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Review Question - QID 212569

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QID 212569 (Type "212569" in App Search)
A 28-year-old man is brought to the emergency department after he was found half dressed and incoherent in the middle of the road. In the emergency department he states that he has not slept for 36 hours and that he has incredible ideas that will make him a billionaire within a few months. He also states that secret agents from Russia are pursuing him and that he heard one of them speaking through the hospital intercom. His past medical history is significant only for a broken arm at age 13. On presentation, his temperature is 102.2°F (39°C), blood pressure is 139/88 mmHg, pulse is 112/min, and respirations are 17/min. Physical exam reveals pupillary dilation and psychomotor agitation. Which of the following mechanisms is most likely responsible for this patient's symptoms?