A 72-year-old man is brought to emergency by his wife after experiencing a 20-minute episode of weakness of his right arm and face. Blood pressure is 110/70. He takes no medications. ECG shows no abnormalities. Which of the following is the next best step in management?
Ambulatory ECG monitoring
Carotid angiography
Carotid duplex ultrasonography
Echocardiogram
Thyroid function tests
