What is Antidromic tachycardia?

What is Antidromic tachycardia?

Antidromic AVRT is a wide QRS complex (fully preexcited) tachycardia. In the presence of atrial tachycardia, atrial flutter, AF, or AVNRT, the QRS complexes can also be preexcited when the AP acts as a bystander and is not a critical part of the reentry circuit.

Is WPW Orthodromic or Antidromic?

Only about 5% of the tachycardias in patients who have WPW syndrome are antidromic tachycardias; the remaining 95% are orthodromic.

What is the difference between AVRT and WPW?

How Is WPW Different From Typical AVRT? The difference between this typical AVRT and the AVRT seen with WPW is that, in WPW, the accessory pathway is capable of conducting electrical impulses in both directions — from the atrium to the ventricle as well as from the ventricle to the atrium.

Is Wolff-Parkinson-White AVRT or AVNRT?

Background: Atrioventricular nodal reentrant tachycardia (AVNRT) is the most common form of supraventricular tachycardia. In contrast, Wolff-Parkinson-White (WPW) pattern consists of an accessory pathway, which may result in the development of ventricular arrhythmias.

Is AVRT a WPW?

Topic Overview. Wolff-Parkinson-White (WPW) syndrome is a heart rhythm problem that causes a very fast heart rate. WPW is one type of supraventricular tachycardia called atrioventricular reciprocating tachycardia (AVRT).

What does AVRT look like on ECG?

ECG features of AVRT with orthodromic conduction: Rate usually 200-300 bpm. Retrograde P waves are usually visible, with a long RP interval. QRS < 120ms unless pre-existing bundle branch block, or rate-related aberrant conduction.

What causes orthodromic AVRT?

Orthodromic AVRT represent approximately 95% of all cases of AVRT and it arises when a premature atrial beat encounters a refractory accessory pathway but excitable atrioventricular node.

What is antantidromic AVRT and how is it induced?

Antidromic AVRT, ie, tachycardia that uses the accessory pathway for antegrade conduction and the AV node for retrograde conduction, may be induced in approximately 6% of patients with accessory pathways located in the left or right free wall or the anterior septum at an adequate distance from the AV node.

What is orthodromic atrioventricular rhythm (AVRT)?

Orthodromic AVRT represent approximately 95% of all cases of AVRT and it arises when a premature atrial beat encounters a refractory accessory pathway but excitable atrioventricular node. The impulse will then propagate normally through the His-Purkinje system, depolarize the ventricles and circulate back to the atria via the accessory pathway.

What is atrioventricular reentrant tachycardia (AVRT)?

Individuals with accessory pathways are at risk of developing atrioventricular reentrant tachycardia (AVRT). This is a rapid tachyarrhythmia in which a macroscopic re-entry circuit which involves the atria, atrioventricular node, accessory pathway and the ventricles. In most cases the re-entry is induced by a premature atrial beat.

What causes anterograde conduction to occur in AVRT?

In orthodromic AVRT, anterograde conduction occurs via the AV node, resulting in a normal direction of ventricular depolarisation. This can occur in patients with a concealed pathway (AP that conducts retrograde only, not evident on sinus rhythm ECG). Retrograde P waves are usually visible, with a long RP interval