Review Question - QID 107188

A 70-year-old male patient comes into your office because of leg pain. The patient states that his calves have been hurting more and more over the last two months. The pain isn't present at rest, but the pain develops as the patient starts walking and exerting himself. He states that stopping to rest is the only thing that relieves the pain. Of note, the patient's medical history is significant for 30-pack-years of smoking, hypertension, hyperlipidemia, and a previous myocardial infarction status-post angioplasty and stent. On exam, the patient's lower legs (below knee) have glossy skin with loss of hair. The dorsalis pedis pulses are barely palpable bilaterally. Which of the following is the best initial therapy for this patient?