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Cardioversion Threshold 24 Hours — EECC MCQ

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EasyArrhythmia & ElectrophysiologyCardioversion Threshold 24 HoursEECC

A 65-year-old man with persistent AF arrives in the emergency department. He is haemodynamically stable with a ventricular rate of 110 bpm. The AF onset was estimated at 20 hours ago. According to the 2024 ESC AF Guidelines, can cardioversion be performed without prior TOE?

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Correct answer: E — Yes — cardioversion can be performed without prior TOE if AF duration is ≤24 hours and the patient has been appropriately anticoagulated or is at low stroke risk; the threshold has been reduced from 48 hours in previous guidelines

The 2024 ESC AF Guidelines reduced the safe cardioversion threshold from 48 hours (2020 guidelines) to 24 hours of AF duration. If AF duration is ≤24 hours, cardioversion (electrical or pharmacological) can be performed without prior TOE in patients who are appropriately anticoagulated or at low stroke risk. If AF duration is >24 hours or unknown, either 3 weeks of therapeutic anticoagulation or TOE to exclude LA/LAA thrombus is required before cardioversion. Post-cardioversion anticoagulation (≥4 weeks) is recommended regardless of CHA₂DS₂-VA score to cover the period of atrial stunning. Long-term OAC decisions are based on the CHA₂DS₂-VA score.

Reference: ESC (2024): Guidelines for the Management of Atrial Fibrillation