uk-plab-1 MCQ (SBA): Pulmonary embolism risk factors

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A 29-year-old woman has been taking combined oral contraceptive pills for several years. She smokes 20 cigarettes per day. She presents with sudden-onset pleuritic chest pain and dyspnoea. What combination of risk factors most strongly predisposed her to pulmonary embolism?

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uk-plab-1 MCQ: Pulmonary embolism risk factors — Answer & Explanation