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Difficulty: EasySchizophrenia and Psychotic Disorders

A 38-year-old woman with no prior medical or psychiatric history is evaluated in the outpatient clinic after her employer mandated a medical leave of absence. According to her husband, the patient has spent the last 4 months obsessively dismantling the home smoke detectors and covering all the windows with heavy blankets. She claims that a coordinated surveillance team is transmitting voices directly into her ears, warning her of an impending abduction. The husband notes that her personal hygiene has deteriorated significantly during this timeframe, and she rarely leaves her bedroom. Physical examination, routine laboratory studies, and a comprehensive urine toxicology screen are all within normal limits. Which of the following is the most appropriate diagnosis?

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

Answer

The most appropriate diagnosis is schizophreniform disorder, as the patient presents with classic psychotic symptoms lasting between 1 and 6 months.
The correct answer accurately reflects the DSM-5 criteria for schizophreniform disorder. The patient has two or more active-phase psychotic symptoms (delusions, hallucinations, negative symptoms) that have been present for a significant portion of time over a 4-month period. Because the total duration of the disturbance is greater than 1 month but less than 6 months, schizophreniform disorder is the definitive diagnosis.

Step-by-Step Solution

1
Identify the patient's core psychiatric symptoms.
The patient exhibits delusions (surveillance team), auditory hallucinations (voices in her ears), and negative symptoms/functional decline (deteriorated hygiene, isolation).
Establishing the presence of active-phase psychotic symptoms is the first step in diagnosing a primary psychotic disorder.
2
Determine the exact duration of the psychotic symptoms.
The husband reports the symptoms have been present for exactly 4 months.
Duration is the primary differentiating factor between acute and chronic psychotic spectrum disorders in the DSM-5.
3
Rule out secondary causes of psychosis.
Physical examination, labs, and a urine toxicology screen are normal, ruling out substance-induced psychosis or psychosis due to a medical condition.
A primary psychiatric diagnosis can only be made after organic etiologies are excluded.
4
Apply the timeline criteria for primary psychotic disorders.
Symptoms lasting >1 month but <6 months meet the criteria for schizophreniform disorder.
Less than 1 month indicates brief psychotic disorder; greater than 6 months indicates schizophrenia.

Key Concept

The diagnosis of primary psychotic disorders is highly dependent on the duration of symptoms: Brief Psychotic Disorder (<1 month), Schizophreniform Disorder (1-6 months), and Schizophrenia (>6 months).
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Topics

Schizophrenia and Psychotic Disorders

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