A relation between ablation area and outcome of ablation using 28-mm cryoballon ablation: Importance of carina region.

Abstract

Pulmonary vein isolation (PVI) with wide antral ablation leads to better outcomes in atrial fibrillation ablation therapy, but the ablation area is relatively small during cryoballoon ablation (CBA). The present study tested the hypothesis that wide ablation can lead to better outcomes in CBA. Ninety-six patients with atrial fibrillation were enrolled (paroxysmal 76%, 64.1 ± 11.7 years). All patients underwent preprocedural computed tomography and the PV diameter at left atrial PV junction was measured. PV isolation was performed using a 28-mm CB for 3 minutes with single freezing. Sinus rhythm bipolar voltage amplitude maps with the NavX mapping system were generated after ablation. According to the voltage map, patients were divided into 3 subgroups (68 in the extensive isolation group, 17 in the individual isolation group, and 10 in the incomplete isolation group). Atrial tachyarrhythmias recurred in 9 patients of the extensive isolation group and 6 in the individual isolation group. The rate of 12-month freedom from tachyarrhythmia after a single ablation procedure was 84% (95% confidence interval [C.I.], 72%-91%) in the extensive group and 57% (95% C.I., 28%-78%) in the individual group (P=0.048). Multiple logistic regression analyses revealed that maximal PV diameter was the only predictor to achieve extensive PVI (odds ratio, 1.57; 95% C.I. 1.08-2.29 P=0.018). Extensive isolation is superior to individual isolation for achieving freedom from atrial arrhythmia in long term follow-up by CBA. Evaluating PV diameter at the left atrial PV junction is essential for applying CBA.