(A) Intraprocedural fluoroscopic anterior-posterior image. A ring catheter was positioned at the right superior pulmonary vein, and an ablation catheter was positioned near the right pulmonary vein carina. The patient was under mechanical ventilation (the intubation tube is not included in the image) with intra-aortic balloon pump support. (B) An EnSite mapping of the left atrium with ablation lesion tags. The pink, red, and blue points represent the ablation lesions, indicating the measured ablation index. The light-blue points represent the sites where the pulmonary veins were electrically isolated. The left figure is the anteroposterior view and the right figure is the posteroanterior view. ABL, ablation catheter; AP, anteroposterior view; IABP, intra-aortic balloon pump; RA, right atrium; RSPV, right superior pulmonary vein.