Treatment of Supraventricular Tachycardia Due to Atrioventricular Nodal Reentry by Radiofrequency Catheter Ablation of Slow-Pathway Conduction

ATRIOVENTRICULAR nodal reentrant tachycardia (AVNRT) is the most common form of paroxysmal supraventricular tachycardia. 1 The reentrant circuit contains, as its critical components, a "fast" atrioventricular nodal pathway connecting the atrium to the His bundle and a "slow" pathway with a longer conduction time. In approximately 90 percent of patients, the slow pathway provides the antegrade limb of the circuit and the fast pathway the retrograde limb (the "slow—fast" or common form of AVNRT), but the circuit may be reversed (to the "fast—slow" or uncommon form). The fast pathway is thought to be the normal route of atrioventricular conduction, whereas the . . .