A 19-year-old woman is brought to the physician by her parents because of irritable mood that started 5 days ago. Since then, she has been staying up late at night working on a secret project. She is energetic despite sleeping less than 4 hours per day. Her parents report that she seems easily distracted. She is usually very responsible, but this week she spent her paycheck on supplies for her project. She has never had similar symptoms before. In the past, she has had episodes where she felt too fatigued to go to school and slept until 2 pm every day for 2 weeks at a time. During those times, her parents noticed that she cried excessively, was very indecisive, and expressed feelings of worthlessness. Two months ago, she had an asthma exacerbation and was treated with bronchodilators and steroids. She tried cocaine once in high school but has not used it since. Vital signs are within normal limits. On mental status examination, she is irritable but cooperative. Her speech is pressured and her thought process is linear. Which of the following is the most likely diagnosis?
AMajor depressive disorder
BBipolar I disorder
CBipolar II disorder
DSchizoaffective disorder
ESubstance abuse
A 24-year-old man is brought to your emergency department under arrest by the local police. The patient was found naked at a busy intersection jumping up and down on top of a car. Interviewing the patient, you discover that he has not slept in 2 days because he does not feel tired. He reports hearing voices. The patient was previously hospitalized 1 year ago with auditory hallucinations, paranoia, and a normal mood. What is the most likely diagnosis?
ASchizophrenia
BBipolar disorder
CBrief psychotic disorder
DSchizotypal disorder
ESchizoaffective disorder
A 57-year-old man is brought to the emergency department by the police after he was found running around a local park naked and screaming late at night. During intake, the patient talks non-stop about the government spying on him and his family, but provides little useful information besides his name and date of birth. Occasionally he refers to himself in the third person. He refuses to eat anything and will only drink clear fluids because he is afraid of being poisoned. A medical records search reveals that the patient has been treated for psychotic behavior and occasional bouts of severe depression for several years. Today, his heart rate is 90/min, respiratory rate is 19/min, blood pressure is 135/85 mm Hg, and temperature is 37.0°C (98.6°F). On physical exam, he appears gaunt and anxious. His heart has a regular rate and rhythm and his lungs are clear to auscultation bilaterally. CMP, CBC, and TSH are normal. A urine toxicology test is negative. What is the most likely diagnosis?
ASchizophrenia
BMajor depressive disorder
CSchizoaffective disorder
DBrief psychotic disorder
EBipolar 1 disorder
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