Optimal timing for cardioversion in patients with atrial fibrillation

Area of Science:

• Cardiology
• Electrophysiology
• Internal Medicine

Background:

• Electrical cardioversion (CV) is a cornerstone of atrial fibrillation (AF) rhythm management.
• The optimal timing for performing CV in AF patients remains inadequately defined.
• Current guidelines lack specific recommendations regarding the ideal time window for CV initiation.

Purpose of the Study:

• To investigate the association between the duration of AF episodes and the safety and efficacy of electrical CV.
• To identify the optimal time interval for CV to minimize adverse events and maximize success rates.
• To evaluate the impact of AF duration on composite adverse outcomes, including procedural success, complications, and recurrence.

Main Methods:

• A multicenter, multicohort study analyzed 4356 electrical CV procedures in 2530 patients on oral anticoagulation.
• Patients were stratified into four groups based on AF episode duration: <24 hours, 24-48 hours, 48 hours-30 days, and >30 days.
• The composite adverse outcome included unsuccessful CV, arrhythmic complications, thromboembolic events, mortality, and AF recurrence within 30 days.

Main Results:

• CV success rates varied by AF duration, with the lowest failure rate observed between 24-48 hours (5.4%).
• Thromboembolic events and mortality were infrequent and comparable across all groups.
• AF recurrence rates were highest in the 48 hours-30 days group (37.3%).
• AF episodes >48 hours were identified as an independent predictor of composite adverse outcomes (OR: 1.49).

Conclusions:

• The optimal timing for electrical CV in AF exhibits a J-shaped curve, with the lowest risk of adverse outcomes occurring 24 to 48 hours after AF onset.
• Delaying CV beyond 48 hours in patients managed with a rhythm-control strategy is associated with a significantly increased risk of adverse events.
• These findings suggest a specific time window for CV to balance efficacy and safety in AF management.