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A 72-year-old man presents to A&E department due to sudden onset pain left foot since 6am with no history of trauma. Paracetamol and ibuprofen have not improved pain and they are unable to walk. The foot is cold to touch and pale compared to the right. Capillary refill time is delayed at 4s. There is a palpable femoral pulse but nothing distal to that. Motor function are intact but light touch sensation is reduced on dorsum of the left foot. Which would be the most appropriate investigation to order?
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