AV nodal reentrant tachycardia
AV nodal reentrant tachycardia (AVNRT) is a type of reentrant tachycardia (fast rhythm) of the heart. It is a supraventricular tachycardia, meaning that it involves the atria (upper chambers) of the heart.
In AVNRT, the fast pathway and the slow pathway are both in the AV node.
Types of AVNRT
There are two types of AVNRT, called the common form and the uncommon form.
In common AVNRT, the anterograde conduction is via the slow pathway and the retrograde conduction is via the fast pathway.
In uncommon AVNRT, the anterograde conduction is via the fast pathway and the retrograde conduction is via the slow pathway.
Treatment
An episode of SVT due to AVNRT can be terminated by any action that transiently blocks the AV node.