Regular supraventricular tachycardia with irregular atrial activations

A 19-year-old woman with recurrent supraventricular tachycardia (SVT) occurring after the slow pathway ablation underwent electrophysiological testing. Atrial extrastimulation induced regular SVTs following a sudden prolongation of the AH interval. During the SVT, ventriculoatrial (VA) block occurred with irregular atrial activations. A premature ventricular stimulus delivered during the His refractory period did not reset the following His activation during the SVT. Rapid ventricular pacing terminated the SVT. Therefore, the SVT was diagnosed as atrioventricular nodal re-entrant tachycardia with an upper common pathway. The slow pathway ablation eliminated this SVT.

Source: Europace - January 16, 2017 Category: Cardiology Source Type: research