Entrance Site of the Slow Conduction Zone of Verapamil-Sensitive Idiopathic Left Ventricular Tachycardia: Evidence Supporting Macroreentry in the Purkinje System

Entrance Site in ILVT. The entrance site of the slow conduction zone was identified by entrainment study in an 18 year-old woman with verapamil- sensitive idiopathic left ventricular tachycardia, Radiofrequency catheter ablation at this site eliminated the tachycardia. The entrance site was at a mid-septal location and was more than 2 cm away from the exit site. Electrophysiologic findings suggested macroreentry in the Purkinje system as the mechanism of idiopathic left ventricular tachycardia