Q. A 70-year-old male is brought to the emergency department. The patient has been experiencing pain in his left leg for the past 4 hours. The pain began as an insidious onset while he was sitting on the sofa watching television. The patient states that his leg feels numb now. He further states that this is his first time experiencing such symptoms. The patient denies any trauma, fever, chills or insect bite. Approximately 2 months ago, he had an myocardial infarction, which led to hospital admission. Medical records show that he was admitted due to cardiogenic shock. Since then, the patient has not missed follow up appointments. Past medical history is significant for hypertension, type 2 diabetes, and hyperlipidemia. On examination, his temperature is 37°C (98.6°F), blood pressure is 120/70 mm Hg, heart rate 90/min, and respiration rate 16/min. A chest examination is unremarkable. Limb examination revealed a cold and pale left leg as compared to his right. In the left leg, pulses distal to the popliteal artery are not palpable. There is also loss of sensation on the dorsal aspect of the left foot and dorsiflexion is weak. What would be the most likely cause of this patient’s condition?