Atrioventricular Reciprocating Tachycardia Mediated by Twin Atrioventricular Nodes

A 21-year-old man with univentricular and uniatrial heart came for a third attempt at ablation of recurrent supraventricular tachycardia. He had undergone a previous cardiac surgery of a Blalock–Taussig shunt, and bidirectional Glenn, and the electrophysiological study revealed an atrioventricular