EP Lab DigestElectrical Cardioversion for Atrial Fibrillation in the Modern Era

A Spanish cohort study of 243 AF patients undergoing elective cardioversion found 93% acute success but only 40% sinus rhythm maintenance at one year, mirroring outcomes from decades ago. A fortuitously captured patch monitor recording reveals that most patients experience transient arrhythmias post-conversion, not clean sinus restoration.

Clinical Considerations

• Long-term cardioversion success remains low at 40% by one year, reinforcing catheter ablation as the more durable rhythm control strategy.
• Average wait time to cardioversion was 265 days, likely long enough for atrial remodeling to undermine procedural success.
• Amiodarone use predicted sinus rhythm maintenance; surprisingly, left atrial size and delay to cardioversion did not reach significance in this cohort.
• Post-conversion bradycardia and transient arrhythmias are common and expected, not signs of procedural failure.

Practice Applications

• Refer persistent symptomatic AF patients for cardioversion promptly, without waiting for electrophysiology consultation.
• Schedule cardioversion plus TEE as a combined procedure to reduce access delays for anticoagulation-ineligible patients.
• Counsel patients that cardioversion success rates at one year are approximately 40%, setting realistic expectations.
• Consider catheter ablation earlier when cardioversion fails or AF recurs, rather than repeat electrical conversion alone.

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