Problem: Identify the patient who the nurse practitioner should refer to a vascular surgeon. A 95-year-old patient with 50% stenosis of the right coronary artery A 98-year-old patient who has no symptoms and noted to have 70% stenosis of the right coronary artery on a routine examination A 55-year-old patient who has 20% stenosis of the left coronary artery complaining of a headache A 70-year-old male patient noted to have 75% carotid artery stenosis on a routine examination