system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
A 76-year-old man comes to the emergency department because of an episode of seeing jagged edges followed by loss of central vision in his right eye. The episode occurred 6 hours ago and lasted approximately 5 minutes. The patient has no pain. He has a 3-month history of intermittent blurriness out of his right eye and reports a 10-minute episode of slurred speech and left-sided facial droop that occurred 2 months ago. He has hypercholesterolemia, stable angina pectoris, hypertension, and a 5-year history of type 2 diabetes mellitus. Medications include glyburide, atorvastatin, labetalol, isosorbide, lisinopril, and aspirin. He feels well. He is oriented to person, place, and time. His temperature is 37°C (98.6°F), pulse is 76/min, respirations are 12/min, and blood pressure is 154/78 mm Hg. The extremities are well perfused with strong peripheral pulses. Ophthalmologic examination shows visual acuity of 20/30 in the left eye and 20/40 in the right eye. Visual fields are normal. Fundoscopic examination shows two pale spots along the supratemporal and inferotemporal arcade. Neurologic examination shows no focal findings. Cardiopulmonary examination shows systolic rumbling at the right carotid artery. The remainder of the examination shows no abnormalities. An ECG shows normal sinus rhythm with no evidence of ischemia. Which of the following is the most appropriate next step in management?
assistant
Carotid duplex ultrasonography