Coronary Artery Disease USMLE Step 1 Practice Question
A 67 year old man develops dizziness and blurred vision when he uses his left arm to carry groceries. Blood pressure in the left arm is lower than in the right. A bruit is heard over the left supraclavicular area. Which of the following is the most likely explanation for his symptoms?
Answer choices
- ARetrograde flow in the vertebral artery due to proximal subclavian stenosisCorrect answer
- BThromboembolism from the left atrial appendage
- CVasospasm of the digital arteries
- DAortic dissection extending into the carotid artery
- ECompression of the brachial plexus in the thoracic outlet
- FOcclusion of the left internal carotid artery with collateral circulation through the external carotid artery
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