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A 65-year-old male comes to the emergency department because of a sudden, painless loss of vision in his right eye that occurred a half an hour ago. Five hours ago, he experienced a similar but transient loss of vision in the same eye, which lasted for five minutes. He has hypertension, diabetes, hypercholesterolemia, and peripheral vascular disease. He had an anterior wall myocardial infarction six years ago. His medications include glyburide, captopril, atenolol, simvastatin, and aspirin. His temperature is 36.7° C (98.0° F), respirations are 16/min, pulse is 88/min, and blood pressure is 146/88 mm Hg. Examination of the right eye reveals visual acuity of 20/60 and subtle retinal whitening. A right carotid bruit is heard. Which of the following is the most appropriate next step in the management of this patient?
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