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Atrial fibrillation stroke prevention — MCCQE Part 1 MCQ

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ModeratePalpitationsAtrial fibrillation stroke preventionMCCQE Part 1

A 68-year-old woman is found to have paroxysmal atrial fibrillation after presenting with palpitations. She has hypertension but no prior bleeding, stroke or valvular disease. Which of the following is the most appropriate long-term stroke prevention strategy?

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Correct answer: BStart 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