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Difficulty: EasySchizophrenia and Psychotic Disorders

A 19-year-old female college student is evaluated at the student health clinic after her resident advisor expressed concerns about her behavior. According to the advisor, the patient has isolated herself in her dormitory for the past seven months. During this entire period, she has consistently claimed that the university's Wi-Fi network is transmitting government mind-control signals into her brain. She is frequently observed pacing the hallways at night while mumbling and responding to unseen individuals. The patient's academic performance has dropped significantly, and her emotional expression during the interview is noticeably flat. She has no history of substance use or medical illnesses, and a urine toxicology screen is negative. Which of the following is the most appropriate diagnosis?

  1. A
    Brief psychotic disorder
  2. B
    Schizoaffective disorder
  3. SchizophreniaAnswer
  4. D
    Schizophreniform disorder
  5. E
    Delusional disorder

Answer

The most appropriate diagnosis is schizophrenia, as the patient has exhibited active psychotic symptoms and functional decline for greater than 6 months.
The correct diagnosis is schizophrenia. This patient presents with delusions, auditory hallucinations, and negative symptoms (flat affect) along with a significant decline in social and academic functioning. The key differentiating factor is the duration of her symptoms, which is explicitly stated as seven months. The DSM-5 criteria for schizophrenia require continuous signs of the disturbance for at least 6 months, which includes at least 1 month of active-phase symptoms. Since her symptoms have exceeded the 6-month threshold and other causes (substances, mood episodes) have been ruled out, schizophrenia is the most accurate diagnosis.

Step-by-Step Solution

1
Identify the patient's presenting symptoms.
The patient has delusions (mind-control signals), hallucinations (responding to unseen individuals), negative symptoms (flat affect), and functional decline (poor academic performance, isolation).
Establishing the symptom profile is the first step in evaluating a suspected psychiatric disorder.
2
Determine the duration of the symptoms.
The symptoms have been present continuously for the past seven months.
Symptom duration is the primary criterion for distinguishing between brief psychotic disorder, schizophreniform disorder, and schizophrenia.
3
Rule out other psychiatric or medical causes.
There is no history of mood episodes (ruling out schizoaffective or mood disorders with psychotic features), and the urine toxicology screen is negative (ruling out substance-induced psychosis).
Psychiatric diagnoses are made only after ruling out substance use, medical conditions, and other primary psychiatric disorders.

Key Concept

The diagnosis of schizophrenia requires the presence of at least two active-phase symptoms (e.g., delusions, hallucinations, disorganized speech) for at least 1 month, with continuous signs of the disturbance persisting for at least 6 months.
Estimated Time:50s
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Topics

Schizophrenia and Psychotic Disorders

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