Q. A 60-year-old male presets to the clinic with complaints of pain in his right thigh. The pain is described as dull and crampy in nature. He stated that the pain is triggered by walking and relieved by resting for 10 minutes or longer. When asked where the pain is localized, the patient points to the anterior and lateral side of the right thigh. Past medical history is unremarkable and he does not take any medications. The patient does not consume alcohol, but has a 35-pack year smoking history. On physical examination, all pulses distal to the femur are diminished. Ankle-brachial index is 0.98 on left and 0.72 on the right. Which of the following is the most appropriate next step in management of this patient?