USMLE CK Test 9 Exam Questions with 100% Correct Answers

A 21-year-old man presents with auditory hallucinations and the delusion that federal narcotics agents are monitoring his telephone calls. He was dealing methamphetamine and using large amounts of the substance daily until about 1 week ago, when he exhausted his supply and was too frightened to leave his home to get more. Mental status examination reveals an alert and anxious individual who is oriented and coherent. Urine toxicology testing result for methamphetamine is negative. Which of the following is the most likely fundamental diagnosis? (A) Methamphetamine-induced anxiety disorder (B) Methamphetamine-induced delirium (C) Methamphetamine-induced psychotic disorder (D) Methamphetamine intoxication (E) Schizophrenia, paranoid type Correct Answer A patient with myasthenia gravis that has been well controlled with pyridostigmine for 2 years comes to the emergency department complaining of progressive muscle weakening during the last 24 hours. He has trouble swallowing and suffers from double vision. The patient has had flu-like symptoms for the past week. Which of the following is the most appropriate immediate course of action? (A) Increase the dose of pyridostigmine. (B) Replace pyridostigmine with physostigmine. (C) Give a small dose of edrophonium. (D) Decrease the dose of pyridostigmine. (E) Administer succinylcholine. Correct Answer A 30-year-old Caucasian woman who claims to never have smoked presents with bilateral puffiness and swelling of the fingers with joint pains. Cold exposure and stress cause episodes of blanching or cyanosis of the fingers. She is not on any medications. The mechanism for this patient's disease is most likely the result of which one of the following? (A) Vasospasm and thickening of the digital arteries (B) Hyperviscosity due to an increase in immuno -