Accessory Atrioventricular Bundle
Bundle of His
Atrioventricular Node
Heart Conduction System
Accessory Nerve
Lown-Ganong-Levine Syndrome
Encyclopedias as Topic
Wolff-Parkinson-White Syndrome
Electrocardiography
Differences in accessory pathway location by sex and race. (1/29)
(+info)Should sevoflurane be used in the electrophysiology assessment of accessory pathways? (2/29)
(+info)Atrial asystole during ventricular pacing following radiofrequency catheter ablation of accessory pathways. (3/29)
(+info)A case for ambidextrous doctors. (4/29)
(+info)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)
(+info)Isoproterenol administration during general anesthesia for the evaluation of children with ventricular preexcitation. (7/29)
(+info)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.
Lown-Ganong-Levine syndrome
Accessory pathway
Wolff-Parkinson-White syndrome
Supraventricular tachycardia
Cardiac skeleton
Ebstein's anomaly
Third-degree atrioventricular block
Pre-excitation syndrome
Atrial flutter
AV nodal reentrant tachycardia
Index of anatomy articles
Systole
Tachycardia
Mitral valve
Cardiac conduction system
Heart
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Atrial Tachycardia Clinical Presentation: History, Physical Examination
Tachycardia15
- 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)
- 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)
- Accessory pathway reentrant tachycardia involves tracts of conducting tissue that partially or totally bypass normal AV connections (bypass tracts). (msdmanuals.com)
- OBJECTIVE To assess the efficacy and safety of intravenous dofetilide in preventing induction of atrioventricular re-entrant tachycardia. (bmj.com)
- Fifty one patients with electrically inducible atrioventricular re-entrant tachycardia were allocated to one of five doses of dofetilide (1.5, 3, 6, 9, and 15 μg/kg), two thirds of the dofetilide dose being given over a 15 minute loading period and the remainder over a 45 minute maintenance period. (bmj.com)
- MAIN OUTCOME MEASURE Responders were defined as patients in whom dofetilide prevented reinduction of atrioventricular re-entrant tachycardia at the end of the infusion. (bmj.com)
- In non-responders, dofetilide increased the cycle length of induced atrioventricular re-entrant tachycardia. (bmj.com)
- CONCLUSIONS Dofetilide shows promise as an agent for the prevention of atrioventricular re-entrant tachycardia in patients without structural heart disease. (bmj.com)
- Atrioventricular re-entrant tachycardia is currently treated with various pharmacological agents. (bmj.com)
- 14-16 However, to date there have been no studies on the dose dependent effects of dofetilide on atrioventricular re-entrant tachycardia. (bmj.com)
- Our goal in this study was to assess the efficacy of intravenous dofetilide, in five different dosing regimens, for treating patients with inducible atrioventricular re-entrant tachycardia, by determining its ability to prevent reinduction of the tachycardia. (bmj.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)
Pathway27
- 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)
- 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)
- 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)
- Dofetilide increased the atrial and ventricular effective refractory periods, as well as the antegrade and retrograde effective refractory period of the accessory pathway. (bmj.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)
Node13
- 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)
- Because of its selective class III antiarrhythmic effect, dofetilide has no effect on atrioventricular conduction or sinus node function. (bmj.com)
- 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)
Nodal conduction1
- 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)
Bypass1
- 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)
Pathways1
- Reentrant supraventricular tachycardias (SVT) involve reentrant pathways with a component above the bifurcation of the His bundle. (msdmanuals.com)
Branch2
- 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)
Valves2
- 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)
Branches1
- Identify the letter that indicates the location of the bundle branches. (easynotecards.com)
Ventricles1
- 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)
Bifurcation1
- They originate above the bifurcation of the bundle of His. (rjmatthewsmd.com)
Tissue1
- 240 bpm in cats) and require atrial or atrioventricular junctional tissue for its initiation and maintenance. (vin.com)
Left2
- 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)
AVRT1
- Supraventricular atrioventricular (AVRT) or nodal (AVNRT) reciprocating tachycardias are common in patients with CHD. (ecrjournal.com)
Pathways8
- 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)
- Reentrant supraventricular tachycardias (SVT) involve reentrant pathways with a component above the bifurcation of the His bundle. (msdmanuals.com)
- 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. (lookformedical.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)
Posterior2
- 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)
Ventricle3
- It is generated within the ventricle below the BUNDLE OF HIS, either as autonomic impulse formation or reentrant impulse conduction. (lookformedical.com)
- 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)
Intraventricular conduction1
- Development of atrioventricular and intraventricular conduction disturbances in patients undergoing transcatheter aortic valve replacement with new generation self-expanding valves: A real world multicenter analysis. (bostonscientific.com)
Refractory2
- If cardioversion is impossible, medications that prolong the refractory period of the accessory connection should be used. (merckmanuals.com)
- In patients with atrial fibrillation and atrial flutter, use propafenone ER capsules with drugs that increase the atrioventricular nodal refractory period. (nih.gov)
Atria6
- 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. (lookformedical.com)
- During fetal life, numerous connections link the atria to the ventricles, but they all disappear before birth except for the bundle of His. (mhmedical.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)
- The accessory pathway (called Bundle of Kent) may also transmit electrical impulses abnormally from the ventricles back to the atria. (cardiachealth.org)
- Except for the AV bundle, which provides the only electrical connection, the atria are electrically insulated from the ventricles. (cliffsnotes.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)
Conduction occurs4
- 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)
Anomalous1
- 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)
Ventricular rate1
- In atrial fibrillation, antegrade conduction along the accessory pathway may result in rapid ventricular rate, which is poorly tolerated. (mhmedical.com)
Palpitations1
- 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)
Syncope1
- AF with extremely rapid conduction over the accessory pathway ("pre-excited AF") can lead to syncope and sudden death. (acc.org)
Abnormal muscle2
- While they knew what caused the arrhythmia, finding the exact location of the abnormal muscle bundle in Rex's body was challenging. (ithacavoice.org)
- Angiodysplasia is associated with muscle weakness abnormal muscle bundles that produce thyroid function tests. (albionfoundation.org)
Catheter Ablation1
- Catheter ablation of the accessory pathway should be performed if high-risk features are found on EP testing. (acc.org)
Descriptor1
- Accessory Atrioventricular Bundle" is a descriptor in the National Library of Medicine's controlled vocabulary thesaurus, MeSH (Medical Subject Headings) . (childrensmercy.org)
Antegrade2
- 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)
Patients1
- 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)
Epicardial2
- 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)
Anatomic1
- The additional atrioventricular connection fulfills the anatomic and functional requirements for circus movement or re-entry. (medscape.com)
Preexcitation1
- WPW (preexcitation) syndrome is the most common accessory pathway SVT, occurring in about 1 to 3/1000 people. (msdmanuals.com)
Aberrant1
- 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)