Real-World Outcomes of Cryoballoon vs. Radiofrequency Ablation in Atrial Fibrillation: A Multicenter...

Thermal energy-based catheter ablation techniques, including cryoballoon ablation (CBA) and radiofrequency ablation (RFA), are widely utilized for rhythm control in patients with atrial fibrillation. However, direct comparisons of CBA and RFA using real-world data are limited. This study aims to evaluate the short- and long-term outcomes of CBA and RFA.

A total of 4,868 patients who underwent procedures between January 2018 and July 2022 were selected from the Korean CBA Registry and a multicenter RFA cohort. The primary outcome was the atrial tachyarrhythmia recurrence. To reduce selection bias, 1:1 propensity score matching (PSM) was performed, yielding 1,843 patients in each group.

After PSM, RFA demonstrated significantly lower recurrence rates compared with CBA at both 1 year (20.9% vs. 27.9%; hazard ratio [HR], 0.69; 95% confidence interval [CI], 0.61-0.79) and 3 years (31.9% vs. 35.2%; HR, 0.72; 95% CI, 0.65-0.81). In multivariable Cox regression analysis, RFA was independently associated with lower recurrence risk, with a 30% relative risk reduction at 1 year (HR, 0.70; 95% CI, 0.61-0.80) and a 27% relative risk reduction at 3 years (HR, 0.73; 95% CI, 0.65-0.81). When cavotricuspid isthmus (CTI) ablation was performed in addition to pulmonary vein isolation (PVI), recurrence rates were comparable between RFA and CBA.

In this large, multicenter real-world cohort, RFA consistently demonstrated more favorable short- and long-term outcomes than CBA, even after PSM and multivariable adjustment. However, outcomes were comparable when CTI ablation was additionally performed, underscoring the importance of procedural strategies beyond PVI.