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Difficulty: MediumSchizophrenia and Psychotic Disorders

A 22-year-old man is evaluated in a dual-diagnosis residential facility. Two months ago, he was hospitalized following an episode of severe agitation where he claimed that government drones were injecting thoughts into his mind. This psychotic episode began immediately after a three-day binge of smoking methamphetamine. He was subsequently transferred to the current facility, where he has been monitored continuously and has had negative urine toxicology screens twice weekly for the past 7 weeks. Despite confirmed abstinence from all illicit substances during this 7-week period, the patient continues to experience daily auditory hallucinations and expresses the belief that the facility staff are government agents. He has not exhibited any significant depressive or manic symptoms. Which of the following is the most likely diagnosis?

  1. Schizophreniform disorderAnswer
  2. B
    Substance/medication-induced psychotic disorder
  3. C
    Schizophrenia
  4. D
    Brief psychotic disorder
  5. E
    Schizoaffective disorder

Answer

Schizophreniform disorder
This patient presents with active-phase psychotic symptoms (delusions, auditory hallucinations) that have been present for exactly 2 months. To differentiate primary psychotic disorders, timeline is the crucial metric: symptoms lasting <1 month signify brief psychotic disorder, 1 to 6 months signify schizophreniform disorder, and >6 months signify schizophrenia. Furthermore, while his initial presentation was heavily associated with methamphetamine use, his symptoms have persisted for 7 weeks of strictly monitored abstinence. According to DSM-5 criteria, psychotic symptoms that persist for longer than 1 month after the cessation of acute substance intoxication or withdrawal indicate an underlying primary psychotic disorder, rather than a substance-induced state. Given the 2-month total duration and lack of mood symptoms, the most accurate diagnosis is schizophreniform disorder.

Step-by-Step Solution

1
Identify the primary psychiatric symptoms.
The patient exhibits active-phase psychotic symptoms including auditory hallucinations and persecutory delusions.
Establishing the presence of psychosis is the first step in formulating a differential diagnosis.
2
Determine the relationship between the symptoms and substance use.
The psychosis began after methamphetamine use but has persisted for 7 weeks despite confirmed abstinence.
If psychosis persists for >1 month after substance cessation, a primary psychotic disorder must be diagnosed instead of a substance-induced disorder.
3
Calculate the total continuous duration of the psychotic symptoms.
The symptoms have been present continuously for 2 months.
Duration is the primary differentiating factor among brief psychotic disorder (<1 month), schizophreniform disorder (1-6 months), and schizophrenia (>6 months).
4
Evaluate for the presence of concurrent mood episodes.
The patient has no significant depressive or manic symptoms.
The absence of mood episodes rules out schizoaffective disorder and bipolar/depressive disorders with psychotic features.

Key Concept

Differentiation of psychotic disorders based on symptom duration and the relationship to substance use cessation.
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Topics

Schizophrenia and Psychotic Disorders

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