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Difficulty: MediumSchizophrenia and Psychotic Disorders

A 28-year-old woman is brought to the psychiatry clinic by her husband. He reports that for the past month, she has been experiencing exceptionally low mood, sleeping up to 14 hours a day, eating very little, and expressing pervasive, inappropriate guilt. The husband notes that her psychiatric struggles began three years ago. Over the past three years, she has spent approximately thirty months experiencing either severe depression or acute mania. However, he specifically recalls a distinct four-week period last summer where her mood, energy, and sleep were completely normal, yet she firmly believed the television was broadcasting secret messages directed at her and frequently heard voices conversing about her actions. She takes no medications, and her urine toxicology screen is negative. Which of the following is the most likely diagnosis?

  1. Schizoaffective disorderAnswer
  2. B
    Bipolar I disorder with psychotic features
  3. C
    Schizophrenia
  4. D
    Major depressive disorder with psychotic features
  5. E
    Schizophreniform disorder

Answer

Schizoaffective disorder is the correct diagnosis because the patient has a history of major mood episodes comprising the majority of her illness, combined with at least 2 weeks of psychotic symptoms occurring in the absence of mood symptoms.
The correct answer is Schizoaffective disorder. This diagnosis requires an uninterrupted period of illness during which there is a major mood episode (depressive or manic) concurrent with Criterion A of schizophrenia (e.g., delusions, hallucinations). Crucially, to distinguish it from a mood disorder with psychotic features, there must be delusions or hallucinations for at least 2 weeks in the absence of a major mood episode during the lifetime duration of the illness. To distinguish it from schizophrenia, mood symptoms must be present for the majority of the total duration of the active and residual periods of the illness. This patient has a 3-year history of illness with mood symptoms present for 30 months (the vast majority of the time), but importantly, she had a 4-week period of prominent psychotic symptoms (delusions of reference and auditory hallucinations) in the absence of any mood symptoms.

Step-by-Step Solution

1
Evaluate the timeline and presence of mood symptoms.
The patient has a 3-year history of illness, with 30 months characterized by major mood episodes (severe depression and acute mania).
Establishing the total duration of mood episodes relative to the total illness duration is necessary to differentiate between schizophrenia and schizoaffective disorder.
2
Evaluate the timeline of psychotic symptoms relative to mood episodes.
The patient experienced a 4-week period of prominent psychosis (delusions and auditory hallucinations) while her mood was completely normal.
Identifying psychosis that occurs independently of mood episodes rules out primary mood disorders with psychotic features.
3
Synthesize the findings to determine the correct diagnosis.
The combination of major mood episodes present for the majority of the illness and a period of >2 weeks of psychosis in the absence of mood symptoms points to schizoaffective disorder.
These specific timeline criteria form the DSM-5 definition of schizoaffective disorder.

Key Concept

To diagnose schizoaffective disorder, a patient must have major mood episodes that are present for the majority of the total illness duration, AND they must exhibit delusions or hallucinations for at least 2 weeks in the absence of a major mood episode.
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Topics

Schizophrenia and Psychotic Disorders

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