Effectiveness and safety of atrial fibrillation ablation in females.

BACKGROUND: Existing data on the effectiveness and safety of atrial fibrillation (AF) ablation in females are limited to studies of small sample size, lacking longer-term follow-up or adjustment for potential confounders. METHODS: A total of 6421 patients (2072 females) undergoing a first AF ablation procedure after enrollment in the Chinese Atrial Fibrillation Registry (China-AF) study between August 2011 and December 2017 were analyzed. We evaluated the effectiveness [recurrence of documented (symptomatic or not) atrial tachyarrhythmia (AT)] and the safety (incidence of procedure-related complications) of AF ablation in female patients, compared to male patients. Sensitivity analyses based on routine Holter data were also utilized to avoid potential sex differences in reporting of AF symptoms. RESULTS: Females were about 5 years older than males at the time of ablation (mean age 63.4 +/- 9.5 vs. 58.3 +/- 10.8, P < 0.0001). A higher proportion of female patients had paroxysmal AF (74.3% vs. 56.7%, P < 0.0001), hypertension (69.7% vs. 61.3%, P < 0.0001) and hyperlipidemia (57.2% vs. 52.9%, P = 0.001). Female sex was found to be an independent risk factor of AT recurrence in multivariate analyses (aHR 1.26, 95% CI 1.15 - 1.38, P < 0.0001). These findings were confirmed in sensitivity analyses using only Holter data. Female sex was also associated with a higher risk of periprocedural complications after adjustment for baseline variables (aHR 1.41, 95% CI 1.03 - 1.94, P = 0.03). CONCLUSIONS: Female sex is an independent risk factor of AT recurrence and periprocedural complications after AF ablation. This article is protected by copyright. All rights reserved.