atrioventricular node and the interventricular septum. (doctortipster.com)
  • This bypass tract avoids the atrioventricular node (AVN) permitting premature ventricular activation hence the term pre-excitation. (bmj.com)
  • Reentry occurs at the level of a macrocircuit including atrioventricular node (where impulse is driven anterograde) and an accessory atrioventricular bundle (where impulse is conducted retrograde). (doctortipster.com)
  • Beats conducted through the atrioventricular node always had a short HV interval (20 ms) and QRS complexes of left anterior hemiblock pattern. (bmj.com)
  • Patients who have AVNRT generally have dual atrioventricular nodal physiology and the ability for a reentrant arrhythmia to occur involving the atrioventricular (AV) node and the perinodal tissue. (cancertherapyadvisor.com)
  • This type of SVT originates from the atrioventricular node, or bundle of His. (patient.info)
  • Neither the sinus nor the atrioventricular node plays a role in the initiation or continuation of this type of SVT. (patient.info)
  • In normal individuals, electrical activity in the heart is initiated in the sinoatrial (SA) node (located in the right atrium ), propagates to the atrioventricular (AV) node, and then through the bundle of His to the ventricles of the heart. (thefullwiki.org)
  • The NCT's are due to rapid activation of the ventricles via the normal intrinsic conduction system, thus originate at or above the atrioventricular (AV) node. (renalandurologynews.com)
  • Normally, an electrical signal starts at the sinoatrial or SA node in the right atrium and propagates out through both atria, including bachmann's bundle in the left atrium, and then contracts both atria. (osmosis.org)
  • It's then delayed just a little bit as it goes through the atrioventricular, or AV node, before it passes through the Bundle of His and on to the Purkinje fibers of the left and right ventricles, causing them to contract as well. (osmosis.org)
  • There is in fact a "filter" between the atria and ventricles called the "atrioventricular node", or "AV node", which induces a phase shift between the contraction of the atria and that of the ventricles. (rythmopole.paris)
  • The AV node and His bundle normally act as the sole route of electrical conduction. (ac.ke)
  • Normally, the electrical impulse causing the heart to beat begins in the sinoatrial node -- the pacemaker of the heart located in the right atrium (one of the heart's top two chambers) -- is transmitted to the ventricles (the heart's bottom two chambers) and then passes through the atrioventricular (AV) node into the AV bundle. (petmd.com)
  • The ventricles are depolarised earlier than normal because conduction has not been slowed by the atrioventricular node . (cardionetics.com)
  • Bundles of fibers arise from the AV node, pierce the atrioventricular septum and enter the ventricles. (drbeen.com)
  • Upon cessation of high frequency impulses from SA node, as happens during bundle blocks, the AV node is shown to beat at its own inherent frequency. (drbeen.com)
  • The atrioventricular node and bundle of His are normally the only communication between the atria and the ventricles. (ecgwaves.com)
  • The atrial impulse must pass through the atrioventricular node, which delays the impulse due to its slow conduction, before the impulse may reach the ventricles. (ecgwaves.com)
  • In orthodromic AVRT the re-entry impulse circulates in antegrade direction through the atrioventricular node. (ecgwaves.com)
  • In antidromic AVRT the impulse travels in retrograde direction through the atrioventricular node. (ecgwaves.com)
  • Because of the catheter adherence, incremental atrial pacing and ventricular extrastimulus testing were used to show preserved normal atrioventricular conduction and decremental concentric ventriculatrial conduction, respectively. (bmj.com)
  • It is well established that during early cardiac development the ordinary atrial myocardium is continuous with myocardium of the ventricles throughout the atrioventricular junction. (ahajournals.org)
  • For instance, in the example above, if an individual had an atrial rate of 300 beats per minute, the accessory bundle may conduct all the electrical impulses from the atria to the ventricles, causing the ventricles to activate at 300 beats per minute. (thefullwiki.org)
  • In the ventricles, the fibers recollect and divide into two bundles that run down the interventricular septum. (drbeen.com)
  • Afterwards, he was treated with radiofrequency ablation of Kent's bundle, with permanent positive results so far (Figure 1). (omicsonline.org)
  • Electrophysiology studies and arrhythmia ablation can be tricky to report due to the number of bundled and add-on codes. (aapc.com)
  • Elective treatment of Wolff-Parkinson-White syndrome, in the patients with symptoms, is the ablation of the accessory bundle with radiofrequency current. (doctortipster.com)
  • Lisboa da Silva RMF, Roever L (2016) Typical Atrioventricular Nodal Reentrant and Orthodromic Atrioventricular Tachycardias: Electrocardiographic, Electrophysiological Diagnosis and Treatment. (omicsonline.org)
  • Muscular bridges crossing the fibrous atrioventricular skeleton can cause the Wolff-Parkinson-White syndrome in Ebstein patients. (statpearls.com)
  • a congenital cardiac defect in which both sides of the heart share the same atrioventricular orifice. (thefreedictionary.com)
  • congenital heart disease ( interatrial septal defect , ventricular septal defect , atrioventricular septal defect , patent ductus arteriosus , tetralogy of Fallot ) ventricular preexcitation syndrome, open heart surgery. (doctortipster.com)
  • Appearance of right bundle branch block (arrow), without an intermediate stage of normal ventricular activation, 26 seconds after ice mapping is started and a few seconds after −30°C was reached. (bmj.com)
  • Fortunately most complications were temporary, but one patient developed complete heart block and three patients developed a left bundle branch block, which may impact atrioventricular conduction over time. (acc.org)
  • QRS complex, has generally a normal appearance but may have a longer duration than normal if is associated with organic or functional bundle branch block. (doctortipster.com)
  • 120 ms, unless there is bundle branch block or an intraventricular conduction abnormality. (scielo.org.za)
  • Brugada P, Brugada J (1992) Right bundle branch block, persistent ST segment elevation and sudden cardiac death: a distinct clinical and electrocardiographic syndrome. (springer.com)
  • Cohen HC, Singer DH (1995) Bundle branch block and other forms of aberrant intraventricular conduction: clinical aspects. (springer.com)
  • Bundle Branch Block. (emedevents.com)
  • Distinguish the classic morphologies of complete right bundle branch block (cRBBB) and complete left bundle branch block (cLBBB). (emedevents.com)
  • You have any minor problem with your heart (first degree AtrioVentricular block or bundle branch block). (drugs-data.com)
  • In the Wolff-Parkinson-White (WPW) syndrome, AV conduction is through an AV bypass tract (the bundle of Kent). (wines.com)
  • Kent atrioventricular bundle , which makes a connection between the right atrium and right ventricle or between the left atrium and left ventricle. (doctortipster.com)
  • While the vast majority of individuals with a bundle of Kent remain asymptomatic throughout their entire lives, there is a risk of sudden death associated with the syndrome. (thefullwiki.org)
  • Anderson R, Ho S. Anatomy of the atrioventricular junctions with regard to ventricular preexcitation. (springer.com)
  • You have problems with your heart rhythm and do not have a pace maker (second or third degree AtrioVentricular block, sick sinus syndrome). (drugs-data.com)
  • 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)
  • Accessory atrioventricular myocardial connections in the developing human heart: relevance for perinatal supraventricular tachycardias. (semanticscholar.org)
  • Paroxysmal supraventricular tachycardias with narrow QRS are defined as rhythms originating from above the His bundle, heart rate higher 100 bpm and QRS complex of less than 120 ms in adults or less than 90 ms in children. (omicsonline.org)
  • Supraventricular tachycardias constitute all tachycardias that arise from above, or involving, the bundle of His. (clinicaladvisor.com)
  • Abstract The histogenesis of the separation between atrial and ventricular myocardium at the atrioventricular junction in the developing human heart has been investigated immunohistochemically by using monoclonal antibodies specific for atrioventricular cushion tissue, mesenchymal cells, atrial and ventricular myocardium, and myocardium of the primary ring. (ahajournals.org)
  • It was found that the insulation between the muscle masses of atrium and ventricle is established by the fusion of the tissues of the atrioventricular sulcus (located at the epicardial side of the junctional myocardium) with those of the atrioventricular cushions (located at the endocardial side of the junctional myocardium). (ahajournals.org)
  • This process takes place at the ventricular margin of the myocardium of the atrioventricular canal. (ahajournals.org)
  • The separation of atrial and ventricular myocardium starts at ≈7 weeks of development in the anteromedial portion of the right atrioventricular junction and is largely completed around the 12th week of development. (ahajournals.org)
  • The only remaining myocardial continuity between atrial and ventricular myocardium is the atrioventricular axis of conduction. (ahajournals.org)
  • 2 6 7 At these stages, the physical insulation by fibrous tissue is not essential owing to the intrinsic property of slow propagation of the cardiac impulse of the atrioventricular junctional myocardium. (ahajournals.org)
  • These are the atrial and ventricular myocardium, the myocardium of the atrioventricular canal, the atrioventricular cushion tissue, and the tissue of the atrioventricular groove. (ahajournals.org)
  • In the first, atrioventricular insulation is held to be established by invagination of the atrioventricular sulcus tissue into the myocardium of the atrioventricular canal. (ahajournals.org)
  • 12 13 Briefly, standard electrode catheters were positioned in the coronary sinus, the right ventricular apex, the high right atrium, and at the His bundle region. (ahajournals.org)
  • The electrophysiological study was performed off therapy using three diagnostic catheters (one decapolar and two quadripolars) which have been positioned in the coronary sinus (CS1 → CS5 = distal → proximal coronary sinus), His bundle region, and high right atrium/right ventricular apex. (biomedcentral.com)
  • Bachmann bundle - division of the anterior internodal tract that continues into the left atrium, providing a specialized path for interatrial conduction. (thefreedictionary.com)
  • Figure 1 presents ECG findings during normal atrioventricular impulse transmission as well as ECG findings during pre-excitation. (ecgwaves.com)
  • Subpulmonary stenosis with accessory atrioventricular tissue from both right and left atrioventricular valves. (documentaryheaven.com)
  • For example, VTs that arise within scar tissue located in the crest of the interventricular septum may "break into" (engage) the His bundle or proximal bundle branches early, and subsequent spread of electrical activation occurs via the His-Purkinje network, resulting in relatively narrower QRS complexes. (renalandurologynews.com)
  • Upon reaching the apex of the heart, the bundles of His give rise to Purkinje fibers that ascend along the ventricular walls in a fashion which allows for spread of electrical activity in an ascending fashion (from the apex to upwards). (drbeen.com)