Figure 1: Twelve-lead Electrocardiogram with Intracardiac Electrograms from Ablation Catheter (Abl-d and Abl-p) and Arterial Pressure (Press) During Our First Catheter Ablation of Focally Triggered Idiopathic Ventricular Fibrillation.
The first ectopic beat (arrow) is preceded by a sharp deflection from the Purkinje system. Note that the second sinus rhythm beat is followed by the same sharp signal, which is not conducted to the surrounding myocardium. Application at that site abolished ectopy and prevented recurrence of ventricular arrhythmias.