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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.
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A 62-year-old man is brought to the emergency department because of right-sided weakness and subjective decreased sensation that started 30 minutes ago. The patient reports that his symptoms started to ease 5 minutes after onset and have now completely resolved. He has hypertension, hyperlipidemia, and type 2 diabetes mellitus. He has smoked one pack of cigarettes daily for 40 years. His current medications include lisinopril, metformin, and sitagliptin. He is 183 cm (6 ft 0 in) tall and weighs 105 kg (220 lb); BMI is 32 kg/m2. He appears well. His temperature is 36.5°C (97.7°F), pulse is 80/min, and blood pressure is 150/88 mm Hg. Neurological examination shows no abnormalities. Cardiac examination shows regular rate and rhythm and a left-sided carotid bruit. Complete blood count, serum glucose, and electrolytes are within the reference ranges. An ECG shows sinus rhythm and left axis deviation. A CT scan of the head without contrast shows no abnormalities. Carotid doppler ultrasound shows 45% stenosis in the left carotid artery and 15% stenosis in the right. Which of the following is the most appropriate next step in management?
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Antiplatelet therapy