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A 65 y/o M presents to the ED with a 1-day history of an extremely painful R lower extremity. There is no history of trauma. His past medical history includes hypertension and dyslipidemia, as well as a 30 pack-year smoking history. An ECG shows Atrial Fibrillation. He is not on any anticoagulation. On examination you find that the R lower leg is cool and pale. There is altered 2-point discrimination when compared with the other side, and you are unable to palpate a dorsalis pedal pulse. What is the BEST next step?