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Difficulty: MediumSchizophrenia and Psychotic Disorders

A 34-year-old woman is brought to the outpatient psychiatry clinic by her husband for a follow-up evaluation. He reports that 9 months ago, the patient became increasingly withdrawn, reported feeling profound sadness every day, had significant difficulty sleeping, and lost interest in her usual hobbies. Three months after these initial symptoms began, she started telling her husband that their neighbors were "broadcasting" negative thoughts into her mind and frequently appeared to be responding to unseen voices. She was started on an antidepressant and an antipsychotic medication. Over the past 8 weeks, her mood, energy levels, and sleep have completely returned to normal, and she expresses looking forward to the future. However, she continues to hear the voices daily and insists that the neighbors are still targeting her. She has no history of substance use or medical conditions. 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: (1) a major mood episode concurrent with active-phase symptoms of schizophrenia; (2) delusions or hallucinations lasting for ≥2\geq 2 weeks in the absence of a major mood episode; and (3) mood symptoms that are present for the majority of the total duration of the illness. This patient's total illness duration is 9 months. She experienced a major depressive episode for 7 months (making up the majority of the total illness), and she has now experienced psychotic symptoms for 8 weeks in the complete absence of mood symptoms.

Step-by-Step Solution

1
Determine the total duration of the illness.
The illness began 9 months ago when the depressive symptoms started.
Establishing the total timeline is required to assess the proportion of time the patient has experienced mood symptoms.
2
Determine the duration of the major mood episode.
The depressive symptoms were present for the first 7 months (3 months alone + 4 months concurrent with psychosis) before resolving 8 weeks ago.
Diagnostic criteria for schizoaffective disorder require mood symptoms to be present for the majority of the total illness duration (7/9 months is a majority).
3
Determine the timing of the psychotic symptoms relative to the mood symptoms.
Psychotic symptoms began 3 months into the illness and are still present. Critically, they have persisted for the last 8 weeks while the patient's mood has been entirely normal.
Psychotic symptoms occurring for ≥2\geq 2 weeks in the absence of a major mood episode differentiates schizoaffective disorder from major depressive disorder with psychotic features.
4
Synthesize the timeline findings to select the correct diagnosis.
The combination of concurrent mood/psychosis, psychosis without mood for ≥2\geq 2 weeks, and mood symptoms present for the majority of the illness confirms schizoaffective disorder.
Applying DSM-5 timeline criteria is the definitive way to differentiate these overlapping psychiatric syndromes.

Key Concept

Schizoaffective disorder requires an uninterrupted period of illness featuring a major mood episode concurrent with schizophrenia symptoms, delusions or hallucinations for ≥2\geq 2 weeks in the absence of mood symptoms, and mood symptoms present for the majority of the total illness duration.
Estimated Time:1m 30s
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Topics

Schizophrenia and Psychotic Disorders

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