Needle electromyographic studies of muscles of patients with myasthenia gravis would be expected to reveal:

While working in the emergency room you evaluate a patient with confusion, myoclonus, diarrhea, hypotension, tachycardia, and a normal creatine phosphokinase (CPK) level. The patient is not speaking. His family tells you that he was recently started on a new medication by his psychiatrist for treatment of bipolar disorder but they don't know what.

Between NMS and Serotonin syndrome, which diagnosis would you pick?

Which of the following magnetic resonance imaging (MRI) anomalies is most closely associated with patients diagnosed with Huntington’s disease?

Which of the following must be present to meet Diagnostic and Statistical Manual of Mental Disorders 5 (DSM 5) criteria for somatic symptom disorder?

A 65-year-old woman is brought to the emergency room from a nursing home. She is noted to have cognitive impairment, delusions, masked facies, shuffling gait, cogwheel rigidity of the extremities, visual hallucinations, and agitation. She is medicated by the emergency room physician with 5 mg of intramuscular haloperidol but experiences acute worsening of her muscular rigidity. The most likely diagnosis is:

Which one of the following is NOT an inhibitor of cytochrome P450 (CYP) 1A2?

Brain metastasis is most commonly due to which of the following?

The metabolite of which one of the following tricyclic antidepressants has potent dopamine-blocking ability that can lead to antipsychotic-like side effects?

The computed tomography (CT) scan of the brain shown here depicts which one of the following pathologies?

Which one of the following does not pertain to Wilson’s disease?

Which one of the following central nervous system (CNS) infections is most likely to produce ring-enhancing lesions on brain neuroimaging studies?

Which one of the following would NOT correlate with the brain imaging finding of thin gyri, wide sulci, and enlarged ventricles (especially the third ventricle)?

A left-sided middle cerebral artery territory stroke is most likely to produce which of the following?

You are studying two variables, a binary predictor variable and a continuous outcome variable. You want to know if the relationship between those two variables is due to chance alone. Which of the following tests would you use?