title: Successful radiofrequency catheter ablation for macroreentrant ventricular tachycardias in a patient with tetralogy of Fallot after corrective surgery.
abstract: Radiofrequency (RF) catheter ablation was applied to two macroreentrant ventricular tachycardias (VTs) documented after corrective operation for tetralogy of Fallot. The activation wavefront of VT with a right bundle branch block pattern was found to revolve in a clockwise manner around a presumed myotomy scar in the right ventricle, and VT with a left bundle branch block pattern revolved around the same anatomical obstacle in a counterclockwise manner. In both VTs, the biggest conduction delay was confirmed at the right ventricular outflow tract. RF applications to the slow conduction area terminated each VT within a few seconds but were insufficient to cure the VTs. RF lesions were then applied to the slow conduction area in a line to intersect the macroreentrant circuit, and both VTs became noninducible.
mesh_terms: D000293:Adolescent; D002037:Bundle-Branch Block / Q000503:physiopathology; D017115:Catheter Ablation; D002921:Cicatrix / Q000503:physiopathology; D004562:Electrocardiography; D006352:Heart Ventricles / Q000503:physiopathology / Q000601:surgery; D006801:Humans; D008297:Male; D011183:Postoperative Complications / Q000601:surgery*; D011664:Pulmonary Valve / Q000503:physiopathology; D017180:Tachycardia, Ventricular / Q000503:physiopathology / Q000601:surgery*; D013771:Tetralogy of Fallot / Q000601:surgery*