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Purpose: Electric cardioversion has been successfully used in terminating symptomatic atrial fibrillation (AF). Nevertheless, large-scale study about the acute cardiovascular events following electrical cardioversion of AF is lacking. This study was performed to evaluate the incidence, risk factors, and clinical consequences of acute cardiovascular events following electrical cardioversion of AF. Materials and Methods: The study enrolled 1100 AF patients (mean age 60±11 years) who received cardioversion at four tertiary hospitals. Hospitalizations for stroke/transient ischemic attack, major bleedings, and arrhythmic events during 30 days post electriccardioversion were assessed. Results: The mean duration of anticoagulation before cardioversion was 95.8±51.6 days. The mean International Normalized Ratioat the time of cardioversion was 2.4±0.9. The antiarrhythmic drugs at the time of cardioversion were class I (45%), amiodarone (40%), beta-blocker (53%), calcium-channel blocker (21%), and other medication (11%). The success rate of terminating AF via cardioversion was 87% (n=947). Following cardioversion, 5 strokes and 5 major bleedings occurred. The history of stroke/transient ischemic attack (OR 6.23, 95% CI 1.69–22.90) and heart failure (OR 6.40, 95% CI 1.77–23.14) were among predictors of thromboembolicor bleeding events. Eight patients were hospitalized for bradyarrhythmia. These patients were more likely to have had a lower heart rate prior to the procedure (p=0.045). Consequently, 3 of these patients were implanted with a permanent pacemaker. Conclusion: Cardioversion appears as a safe procedure with a reasonably acceptable cardiovascular event rate. However, to preventthe cardiovascular events, several risk factors should be considered before cardioversion.

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