An unusual response of pulmonary vein bigeminy to antral ablation.

A 70-year-old-male patient underwent cryoballoon pulmonary vein (PV) isolation to treat drug-resistant paroxysmal atrial fibrillation (AF). As ablation continued, electrical isolation of the LLPV was achieved as evidenced by non-conducted sinus beat inside the LLPV and subsequent atrium-PV dissociation and exit block was confirmed with pacing from inside the LLPV. Of note, PV bigeminy recurred with the same PVP1-PVP2 interval after LLPV isolation (Fig. [Extracted from the article]