Figure 11c

Ostial ablation at three arrhythmogenic pulmonary veins (PVs). Radiofrequency (RF) applications eliminated all evidence of sharp PV electrical activity, as shown in the corresponding elecrgrams before and after ablation from the same sites. Note that the electrgrams of both left PVs are shown during distal coronary sinus pacing (s= pacing stimulus), which separate and highlights the PV potential (pvp). a= atrial optential; LIPV = left pulmonary vein;
RSPV = right superior vein; v =ventricular potential.

Reference:Haissaguerre , M. and others,Catheter ablation of chronic atrial fibrillation targeting the reinitiating triggers,J.Cardiovasc. Electrophysiol.2000;1112-10).