The endoscopic laser balloon ablation system affords a unique view of the beating heart for visual guidance in pulmonary vein (PV) isolation. A 66-year-old patient was admitted for catheter ablation of atrial fibrillation (AF). While encircling the left superior PV, AF terminated into sinus rhythm, which was diagnosed by observing sudden regularization of previously rapidly fibrillating atrial tissue demonstrating the unique endoscopic video function.