Group 1. PV isolation. Circumferential ablation around the antra of the PV with the aid of electroanatomical mapping (Carto, Biosence-Webster) at a distance of approximately 1-2 cm from the ostia of the left and right PVs (46°C, 35W, 17 mL/min, Stockert, Biosense Webster), aimed at a voltage reduction by > 80% or a peak to peak bipolar electrogram <0.1 mV. End-point of both approaches is verification of PV isolation with demonstration of entry and exit block. The area encircled by circumferential ablation will be calculated using the software provided by the CARTO system.