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New AF Post-Cardioversion Anticoagulation — RACP Adult Medicine MCQ

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ModerateCardiologyNew AF Post-Cardioversion AnticoagulationRACP Adult Medicine

A 55-year-old man with no cardiac history develops palpitations. ECG shows an irregularly irregular narrow complex tachycardia at a rate of 135 bpm with absence of P waves and fibrillatory baseline. This is his first presentation. Echocardiography shows a structurally normal heart and normal thyroid function. How long should anticoagulation be considered after cardioversion?

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Correct answer: D — 4 weeks post-cardioversion

For new-onset AF of <48 hours duration being cardioverted, and in patients with unknown duration of AF, anticoagulation for at least 4 weeks post-cardioversion is recommended to cover the period of atrial stunning (which carries thromboembolic risk even after restoration of sinus rhythm). Pre-cardioversion anticoagulation or TOE to exclude left atrial thrombus is required if AF duration is >48 hours or unknown. Long-term anticoagulation post-cardioversion is guided by CHA₂DS₂-VA score rather than maintenance of sinus rhythm.

Reference: NHF/CSANZ – 2018 – AF Guidelines; ESC – 2024 – AF Guidelines