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 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)
This can lead to an Atrioventricular reentrant tachycardia which may pass anterogradely or retrogradely through the AV node and accessory pathway. (abcmedicalnotes.com)
Conduction8
However, in rapid atrial tachycardias with variable atrioventricular (AV) conduction and in MAT, the pulse may be irregular. (medscape.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)
The assembly includes a circumferential ablation element which is adapted to ablate a circumferential region of tissue along a pulmonary vein wall which circumscribes the pulmonary vein lumen, thereby transecting the electrical conductivity of the pulmonary vein against conduction along its longitudinal axis and into the left atrium. (justia.com)
More specifically, it is a circumferential ablation device assembly which is adapted to ablate a selected circumferential region of tissue along a pulmonary vein wall and thereby form a circumferential conduction block against conduction along the longitudinal axis of the pulmonary vein wall. (justia.com)
This is an elegantly simple illustration of normal conduction compared to accessory pathway conduction, as seen in Wolff-Parkinson-White conduction. (ecgguru.com)
An accessory pathway, along with the normal pathway through the AV node, can form a functional circuit, allowing conduction to proceed down one pathway and return up the other, in a rapidly repeating circular motion. (ecgguru.com)
Conduction through the accessory pathway can be forward (anterograde) or backward (retrograde). (ecgguru.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)
Atrial1
People with W-P-W have one or more accessory pathways which allow atrial impulses to bypass the AV node and "pre-excite" the ventricles. (ecgguru.com)
Pathway8
Secondly, when an accessory pathway is present, it helps to localise the position of the pathway within the heart. (simpleeducation.co)
The impulse conducts forward through the AV node, and backward over the accessory pathway. (ecgguru.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)
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)
Right axis devi2
The typical ECG changes in tetralogy of Fallot are right axis deviation, large R waves in the anterior precordial leads and large S waves in the lateral precordial leads. (bvsalud.org)
Finally, when the patient has RBBB, if a left axis or a right axis deviation is present, this represents abnormality of both bundle branches and may precede complete heart block or asystole in the future. (simpleeducation.co)
Pathways1
Wolff-Parkinson-White (WPW) syndrome Reentrant supraventricular tachycardias (SVT) involve reentrant pathways with a component above the bifurcation of the His bundle. (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)
Atria1
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)
Abnormal2
An abnormal cardiac axis may help one to conclude that this is VT rather an SVT. (simpleeducation.co)
An abnormal twisting or rotation of a bodily part or member on its axis. (bvsalud.org)
Narrow1
The equatorial band has a length relative to the longitudinal axis of the expandable member that is narrow relative to the working length, and is also substantially shorter than its circumference when the working length is in the radially expanded position. (justia.com)
An easy way of establishing axis is to look at lead I, II and III. (simpleeducation.co)
Concerns regarding the technical challenges and long-term lead parameters of His Bundle Pacing (HBP) have been overcome to many extents with the development of Left Bundle Branch Area Pacing (LBBAP), and both techniques are likely to play an important role in pediatric and CHD pacing in the future. (stanfordchildrens.org)
Irregular1
[ 2 , 3 ] VT refers to any rhythm faster than 100 (or 120) beats/min, with three or more irregular beats in a row, arising distal to the bundle of His. (medscape.com)
Conduction7
OBJECTIVE: The purpose of this study was to investigate the differences in the atrioventricular conduction axis and adjacent structures between dogs and humans. (bvsalud.org)
METHODS: We prepared 33 human and 5 canine hearts for serial histologic sections of the atrioventricular conduction axis, making correlations with gross anatomic findings. (bvsalud.org)
This correlated with an extensive nonbranching component of the ventricular conduction axis, which skirted half of the noncoronary aortic sinus. (bvsalud.org)
When this recess is absent, as in the canine heart and in some human hearts, a greater proportion of the atrioventricular conduction axis is found within the circumference of the subaortic outflow tract. (bvsalud.org)
The importance of this study is to identify the morphological variations of the components of atrioventricular zone that affect the conduction system and its clinical relationship in different species of mammals. (bvsalud.org)
An accessory pathway, along with the normal pathway through the AV node, can form a functional circuit, allowing conduction to proceed down one pathway and return up the other, in a rapidly repeating circular motion. (ecgguru.com)
Conduction through the accessory pathway can be forward (anterograde) or backward (retrograde). (ecgguru.com)
Tachycardia2
Atrioventricular Nodal Reentrant Tachycardia is a type of supraventricular tachycardia (ie it originates above the level of the Bundle of His) and is the commonest cause of palpitations in patients with hearts exhibiting no structurally abnormality. (crashingpatient.com)
A circular pathway can form between the normal AV pathways and the accessory pathway, causing an impulse to depolarize the ventricles and return to the atria in a rapidly repeating cycle, causing a paroxysmal supraventricular tachycardia. (ecgguru.com)
Node5
Atrioventricular node is responsible for delaying the passage of the electrical impulse to ventricles in order to protect them from fast depolarizations coming from the atria. (bvsalud.org)
We observed both an increase in collagen fibers and a decrease in the size of P cells (nodal pacemaker cells) within the atrioventricular node in dogs, horses and pigs in cases that presented cartilage in fibrous body. (bvsalud.org)
The percentage of fundamental substance in atrioventricular node was significantly higher in dogs and the percentage of collagen fibers was higher in pigs, both than in humans. (bvsalud.org)
The impulse conducts forward through the AV node, and backward over the accessory pathway. (ecgguru.com)
Tachyarrhythmias can also form when impulses from atrial flutter or atrial fibrillation rapidly enter the ventricles through the accessory pathway without the filtering effect of the AV node. (ecgguru.com)
RBBB1
RBBB + LAHB), left axis deviation (LAD) at -57 degrees. (ecgguru.com)
Rhythm1
[ 2 , 3 ] VT refers to any rhythm faster than 100 (or 120) beats/min, with three or more irregular beats in a row, arising distal to the bundle of His. (medscape.com)
Normal1
The delta wave is seen in normal sinus rates when the accessory pathway conducts anterograde, pre-exciting the ventricles. (ecgguru.com)
Left1
Wolff-Parkinson-White syndrome is caused by an accessory pathway called the Bundle of Kent, which can occur on either the left or the right side of the heart. (ecgguru.com)