Atrial flutter: before cardiac ablation or pharmacologic or electrical conversion, what is recommended due to clot risk?

• A. Antibiotics
• B. Immediate cardioversion without anticoagulation
• C. Antiplatelet therapy only
• D. Anticoagulation

Answer: (D)

In atrial flutter, blood can pool in the atria and form thrombi because the atrial contractions are ineffective. If you move to rhythm control with ablation or electrical or pharmacologic conversion, a formed clot can be dislodged and travel to the brain, causing a stroke or systemic embolism. Because of this embolic risk, anticoagulation is recommended before attempting rhythm control.

Therapeutic anticoagulation—using a DOAC or warfarin with appropriate INR targets—is typically given for at least about three weeks before cardioversion or ablation if the flutter has been present for more than 48 hours or its duration is unknown. If the duration is uncertain or the clot risk is high, a transesophageal echocardiogram can be done to exclude a thrombus; if none is found, the procedure can proceed with ongoing anticoagulation. After successful rhythm restoration, continuing anticoagulation for several weeks helps prevent thromboembolism while the atria recover and regain function.

Antibiotics are not indicated for this issue, and antiplatelet therapy alone does not provide sufficient protection against stroke risk from atrial thrombi.