Population-Based Evaluation of Major Adverse Events After Catheter Ablation for Atrial Fibrillation.

Objectives: The purpose of this study was to evaluate the safety and incidence of periprocedural adverse events (AEs) among patients who underwent catheter ablation (CA) for atrial fibrillation (AF) in Quebec and Ontario, Canada.

Background: CA is evolving into the mainstay therapy for patients with symptomatic AF refractory to antiarrhythmic medication. However, the safety of CA at the population level over time requires further evaluation.

Methods: A population-based cohort was constructed using administrative databases of all patients who underwent CA between 1999 and 2014 in Quebec and Ontario, Canada. Incidence and predictors of AEs were assessed within 30 days of CA. Major AEs included all-cause mortality, cerebrovascular accident (CVA) including transient ischemic attack, pericardial effusion requiring drainage (PERD), vascular AEs, hemorrhage/hematoma, and pulmonary embolism.

Results: Of 6,388 patients who had a CA (mean age 57.3 years; mean CHADS-VASc 1.1 ± 1.4; 27.6% female), 221 (3.5%) patients developed major AEs within 30 days of index CA. Hemorrhage/hematoma was the most frequent (1.4%), followed by PERD (1.0%) and CVA (0.6%). PERD was more likely to occur post-discharge than during the index CA (p < 0.05). CVA decreased by more than 50% in patients with recent compared with remote CA (p < 0.05). Compared with index CA, the incidence of PERD and hemorrhage/hematoma was greater at first repeat CA (p < 0.05 for both).

Conclusions: CA is a relatively safe procedure with low incidence of major AEs. The incidence of procedure-related CVA appeared to decline significantly over time. Incidence of PERD remained relatively stable and was more likely to be diagnosed after discharge and following repeat CA.