Patient 1 baseline ECG ( A ), intracardiac recordings during successful RF application ( B ), left anterior oblique (LAO) radioscopic projection of the ablation catheter position during successful RF application ( C ), and post-ablation ECG ( D ). ‘RF-on’, start of the RF application; A, local atrial electrogram; V, local ventricular electrogram; V′, far-field ventricular electrogram.