Radiofrequency ablation of incessant ventricular tachycardia to prevent multiple defibrillator shocks.

In a patient who received frequent shocks from an implantable defibrillator, a slow ventricular tachycardia originating in a large left ventricular aneurysm was ablated with radiofrequency current. Pacemapping perfectly matched the spontaneous, incessant arrhythmia. Local entrainment was present, along with a mid-diastolic potential of 65 microV. Application of 30 W terminated tachycardia within 12 s. He had no more recurrences during follow-up.