Q. A 60-year-old man presents to your primary care clinic with complaints of cramping pain and fatigue in his left calf during walking. He reports that these symptoms occur consistently after walking approximately half a block and are relieved with rest. He has a medical history of hypertension, hyperlipidemia, and a long-standing smoking habit. His temperature is 98.6°F (37°C), pulse is 90 beats per minute, blood pressure is 130/90 mmHg, and respiratory rate is 14 per minute. On examination, you note that the patient has weak pulses in the left dorsalis pedis and posterior tibial arteries. What is the most appropriate next step in management?