AVRT in WPW can be classified into: Orthodromic (most common): the antegrade electrical signal moves from the atria to the ventricles through the AV node, whereas the retrograde electrical signal moves from the ventricles to the atria through the accessory pathway.
Is WPW an accessory pathway?
Patients with WPW syndrome have an extra electrical pathway between the atria and the ventricles, known as an accessory pathway. This abnormal pathway directly connects the atria and ventricles at a site other than the AV node. It can be considered a small gap in the insulation between the atria and ventricles.
What is the name of the accessory pathway in WPW?
Individuals with WPW have an accessory pathway that communicates between the atria and the ventricles, in addition to the AV node. This accessory pathway is known as the bundle of Kent.
What is antegrade conduction?
1. forward conduction of impulses through a nerve. 2. in the heart, conduction of impulses from atria to ventricles.
What is antegrade conduction of an accessory pathway?
Accessory pathways are microscopic muscular bundles that connect the atrium and ventricle, providing a “bypass” of the normal conduction system. Manifest pathways, those capable of antegrade conduction, are present in the Wolff-Parkinson-White (WPW) syndrome.
What is the accessory conduction pathway?
An accessory pathway is an aberrant cardiac muscle bundle that often is capable of rapid conduction and that connects the atrium to the ventricle, usually at the atrioventricular (AV) annulus. Accessory pathways are a consequence of incomplete embryologic development of the AV annulus and sometimes may be genetic.
What is accessory pathway ablation?
Accessory pathways are muscular connections that bridge atrio-ventricular (A-V) rings. For patients with symptomatic WPW syndrome catheter ablation has become the treatment of choice. These pathways occasionally insert in the epicardial aspect of the A-V rings or along the coronary venous musculature.
Is WPW regular or irregular?
Abnormal electrical system in WPW The most common arrhythmia associated with WPW syndrome is called paroxysmal supraventricular tachycardia. Some people with WPW syndrome have a type of irregular heartbeat known as atrial fibrillation.
Is Wolff Parkinson White AVRT or avnrt?
Atrioventricular nodal reentrant tachycardia (AVNRT) is a narrow complex tachycardia characterized by the presence of dual electrical pathways near or in the AV node. In contrast, Wolff-Parkinson-White (WPW) pattern is diagnosed by the presence of short PR interval, delta waves, and widened QRS complex.
How is WPW different from SVT?
What is SVT? Supraventricular tachycardia (SVT) refers to a group of abnormal fast heart rhythms that arise because of a problem involving the upper chambers of the heart. WPW is short for Wolf-Parkinson White syndrome which is a special form of SVT.
Where does antegrade conduction occur in Wolff-Parkinson-White (WPW) syndrome?
In manifest Wolff-Parkinson-White (WPW) syndrome, antegrade conduction occurs over the accessory pathway.
What are accessory pathways in Wolff-Parkinson-White syndrome?
Accessory pathways are microscopic muscular bundles that connect the atrium and ventricle, providing a “bypass” of the normal conduction system. Manifest pathways, those capable of antegrade conduction, are present in the Wolff-Parkinson-White (WPW) syndrome.
What is the target for ablation in accessory pathway-mediated reentry?
The target for ablation in accessory pathway-mediated reentry is the accessory pathway itself ( Fig. 20-2 ). The AV node is another vulnerable site, but its ablation may ultimately necessitate pacemaker therapy if antegrade bypass tract conduction fails, a phenomenon that can occur in up to 20% of patients.
What is the concealed accessory pathway in ECG?
When conduction from atria to ventricles across the accessory pathway does not occur (so-called concealed accessory pathway), the resting ECG does not demonstrate preexcitation. Patients with accessory pathways are at risk for paroxysmal supraventricular tachycardias.
