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Difficulty: MediumSchizophrenia and Psychotic Disorders

A 35-year-old woman is brought to the psychiatric clinic by her husband due to behavioral changes over the past 3 months. Her husband reports that she recently took a sudden leave of absence from her job as a middle school teacher. During the interview, the patient states she had to stop teaching because the school's intercom system was intercepting her private thoughts and broadcasting them to the students. She also reports hearing two distinct male voices discussing her daily activities. These symptoms began precisely 3 months ago, shortly after she moved to a new neighborhood, and have been present continuously since. She has no history of depressive or manic episodes, and her medical history is unremarkable. A urine toxicology screen is negative. Which of the following is the most likely diagnosis?

  1. A
    Brief psychotic disorder
  2. Schizophreniform disorderAnswer
  3. C
    Schizophrenia
  4. D
    Schizoaffective disorder
  5. E
    Delusional disorder

Answer

Schizophreniform disorder is the correct diagnosis because the patient has active-phase psychotic symptoms lasting between 1 and 6 months.
The correct answer is schizophreniform disorder. The patient presents with two Criterion A symptoms of schizophrenia (delusions and auditory hallucinations) resulting in functional impairment. The critical differentiating factor is the duration of her symptoms. In the DSM-5, the distinction between brief psychotic disorder, schizophreniform disorder, and schizophrenia is strictly based on time. Symptoms lasting at least 1 day but less than 1 month constitute brief psychotic disorder. Symptoms lasting between 1 month and 6 months constitute schizophreniform disorder. Symptoms persisting for 6 months or longer are required for a diagnosis of schizophrenia. Because this patient's symptoms have been present for exactly 3 months, schizophreniform disorder is the only appropriate diagnosis.

Step-by-Step Solution

1
Identify the patient's primary symptoms and their impact.
The patient has delusions (thought broadcasting) and auditory hallucinations leading to significant functional impairment (leave of absence from work).
Establishing the presence of active-phase psychotic symptoms (Criterion A for schizophrenia) is the first step in the diagnostic algorithm.
2
Determine the exact duration of the psychotic symptoms.
The symptoms began precisely 3 months ago and have been continuous.
Duration is the primary differentiating factor among primary psychotic disorders.
3
Rule out mood disorders, substance use, and general medical conditions.
The patient has no mood history, unremarkable medical history, and negative toxicology, ruling out schizoaffective disorder, bipolar disorder, major depression with psychotic features, and substance-induced psychosis.
Psychiatric diagnoses are made after ruling out secondary causes and concurrent major mood episodes.
4
Apply the duration criteria to the remaining primary psychotic disorders.
A duration of 3 months is greater than 1 month (ruling out brief psychotic disorder) but less than 6 months (ruling out schizophrenia), leading to a diagnosis of schizophreniform disorder.
To synthesize the clinical presentation with strict DSM-5 timeframes.

Key Concept

The primary differentiating factor between brief psychotic disorder, schizophreniform disorder, and schizophrenia is the duration of symptoms.
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Topics

Schizophrenia and Psychotic Disorders

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