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Topic: Diagnostic Investigations
Subject: Medicine
A 50-year-old male is brought to the emergency department because of a syncopal episode. Prior to the episode, he felt bad for 30 minutes, then developed nausea followed by vomiting. During a second bout of vomiting he blacked out and fell to the floor. His wife did not observe any seizure activity, and he was unconscious only for a few seconds. His history is otherwise negative, his past medical history is unremarkable, and he currently takes no medications. A physical examination is normal.
Which one of the following would be the most helpful next step?

A. CT of the head

B. Carotid ultrasonography

C. A CBC and complete metabolic profile

D. An EKG

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