Role of the His bundle in verapamil-sensitive idiopathic left ventricular tachycardia

Most cases of verapamil-sensitive idiopathic left ventricular tachycardia (ILVT) with right bundle branch block and superior axis pattern have been reported as a reentrant circuit with slow conduction to the left posterior fascicle through the septal Purkinje fiber.1–4 However, the exact anatomic structure of the reentrant circuit, particularly upper turnaround, has not been fully elucidated.