Atrial fibrillation stroke prevention — MCCQE Part 1 MCQ
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Correct answer: B — Start an oral anticoagulant after shared decision-making and bleeding-risk review
Canadian guidance uses stroke-risk assessment for all AF patterns; age 65 or older meets CHADS-65 criteria for oral anticoagulation unless contraindicated. Aspirin is not an adequate substitute for stroke prevention in AF, and paroxysmal AF still carries embolic risk. Bleeding risk should be mitigated but should not automatically preclude anticoagulation.
Reference: CCS Atrial Fibrillation Guidelines; Thrombosis Canada AF guidance