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.
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)
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.
Abnormally rapid heartbeats with sudden onset and cessation.
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.

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)

The accessory atrioventricular (AV) bundle, also known as the bundle of Kent, is an abnormal electrical connection between the atria and ventricles of the heart. It is a type of accessory pathway that bypasses the normal AV node conduction system, allowing electrical impulses to travel directly from the atria to the ventricles.

This abnormal connection can lead to a type of arrhythmia called Wolff-Parkinson-White (WPW) syndrome, which is characterized by a short PR interval and a wide QRS complex on an electrocardiogram (ECG). WPW syndrome can cause palpitations, rapid heartbeat, and in some cases, may lead to more serious arrhythmias such as atrial fibrillation or atrial flutter.

Accessory AV bundles are typically congenital, meaning they are present from birth, but may not cause any symptoms until later in life. Treatment for WPW syndrome may include medication, catheter ablation to destroy the accessory pathway, or in some cases, surgery.

The Bundle of His is a bundle of specialized cardiac muscle fibers that conduct electrical impulses to the Purkinje fibers, which then stimulate contraction of the ventricles in the heart. It is named after Wilhelm His, Jr., who first described it in 1893.

The Bundle of His is a part of the electrical conduction system of the heart that helps coordinate the contraction of the atria and ventricles to ensure efficient pumping of blood. The bundle originates from the atrioventricular node, which receives electrical impulses from the sinoatrial node (the heart's natural pacemaker) and transmits them through the Bundle of His to the Purkinje fibers.

The Bundle of His is divided into two main branches, known as the right and left bundle branches, which further divide into smaller fascicles that spread throughout the ventricular myocardium. This ensures a coordinated contraction of the ventricles, allowing for efficient pumping of blood to the rest of the body.

The atrioventricular (AV) node is a critical part of the electrical conduction system of the heart. It is a small cluster of specialized cardiac muscle cells located in the lower interatrial septum, near the opening of the coronary sinus. The AV node receives electrical impulses from the sinoatrial node (the heart's natural pacemaker) via the internodal pathways and delays their transmission for a brief period before transmitting them to the bundle of His and then to the ventricles. This delay allows the atria to contract and empty their contents into the ventricles before the ventricles themselves contract, ensuring efficient pumping of blood throughout the body.

The AV node plays an essential role in maintaining a normal heart rhythm, as it can also function as a backup pacemaker if the sinoatrial node fails to generate impulses. However, certain heart conditions or medications can affect the AV node's function and lead to abnormal heart rhythms, such as atrioventricular block or atrial tachycardia.

The heart conduction system is a group of specialized cardiac muscle cells that generate and conduct electrical impulses to coordinate the contraction of the heart chambers. The main components of the heart conduction system include:

1. Sinoatrial (SA) node: Also known as the sinus node, it is located in the right atrium near the entrance of the superior vena cava and functions as the primary pacemaker of the heart. It sets the heart rate by generating electrical impulses at regular intervals.
2. Atrioventricular (AV) node: Located in the interatrial septum, near the opening of the coronary sinus, it serves as a relay station for electrical signals between the atria and ventricles. The AV node delays the transmission of impulses to allow the atria to contract before the ventricles.
3. Bundle of His: A bundle of specialized cardiac muscle fibers that conducts electrical impulses from the AV node to the ventricles. It divides into two main branches, the right and left bundle branches, which further divide into smaller Purkinje fibers.
4. Right and left bundle branches: These are extensions of the Bundle of His that transmit electrical impulses to the respective right and left ventricular myocardium. They consist of specialized conducting tissue with large diameters and minimal resistance, allowing for rapid conduction of electrical signals.
5. Purkinje fibers: Fine, branching fibers that arise from the bundle branches and spread throughout the ventricular myocardium. They are responsible for transmitting electrical impulses to the working cardiac muscle cells, triggering coordinated ventricular contraction.

In summary, the heart conduction system is a complex network of specialized muscle cells responsible for generating and conducting electrical signals that coordinate the contraction of the atria and ventricles, ensuring efficient blood flow throughout the body.

The accessory nerve, also known as the eleventh cranial nerve (XI), has both a cranial and spinal component. It primarily controls the function of certain muscles in the back of the neck and shoulder.

The cranial part arises from nuclei in the brainstem and innervates some of the muscles that help with head rotation, including the sternocleidomastoid muscle. The spinal root originates from nerve roots in the upper spinal cord (C1-C5), exits the spine, and joins the cranial part to form a single trunk. This trunk then innervates the trapezius muscle, which helps with shoulder movement and stability.

Damage to the accessory nerve can result in weakness or paralysis of the affected muscles, causing symptoms such as difficulty turning the head, weak shoulder shrugging, or winged scapula (a condition where the shoulder blade protrudes from the back).

Lown-Ganong-Levine Syndrome (LGLS) is a rare cardiac conduction disorder that is characterized by the presence of an accessory pathway in the heart, specifically located high in the atrioventricular (AV) septum. This pathway can cause premature excitation of the ventricles and may lead to various types of supraventricular tachycardia (SVT), such as atrioventricular reentrant tachycardia (AVRT) or atrial fibrillation (AFib) with a rapid ventricular response.

The key electrocardiogram (ECG) finding in LGLS is a short PR interval (

An encyclopedia is a comprehensive reference work containing articles on various topics, usually arranged in alphabetical order. In the context of medicine, a medical encyclopedia is a collection of articles that provide information about a wide range of medical topics, including diseases and conditions, treatments, tests, procedures, and anatomy and physiology. Medical encyclopedias may be published in print or electronic formats and are often used as a starting point for researching medical topics. They can provide reliable and accurate information on medical subjects, making them useful resources for healthcare professionals, students, and patients alike. Some well-known examples of medical encyclopedias include the Merck Manual and the Stedman's Medical Dictionary.

Wolff-Parkinson-White (WPW) Syndrome is a heart condition characterized by the presence of an accessory pathway or abnormal electrical connection between the atria (the upper chambers of the heart) and ventricles (the lower chambers of the heart). This accessory pathway allows electrical impulses to bypass the normal conduction system, leading to a shorter PR interval and a "delta wave" on the electrocardiogram (ECG), which is the hallmark of WPW Syndrome.

Individuals with WPW Syndrome may experience no symptoms or may have palpitations, rapid heartbeat (tachycardia), or episodes of atrial fibrillation. In some cases, WPW Syndrome can lead to more serious heart rhythm disturbances and may require treatment, such as medication, catheter ablation, or in rare cases, surgery.

It is important to note that not all individuals with WPW Syndrome will experience symptoms or complications, and many people with this condition can lead normal, active lives with appropriate monitoring and management.

Paroxysmal Tachycardia is a type of arrhythmia (abnormal heart rhythm) characterized by rapid and abrupt onset and offset of episodes of tachycardia, which are faster than normal heart rates. The term "paroxysmal" refers to the sudden and recurring nature of these episodes.

Paroxysmal Tachycardia can occur in various parts of the heart, including the atria (small upper chambers) or ventricles (larger lower chambers). The two most common types are Atrial Paroxysmal Tachycardia (APT) and Ventricular Paroxysmal Tachycardia (VPT).

APT is more common and typically results in a rapid heart rate of 100-250 beats per minute. It usually begins and ends suddenly, lasting for seconds to hours. APT can cause symptoms such as palpitations, lightheadedness, shortness of breath, chest discomfort, or anxiety.

VPT is less common but more serious because it involves the ventricles, which are responsible for pumping blood to the rest of the body. VPT can lead to decreased cardiac output and potentially life-threatening conditions such as syncope (fainting) or even cardiac arrest.

Treatment options for Paroxysmal Tachycardia depend on the underlying cause, severity, and frequency of symptoms. These may include lifestyle modifications, medications, cardioversion (electrical shock to restore normal rhythm), catheter ablation (destroying problematic heart tissue), or implantable devices such as pacemakers or defibrillators.

Electrocardiography (ECG or EKG) is a medical procedure that records the electrical activity of the heart. It provides a graphic representation of the electrical changes that occur during each heartbeat. The resulting tracing, called an electrocardiogram, can reveal information about the heart's rate and rhythm, as well as any damage to its cells or abnormalities in its conduction system.

During an ECG, small electrodes are placed on the skin of the chest, arms, and legs. These electrodes detect the electrical signals produced by the heart and transmit them to a machine that amplifies and records them. The procedure is non-invasive, painless, and quick, usually taking only a few minutes.

ECGs are commonly used to diagnose and monitor various heart conditions, including arrhythmias, coronary artery disease, heart attacks, and electrolyte imbalances. They can also be used to evaluate the effectiveness of certain medications or treatments.

... 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 ...
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 ...
Because the accessory pathway initiates conduction in the ventricles outside of the bundle of His, the QRS complex in ... These abnormal rhythms start from either the atria or atrioventricular node. They are generally due to one of two mechanisms: ... Wolff-Parkinson-White syndrome (WPW) is a relatively common abnormality with an accessory pathway, the bundle of Kent crossing ... An accessory "bypass tract" can avoid the AV node and its protection so that the fast rate may be directly transmitted to the ...
... 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 ...
Since AV-blockade may promote conduction over the accessory pathway, drugs such as beta blockers, calcium channel blockers, and ... This can lead to abnormal heart rhythms including atrioventricular re-entrant tachycardia.[citation needed] Other abnormalities ... block manifesting as a prolonged PR-interval low amplitude QRS complexes in the right precordial leads atypical right bundle ... About 50% of individuals with Ebstein's anomaly have an accessory pathway with evidence of Wolff-Parkinson-White syndrome, ...
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 electrical impulse generated in the ... 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. ...
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 ...
Accessory pathways that give rise to WPW syndrome and AVRT are located in the atrioventricular valvular rings. They provide a ... meaning that it originates from a location within the heart above the bundle of His. AV nodal reentrant tachycardia is the most ... The fast and slow pathways should not be confused with the accessory pathways that give rise to Wolff-Parkinson-White syndrome ... AVNRT occurs when a reentrant circuit forms within or just next to the atrioventricular node. The circuit usually involves two ...
... nerve abducens nucleus abducent abducent nerve abduction accessory bone accessory cuneate nucleus accessory nerve accessory ... Brunner's gland buccal fatpad buccal membrane buccal nerve buccinator bulbospongiosus bulbourethral gland bulbus bulla bundle ... muscle astereognosis asterion asterixis astrocyte asynergy ataxia atlanto-occipital joint atlas atresia atrioventricular node ... spina bifida spinal accessory nucleus spinal cord spinal lemniscus spinal nerve spine spine of the scapula spinocerebellar ...
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 ...
However, it may show wide QRS complexes on the ECG if a bundle branch block is present. At high rates, the QRS complex may also ... Definitive care may include catheter ablation.[citation needed] AV reentrant tachycardia (AVRT) requires an accessory pathway ... Adrenergic storm Anaemia Anxiety Atrial fibrillation Atrial flutter Atrial tachycardia Atrioventricular reentrant tachycardia ... where the impulse travels down the AV node to the ventricles and back up to the atria through the accessory pathway) or ...
The mitral valve and the tricuspid valve are known as the atrioventricular valves because they lie between the atria and the ... Occasionally, the anterior and posterior cusps close the orifice incompletely and a small additional accessory cusp is present ... is caused by an excess of connective tissue that thickens the spongiosa layer of the cusp and separates collagen bundles in the ... The mitral valve (/ˈmaɪtrəl/), also known as the bicuspid valve or left atrioventricular valve, is one of the four heart valves ...
The pacemaking signal travels through the right atrium to the atrioventricular node, along the bundle of His, and through the ... parasympathetic nervous system guided by integrated brainstem control from the vagus nerve and the thoracic spinal accessory ... the left bundle branch and the right bundle branch. The left bundle branch activates the left ventricle, while the right bundle ... 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 ...
... 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 ...
... 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 ...
1. Unusual accessory pathways: pathways with Mahaim characteristics can be atriofascicular, atrioventricular, nodofascicular ... HIS BUNDLE PACING Abhishek J. Deshmukh, M.D., Mayo Clinic, Rochester, MN, USA ...
... and His bundle recording, when performed treatment of supraventricular tachycardia by ablation of fast or slow atrioventricular ... accessory atrioventricular connection, cavo-tricuspid isthmus or other single atrial focus or source of atrial re-entry ... The reductions in time were significant for the bundled codes. Additional surveys were launched by ACC and HRS in the winter of ... Bundle of His, Drug Repositioning, Medicare, Heart Atria, Catheter Ablation, Tachycardia, Supraventricular, Tachycardia, ...
keywords = "Accessory atrioventricular pathway, Preexcitation, Right bundle branch block, TBX3, Ulnar-mammary syndrome, Wolff- ... Dichotomous roles of TBX3 in the establishment of atrioventricular conduction pathways in the human heart. / Nguyen, Hoang H.; ... Dichotomous roles of TBX3 in the establishment of atrioventricular conduction pathways in the human heart. In: HeartRhythm Case ... Dichotomous roles of TBX3 in the establishment of atrioventricular conduction pathways in the human heart. HeartRhythm Case ...
Atrioventricular Pathways, Accessory Bundle of Kent Bundle, Accessory Atrioventricular Bundle, Kent Bundles, Accessory ... Atrioventricular Pathways, Accessory. Bundle of Kent. Bundle, Accessory Atrioventricular. Bundle, Kent. Bundles, Accessory ... Accessory Atrioventricular Bundle Entry term(s). Accessory Atrioventricular Bundles Accessory Atrioventricular Pathway ... Accessory Conducting Pathways Atrioventricular Bundle, Accessory Atrioventricular Bundles, Accessory Atrioventricular Pathway, ...
Accessory Atrioventricular Bundle 19% 19 Scopus citations * Electrophysiological effects of ibutilide in patients with ... Dynamic Annular Modeling of the Unrepaired Complete Atrioventricular Canal Annulus. Nam, H. H., Dinh, P. V., Lasso, A., Herz, C ... Electrophysiologic study and radiofrequency ablation in patients with intracardiac tumors and accessory pathways: Is the tumor ... Endocardial stimulation of efferent parasympathetic nerves to the atrioventricular node in humans: Optimal stimulation sites ...
Accessory Atrioventricular Bundle 16% * Atrial Premature Complexes 16% * Ventricular Premature Complexes 15% ...
Activation is as follows: atrioventricular node, His-Purkinje system, ventricle, accessory pathway, atria. The P wave closely ... The resultant QRS complex is thus narrow (unless bundle branch block Bundle Branch Block and Fascicular Block Bundle branch ... QRS complex is narrow except with coexisting bundle branch block, antidromic tachycardia, or dual accessory connection ... In patients with 2 accessory AV connections (not uncommon), a reciprocating tachycardia using one accessory connection in the ...
... the atrioventricular nodal (AV) His-Purkinje system down into bundle branches, with the normal ECG pattern illustrated. ... B, limb-lead recording from a patient with ORT owing to a concealed left-lateral accessory pathway. Note the retrograde P wave ... AF, atrial fibrillation; AVNRT, atrioventricular nodal re-entry tachycardia; AVRT, atrioventricular re-entry tachycardia; EAT, ... The first surgical division of an accessory pathway (AP) was performed at Duke University by Will C. Sealy, MD, in 1968. The ...
In one patient RF ablation of two accessory atrioventricular pathways located in the left bottom and lateral wall was performed ... It was a good early effect of ablation-no conduction by bundle of Kent, but perhaps there is a His-Purkinje conduction (a real ... One patient underwent RF ablation of two accessory atrioventricular pathways located in the septal posterior wall and right ... children accessory atrioventricular pathway was diagnosed and RF ablation was performed. The mean age at the ablation was 12.1 ...
Accessory Atrioventricular Bundle. *Agenesis of Corpus Callosum. *Airway Remodeling. *Alopecia. *Atrial Remodeling ...
Atrioventricular reciprocating tachycardia was due to the involvement of a left lateral accessory pathway refractory to ... Radiofrequency transcatheter ablation of the left lateral Kent bundle in a premature newborn after 28 weeks of pregnancy with ... atrioventricular block (two patients), IART (seven patients), and IART with sinus node disease or atrioventricular block (four ... Feixe Acessório Atrioventricular , Ablação por Cateter , Gravidez , Masculino , Lactente , Recém-Nascido , Humanos , Feminino ...
... atrial impulses travel to the ventricles over the accessory pathways and back to the atria over the BUNDLE OF HIS and the ... During development, growth and fusion of endocardial cushions at midline forms the two atrioventricular canals, the sites for ... HN - 2008; use GENE PRODUCTS, VPR 1991-2007 BX - HIV vpr Gene Product MH - Viral Regulatory and Accessory Proteins UI - D054334 ... AN - general; prefer specifics HN - 2008 (1990) BX - Viral Accessory Proteins BX - Viral Regulatory Proteins MH - ...
... atrial impulses travel to the ventricles over the accessory pathways and back to the atria over the BUNDLE OF HIS and the ... During development, growth and fusion of endocardial cushions at midline forms the two atrioventricular canals, the sites for ... HN - 2008; use GENE PRODUCTS, VPR 1991-2007 BX - HIV vpr Gene Product MH - Viral Regulatory and Accessory Proteins UI - D054334 ... AN - general; prefer specifics HN - 2008 (1990) BX - Viral Accessory Proteins BX - Viral Regulatory Proteins MH - ...
... atrial impulses travel to the ventricles over the accessory pathways and back to the atria over the BUNDLE OF HIS and the ... During development, growth and fusion of endocardial cushions at midline forms the two atrioventricular canals, the sites for ... HN - 2008; use GENE PRODUCTS, VPR 1991-2007 BX - HIV vpr Gene Product MH - Viral Regulatory and Accessory Proteins UI - D054334 ... AN - general; prefer specifics HN - 2008 (1990) BX - Viral Accessory Proteins BX - Viral Regulatory Proteins MH - ...
... atrial impulses travel to the ventricles over the accessory pathways and back to the atria over the BUNDLE OF HIS and the ... During development, growth and fusion of endocardial cushions at midline forms the two atrioventricular canals, the sites for ... HN - 2008; use GENE PRODUCTS, VPR 1991-2007 BX - HIV vpr Gene Product MH - Viral Regulatory and Accessory Proteins UI - D054334 ... AN - general; prefer specifics HN - 2008 (1990) BX - Viral Accessory Proteins BX - Viral Regulatory Proteins MH - ...
Accessory Atrioventricular Bundles use Accessory Atrioventricular Bundle Accessory Atrioventricular Pathway use Accessory ... Accessory Conducting Pathway use Accessory Atrioventricular Bundle Accessory Conducting Pathways use Accessory Atrioventricular ... Accessory Atrioventricular Pathways use Accessory Atrioventricular Bundle Accessory Basal Amygdaloid Nucleus use Basolateral ... Accessory Pathway, Concealed use Accessory Atrioventricular Bundle Accessory Pathway, Fasciculoventricular use Accessory ...
Accessory Atrioventricular Bundles use Accessory Atrioventricular Bundle Accessory Atrioventricular Pathway use Accessory ... Accessory Conducting Pathway use Accessory Atrioventricular Bundle Accessory Conducting Pathways use Accessory Atrioventricular ... Accessory Atrioventricular Pathways use Accessory Atrioventricular Bundle Accessory Basal Amygdaloid Nucleus use Basolateral ... Accessory Pathway, Concealed use Accessory Atrioventricular Bundle Accessory Pathway, Fasciculoventricular use Accessory ...
Accessory Atrioventricular Bundles use Accessory Atrioventricular Bundle Accessory Atrioventricular Pathway use Accessory ... Accessory Conducting Pathway use Accessory Atrioventricular Bundle Accessory Conducting Pathways use Accessory Atrioventricular ... Accessory Atrioventricular Pathways use Accessory Atrioventricular Bundle Accessory Basal Amygdaloid Nucleus use Basolateral ... Accessory Pathway, Concealed use Accessory Atrioventricular Bundle Accessory Pathway, Fasciculoventricular use Accessory ...
Auriculoventricular accessory pathway syndrome, False bundle branch block syndrome, Preexcitation syndrome, Ventricular Pre- ... Other Names: Anomalous Atrioventricular Excitation, Anomalous a-V Excitation, Anomalous ventricular excitation syndrome, ... In people with Wolff-Parkinson-White syndrome, there is an extra, or accessory, pathway that may cause a very rapid heart rate ... more complicated accessory electrical pathways in the heart, and more severe tachycardia symptoms. However, even for those at ...
G � Left bundle-branch block Electrical activity from the atrioventricular node travels down the bundle of His. D � Dermatitis ... This accessory pathway is ready to conduct atrial depolarisation to the ventricular myocardium faster than the atrioventricular ... The Wenckebach phenomenon occurs secondary to impaired conduction along the proximal bundle of His. Causes of third-degree ... Only sporadic impulses from the sinoatrial node depolarize the atrioventricular node and ventricular myocardium, inflicting the ...
A) atrioventricular bundle. B) atrioventricular branches. C) subendocardial conducting network (Purkinje fibers). D) sinoatrial ... B) Accessory nerve-spinal part. C) Vagus nerve. D) Trigeminal nerve. E) Hypoglossal nerve ... A) atrioventricular bundle. B) bundle branch. C) internodal pathway. D) sinoatrial node ... The atrioventricular node is located in the. A) right atrium, just inferior to the opening of the superior vena cava.. B) ...
... 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 ... Comparison of strategies for catheter ablation of focal atrial tachycardia originating near the His bundle region. Heart Rhythm ... To locate the accessory pathway (AP), the initial 40 milliseconds of the QRS (delta wave) are evaluated. Note that the delta ...
Accessory Atrioventricular Bundle [C23.300.190] * Cerebral Cortical Thinning [C23.300.220] * Choristoma [C23.300.250] ...
Bundle of His. Bundle of His, also known as the atrioventricular (AV) bundle, is a collection of special myocytes that conducts ... Decremental conduction properties in overt and concealed atrioventricular accessory pathways. Europace. 2000 Jan;2(1):42-53. ... Atrioventricular node , Kenhub. *Patra C, Zhang X, Brady MF. Physiology, Bundle of His. [Updated 2022 May 8]. In: StatPearls [ ... Bundle Branch Block: It is a condition characterized by delay in the conduction of the cardiac impulse across the Bundle of His ...
Incomplete atrioventricular block 426.2 Left bundle branch hemiblock 426.3 Other left bundle branch block 426.4 Right bundle ... Anomalous atrioventricular excitation Atrioventricular conduction: Wolff-Parkinson-White syndrome accelerated accessory pre- ... accessory) (nasal) empyema, acute, of sinus (accessory) (nasal) infection, acute, of sinus (accessory) (nasal) inflammation, ... accessory) (nasal) empyema (chronic) of sinus (accessory) (nasal) infection (chronic) of sinus (accessory) (nasal) suppuration ...
Catheter ablation of accessory atrioventricular pathways (Wolff- Parkinson-White syndrome) by radiofrequency current. N Engl J ... the most common bypass tract is an accessory AV pathway otherwise known as a Kent bundle. This is the anomaly seen in WPW ... but via an extra atrioventricular (AV) muscular connection, termed an accessory pathway (AP), that bypasses the AV node. [4, 7 ... of the accessory pathway and the normal atrioventricular (AV) nodal and His Purkinje conduction system ...
Left bundle branch block (LBBB) with a QRS duration , 130 ms, left ventricular ejection fraction , 30%, and NYHA Functional ... NYHA Functional Class I, II, or III and who have left ventricular ejection fraction ≤ 50% and atrioventricular block (AV block ... Antitachycardia pacing (ATP) therapy is contraindicated in patients with an accessory antegrade pathway. Medtronic Kappa™ 400 ... Anti-tachycardia pacing (ATP) therapy is contraindicated in patients with an accessory antegrade pathway. ...
Accessory Atrioventricular Bundle. *Agenesis of Corpus Callosum. *Airway Remodeling. *Alopecia. *Atrial Remodeling ...
  • 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)
  • Accessory pathway reentrant tachycardia involves tracts of conducting tissue that partially or totally bypass normal AV connections (bypass tracts). (msdmanuals.com)
  • In 1930, Wolff, Parkinson, and White described a series of young patients who had a bundle branch block pattern on electrocardiography (ECG), a short PR interval, and paroxysms of tachycardia. (rjmatthewsmd.com)
  • This can lead to an Atrioventricular reentrant tachycardia which may pass anterogradely or retrogradely through the AV node and accessory pathway. (abcmedicalnotes.com)
  • This can present with palpitations or syncope from an atrioventricular reciprocating tachycardia or rarely sudden death secondary to ventricular fibrillation from rapid conduction of atrial fibrillation across the accessory pathway. (escardio.org)
  • Ventricular depolarization starts earlier than expected (it starts where the accessory pathway inserts in the ventricular tachycardia). (wchcmr.org)
  • An unusual case of non-reentrant atrioventricular nodal tachycardia. (jefferson.edu)
  • 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)
  • WPW (preexcitation) syndrome is the most common accessory pathway SVT, occurring in about 1 to 3/1000 people. (msdmanuals.com)
  • In classic (or manifest) WPW syndrome, antegrade conduction occurs over both the accessory pathway and the normal conducting system during sinus rhythm. (msdmanuals.com)
  • When there is a disturbance in the normal conduction through the fast pathway, the slow pathway may be activated to conduct the excitation wave to the bundle of His, as well as retrograde back to the fast one, and then back again down the slow pathway continuously to produce the PSVT (see Figure 1). (rjmatthewsmd.com)
  • In people with Wolff-Parkinson-White syndrome, there is an extra, or accessory, pathway that may cause a very rapid heart rate. (rareguru.com)
  • Antitachycardia pacing (ATP) therapy is contraindicated in patients with an accessory antegrade pathway. (medtronic.com)
  • Those that have WPW syndrome have ventricular pre-excitation caused by an accessory conduction pathway. (picmonic.com)
  • Definitive treatment of Wolff-Parkinson-White requires procedural ablation of the accessory pathway. (picmonic.com)
  • In WPW, an accessory conduction pathway exists which directly connects the atria and ventricles. (picmonic.com)
  • This pathway is called the "bundle of Kent. (picmonic.com)
  • Avoid AV node blocking agents like adenosine and beta blockers as these agents further promote conduction through the accessory pathway and increase the risk of ventricular fibrillation. (picmonic.com)
  • IN WPW an accessory pathway that only conducts retrogradely (i.e. no resting ECG delta wave) is called a CONCEALED pathway and those with antegrade conduction where the delta wave is obvious is called a MANIFEST pathway. (abcmedicalnotes.com)
  • WPW - there is an abnormal electrical connection between atrium and ventricle (e.g. bundle of Kent) - this is called an accessory pathway. (abcmedicalnotes.com)
  • May be an RSR pattern in V1 with Type A however there are several different types depending on location of accessory pathway. (abcmedicalnotes.com)
  • AF conducted to Ventricle across accessory pathway: irregularly irregular + delta wave. (abcmedicalnotes.com)
  • The arrhytmia can be antidromic (going down the AVNode and then back via accessory pathway) or antidromic going the opposite direction. (abcmedicalnotes.com)
  • AF + delta down accessory pathway vent rate 200+. (abcmedicalnotes.com)
  • Patients presenting with pre-excited AF once managed should be referred for definitive treatment which is radiofrequency catheter ablation of the accessory pathway, not only to eliminate symptoms of palpitations but also to eliminate the risk of sudden death. (abcmedicalnotes.com)
  • This accessory pathway, the Bundle of Kent, creates a shortcut from the atria to the ventricles, resulting in faster electrical transmission. (facty.com)
  • The accessory pathway may produce a rapid heart rate or arrhythmia, an irregular heartbeat. (facty.com)
  • The accessory pathway in Wolff-Parkinson-White syndrome is a structural defect of the heart that occurs as the organ forms in utero. (facty.com)
  • Pre-excitation means that there is an accessory pathway between the atria and ventricles and the electrical impulse can therefore bypass the AV node. (wchcmr.org)
  • n\nPeople with Wolff-Parkinson-White syndrome are born with an extra connection in the heart, called an accessory pathway, that allows electrical signals to bypass the atrioventricular node and move from the atria to the ventricles faster than usual. (nih.gov)
  • The accessory pathway may also transmit electrical impulses abnormally from the ventricles back to the atria. (nih.gov)
  • n\nComplications of Wolff-Parkinson-White syndrome can occur at any age, although some individuals born with an accessory pathway in the heart never experience any health problems associated with the condition. (nih.gov)
  • 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)
  • Cells of the conducting system located between the AV node and bundle branches. (easynotecards.com)
  • The major components of the human heart conduction system include the sinoatrial node, atrioventricular node, Bundle of His, and Purkinje fibers. (microbenotes.com)
  • Bundle of His, also known as the atrioventricular (AV) bundle , is a collection of special myocytes that conducts the cardiac impulse from the AV node to the Purkinje Fiber for conduction across the ventricles. (microbenotes.com)
  • In normal cardiac conduction, the atria and ventricles are electrically separate from one another, and electrical impulses must pass through the atrioventricular (AV) node and His-Purkinje system. (picmonic.com)
  • Patients with WPW and other "pre-excitation" syndromes have alternative, or "accessory" pathways which allow electricity to flow directly from the atria to the ventricles, bypassing the AV node and leading to "premature" activation of the ventricles. (picmonic.com)
  • In AVRT, the electrical signal passes from the AV node to the ventricles in the normal fashion but subsequently passes back into the atria through the bundle of Kent - hence the name, "reentrant. (picmonic.com)
  • The electrical signal then travels to the ventricles via the atrioventricular (AV) node, resulting in ventricular contraction. (facty.com)
  • A type of atrial arrhythmia characterized by atrial rates of between 240 and 400 beats per minute and some degree of atrioventricular node conduction block. (nih.gov)
  • A specialized cluster of cells called the atrioventricular node conducts electrical impulses from the heart's upper chambers (the atria) to the lower chambers (the ventricles). (nih.gov)
  • Impulses move through the atrioventricular node during each heartbeat, stimulating the ventricles to contract slightly later than the atria. (nih.gov)
  • Reentrant supraventricular tachycardias (SVT) involve reentrant pathways with a component above the bifurcation of the His bundle. (msdmanuals.com)
  • If these maneuvers are ineffective, treatment is with IV adenosine or nondihydropyridine calcium channel blockers for narrow QRS rhythms or for wide QRS rhythms known to be a reentrant SVT with aberrant conduction that requires atrioventricular nodal conduction. (msdmanuals.com)
  • Supraventricular tachycardias (SPVT) usually have narrow QRS complexes, but they may be wide because of aberrant counduction through the intraventricular conducting tissue, participation of a bypass tract in the intraventricular depolarization pattern,or in the presence of a coexiting bundle branch block. (rjmatthewsmd.com)
  • the right bundle branch transmits the impulse to the Purkinje Fiber of the right ventricle, and the left bundle branch transmits the impulse to the Purkinje Fiber of the left ventricle. (microbenotes.com)
  • Of note, supraventricular tachcardia with "aberrancy" refers to usually SVT with a bundle branch block. (wchcmr.org)
  • There is an atypical left bundle branch block (LBBB) -- atypical because the R-wave in V6 is not all upright. (blogspot.com)
  • Threadlike structures of the endocardium that prevent prolapse of the atrioventricular valves. (easynotecards.com)
  • The atrioventricular (AV) valves derive embryologically, in significant part, from the wall of the ventricle into which they enter. (medscape.com)
  • Identify the letter that indicates the location of the bundle branches. (easynotecards.com)
  • In 1943, the existence of an accessory connection between atria and ventricles was confirmed, which is about 50 years after Kent's description of myocardial fibers that were believed to conduct from atria to ventricle. (rjmatthewsmd.com)
  • 240 bpm in cats) and require atrial or atrioventricular junctional tissue for its initiation and maintenance. (vin.com)
  • Identify the letter that indicates the left atrioventricular valve. (easynotecards.com)
  • Left ventricular accessory chamber: a case report and review of the literature. (rush.edu)
  • Supraventricular atrioventricular (AVRT) or nodal (AVNRT) reciprocating tachycardias are common in patients with CHD. (ecrjournal.com)
  • This symptom complex is characterized by a double excitation of the heart chambers caused by pre-excitation (antesystole) along existing accessory excitation pathways bypassing the normal, i.e. orthodromic, AV conduction pathway (Figure 1). (medscape.com)
  • 15. Risk of coronary artery injury with radiofrequency ablation and cryoablation of epicardial posteroseptal accessory pathways within the coronary venous system. (nih.gov)
  • It has been estimated that most accessory pathways (60 to 75 percent) are capable of bidirectional conduction (antegrade and retrograde) between the atrium and ventricle. (medilib.ir)
  • However, some accessory pathways (17 to 37 percent) are only capable of conduction in a retrograde fashion from ventricle to atrium [ 2 ]. (medilib.ir)
  • The vast majority of concealed accessory pathways are left-sided [ 3 ]. (medilib.ir)
  • In some patients with left free wall accessory pathways, pacing the left atrium via the coronary sinus, in an area closer to the accessory pathway, may be necessary to bring out antegrade accessory pathway conduction and overt preexcitation. (medilib.ir)
  • Electrophysiological evaluation in (he control state demonstrated a single, left posterior free‐wall atrioventricular accessory pathway. (nebraska.edu)
  • Weber k, pfister h clinical management of calcium are also voltage sensitive but are typically caused by the accessory pathway only conducts backwards from the alpha cells of the initiating insult can have widespread effects or to a parent, or an anterior and posterior urethra. (albionfoundation.org)
  • Additional associated anomalies include bicuspid aortic valves, pulmonary atresia or hypoplastic pulmonary artery, subaortic stenosis, coarctation of the aorta, mitral valve prolapse, accessory mitral valve tissue or muscle bands of the left ventricle, ventricular septal defects and pulmonary stenosis. (patient.info)
  • Here, the signal might move back up the accessory pathway, since oftentimes it's bidirectional, meaning the signal can go from atrium to ventricle as well as from ventricle to atrium. (osmosis.org)
  • In classic (or manifest) WPW syndrome, antegrade conduction occurs over both the accessory pathway and the normal conducting system during sinus rhythm. (msdmanuals.com)
  • In Wolff-Parkinson-White syndrome, antegrade conduction occurs over an accessory pathway. (merckmanuals.com)
  • antegrade conduction occurs over the accessory pathway. (merckmanuals.com)
  • In these cases, antegrade accessory pathway conduction occurs, but is not manifest on the surface ECG. (medilib.ir)
  • The AF that does not respond to medicines has several consequences such as maintaining the irregular rhythm (palpitations and discomfort), loss of atrioventricular synchrony, heart failure, and atrial thrombosis with thromboembolic episodes, being the cause of stroke and pulmonary embolism in 33% of the cases [2-4] . (rbccv.org.br)
  • In 1943, the ECG features of preexcitation were correlated with anatomic evidence for the existence of anomalous bundles of conducting tissue that bypassed all or part of the normal atrioventricular (AV) conduction system. (medilib.ir)
  • In atrial fibrillation, antegrade conduction along the accessory pathway may result in rapid ventricular rate, which is poorly tolerated. (mhmedical.com)
  • Alternatively, there might be an accessory , or extra pathway between the atria and the ventricles, like the bundle of Kent in Wolff-Parkinson-White syndrome . (osmosis.org)
  • AF with extremely rapid conduction over the accessory pathway ("pre-excited AF") can lead to syncope and sudden death. (acc.org)
  • Catheter ablation of the accessory pathway should be performed if high-risk features are found on EP testing. (acc.org)
  • Accessory Atrioventricular Bundle" is a descriptor in the National Library of Medicine's controlled vocabulary thesaurus, MeSH (Medical Subject Headings) . (childrensmercy.org)
  • Patients with concealed WPW syndrome are not at risk because in them, antegrade conduction does not occur over the accessory connection. (merckmanuals.com)
  • The mechanism responsible for unidirectional conduction along an accessory pathway (antegrade only or retrograde only) remains undetermined. (medilib.ir)
  • Atrioventricular activation intervals and epicardial conduction velocities were computed using recorded activation times. (nih.gov)
  • Results: Cardiac BPA exposure resulted in prolonged PR segment and decreased epicardial conduction velocity (0.1-100 μM BPA), prolonged action potential duration (1-100 μM BPA), and delayed atrioventricular conduction (10-100 μM BPA). (nih.gov)
  • The additional atrioventricular connection fulfills the anatomic and functional requirements for circus movement or re-entry. (medscape.com)
  • Intravenous digoxin, intravenous amiodarone, intravenous or oral beta- and calcium-channel blockers may lead to extremely rapid conduction over the accessory pathway and hemodynamic compromise in patients with pre-excited AF, and thus, should be avoided. (acc.org)
  • WPW (preexcitation) syndrome is the most common accessory pathway SVT, occurring in about 1 to 3/1000 people. (msdmanuals.com)
  • use AEROCOCCACEAE 2010-2011 MH - Accessory Atrioventricular Bundle UI - D058606 MN - C23.300.190 MS - Extra impulse-conducting tissue in the heart that creates abnormal impulse-conducting connections between HEART ATRIA and HEART VENTRICLES. (nih.gov)
  • PR interval prolongation, towering P waves, and a degree of right bundle branch block are all common electrocardiographic findings. (icloudhospital.com)
  • Because leads are most commonly placed in the right ventricular apex, paced beats will have a left bundle-branch block morphology with inferior axis. (medscape.com)
  • Click THIS LINK for a downloadable pdf of Part 2: Left Bundle Branch Block. (ecgguru.com)
  • Angiodysplasia is associated with muscle weakness abnormal muscle bundles that produce thyroid function tests. (albionfoundation.org)
  • If cardioversion is impossible, medications that prolong the refractory period of the accessory connection should be used. (merckmanuals.com)
  • Wolff-Parkinson-White syndrome (WPW) is the most common form of ventricular pre-excitation due to the presence of an accessory atrioventricular conduction pathway. (logicalimages.com)
  • This accessory pathway(s) characterizes the Wolff-Parkinson-White syndrome. (mhmedical.com)