Ablation of Premature Ventricular Contraction with the Help of a Notch

DOI: 10.5935/abc.20140157 A 43-year-o ld male pat ient presented wi th a complaint of palpitation. Electrocardiography revealed premature ventricular contraction (PVC) that appeared to be originating from the left ventricular outflow tract. Tall positive R waves were observed in leads II, III, and aVF, and the R transition was observed at V2 in precordial leads. A notch was realized on the downward deflection of QS, which was only at lead V1. (Figure 1) This finding indicates that the region between the right and left coronary commissures is the origin of VPS. In addition, 24-h Holter monitoring revealed 32000 PVCs. Therefore, an electrophysiology study was planned. During the procedure, the catheter was moved between the right coronary and left coronary commissures, and the ablation catheter was placed at the ventricular side of the commissures where the earliest signal recorded was at 40 ms. At this site, pacing produced 12/12 morphology with PVC. In addition, at this site, we demonstrated a deflection prior to the intracardiac ventricular electrogram of PVCs corresponding to the notch. This deflection was after the intracardiac ventricular electrogram during sinus beats (Figure 1). Ablation was performed at 20 watt 45 degrees, and it terminated all PVCs at this site.