Figure 1.

Induction of dual tachycardia by electrical shock. Telemetry from the implantable cardioverter-defibrillator shows noise on both atrial and ventricular channels resulting from a 60 Hz electrical shock. The duration of the electrical shock is in excess of 10 seconds, which results in the induction of both atrial fibrillation and ventricular fibrillation. AN = atrial rate noise; AP = atrial pace; AP-Ns = atrial pace noise; AS = atrial sense; ATR = atrial tachycardia sense; VN = ventricular rate noise; VP = ventricular pace; VP-Ns = ventricular pace noise; VS = ventricular sense.