The “Window” of Slow Pathway Conduction after Ablation and Recurrence of Atrioventricular Nodal Reentrant Tachycardia

Introduction: Slow pathway (SP) conduction often persists following radiofrequency (RF) catheter ablation of atrioventricular nodal reentrant tachycardia (AVNRT). An association between persistent SP conduction, as evidenced by discontinuous AV nodal conduction curves, and recurrent tachycardia has not been established. Of note, the segment of the curve attributable to SP conduction (the “window” of SP conduction) varies. This study examined whether the maximal post-ablation SP conduction window length differs in patients who later have recurrent tachycardia when compared with those who do not recur.