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Difficulty: MediumSchizophrenia and Psychotic Disorders

A 27-year-old woman is brought to the psychiatric clinic by her wife due to concerning behavioral changes. The patient has a history of intermittent profound sadness, anhedonia, and hypersomnia that first began 8 months ago. During these periods of low mood, she frequently reports hearing derogatory voices commenting on her actions. Medical records indicate that she was treated with an antidepressant 4 months ago, which completely resolved her low mood, anhedonia, and sleep disturbances for a period of 5 weeks. However, during that 5-week period of normal, euthymic mood, she continued to hear the same derogatory voices and developed a new fixed belief that her neighbors were planting cameras in her walls. For the past 3 months, her severe low mood and hypersomnia have returned alongside the persistent auditory hallucinations and delusions. A urine toxicology screen is negative, and her physical examination is unremarkable. Which of the following is the most likely diagnosis?

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

Answer

Schizoaffective disorder
The correct diagnosis is schizoaffective disorder. According to DSM-5 criteria, schizoaffective disorder requires a major mood episode (depressive or manic) concurrent with symptoms of schizophrenia, AND a period of at least 2 weeks where delusions or hallucinations are present in the absence of a major mood episode. This patient had a 5-week period of euthymia during which she continued to experience auditory hallucinations and developed new delusions, perfectly satisfying this key criterion. Furthermore, mood symptoms must be present for the majority of the total duration of the active and residual periods of the illness (in this scenario, mood symptoms were present for approximately 7 out of the 8 months).

Step-by-Step Solution

1
Identify the primary symptom clusters and their total duration.
The patient has both major depressive symptoms (sadness, anhedonia, hypersomnia) and psychotic symptoms (auditory hallucinations, delusions) lasting for a total of 8 months.
Establishing the total timeline and symptom types is the first step in differentiating psychiatric disorders.
2
Determine the temporal relationship between the mood symptoms and psychotic symptoms.
Psychotic symptoms occurred concurrently with mood symptoms, but also persisted for a 5-week period when the patient was completely euthymic (free of mood symptoms).
The relationship between psychosis and mood episodes is the key differentiator between primary psychotic disorders and mood disorders with psychotic features.
3
Apply the DSM-5 diagnostic criteria for schizoaffective disorder.
The criteria require an uninterrupted period of illness with a major mood episode concurrent with psychotic symptoms, plus delusions or hallucinations for 2 or more weeks in the absence of a major mood episode.
The 5-week period of isolated psychosis confirms schizoaffective disorder and rules out major depressive disorder with psychotic features.

Key Concept

To diagnose schizoaffective disorder, a patient must have delusions or hallucinations for at least 2 weeks in the absence of a major mood episode (depressive or manic) during the lifetime duration of the illness.
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Topics

Schizophrenia and Psychotic Disorders

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