USMLE Step 3 Quiz
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PSYCHIATRY
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A 74-year-old man with a remote history of alcohol use disorder (abstinent for 10 years) is admitted to the hospital for pneumonia. On hospital day 3, he becomes acutely confused, agitated, and tremulous. His heart rate is 120/min, and blood pressure is 165/95 mm Hg. He is afebrile. His daughter reports that although he has not had a drink in years, he has been taking an over-the-counter 'herbal nerve tonic' containing valerian root nightly for sleep.
The patient's clinical presentation is most likely due to withdrawal from a substance that acts on which of the following receptors?
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