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170539 Medicine

A 68-year-old man is seen in the emergency room after an unwitnessed syncopal episode. His wife heard a strange noise and found him confused and on the floor of the living room where he had been watching television. His wife tells you that he has no ongoing medical problems, does not take any medications, and does not use alcohol or illicit drugs. On examination the patient is drowsy, has a tongue laceration, and his pants are wet with urine. Serum electrolytes (including sodium and calcium) are normal and urine drug screen is negative. Which of the following is the best next step in evaluation?

AMRI scan of brain
BLumbar puncture
CHolter monitor
DCT scan of head
Medicine
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