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Difficulty: Very hardSchizophrenia and Psychotic Disorders

Match each patient's clinical presentation and symptom timeline to the most appropriate DSM-5 psychiatric diagnosis.

  • Patient exhibits auditory hallucinations and flat affect for 7 months. During this total duration, a major depressive episode was present for only 6 weeks.Schizophrenia
  • Patient exhibits persecutory delusions and disorganized behavior for 4 months with severe social impairment. No mood episodes have ever occurred.Schizophreniform disorder
  • Patient has a 4-year history of delusions. Major depressive episodes have been present for 3 years of this time. Currently, the patient is euthymic but has had hallucinations for the past month.Schizoaffective disorder
  • Patient presents with a 1-month history of severe depressed mood, hypersomnia, and feelings of worthlessness, accompanied simultaneously by voices saying 'you deserve to die'.Major depressive disorder with psychotic features
  • Patient develops sudden onset of disorganized speech and persecutory delusions lasting 14 days following a severe motor vehicle collision, followed by a complete return to baseline functioning.Brief psychotic disorder

Answer

The correct matches rely on accurately applying the precise DSM-5 duration criteria for psychosis (<1 month, 1-6 months, >6 months) and calculating the proportional overlap of mood symptoms over the total illness duration.
The diagnosis of primary psychotic disorders and mood disorders with psychotic features depends critically on symptom duration and the temporal relationship between mood and psychotic symptoms. Brief psychotic disorder lasts less than 1 month, schizophreniform disorder lasts 1-6 months, and schizophrenia requires at least 6 months of symptoms. To differentiate schizoaffective disorder from schizophrenia, mood symptoms must be present for a majority of the total illness duration in schizoaffective disorder; if they are present for a minority of the time, it is classified as schizophrenia. If psychotic symptoms occur exclusively during mood episodes without independent periods of psychosis, the diagnosis is a primary mood disorder with psychotic features.

Step-by-Step Solution

1
Analyze the total uninterrupted duration of the psychotic symptoms.
Identify if the primary psychotic symptoms have been present for <1 month (Brief Psychotic Disorder), 1-6 months (Schizophreniform Disorder), or >6 months (Schizophrenia).
Duration is the primary differentiating factor for isolated psychotic disorders.
2
Assess the chronological relationship between psychosis and mood episodes.
Determine if psychosis ever occurs for >=2 weeks in the complete absence of a mood episode.
This differentiates Schizoaffective disorder (psychosis without mood for >=2 weeks) from MDD with psychotic features (psychosis occurs exclusively during mood episodes).
3
Calculate the proportion of time mood symptoms are present relative to the total duration of the illness.
Identify if the mood symptoms are present for a majority (>50%) or minority (<50%) of the total active and residual periods.
Schizoaffective disorder strictly requires mood symptoms to be present for the majority of the total illness duration; otherwise, a patient with a long psychotic history and brief mood episodes is diagnosed with Schizophrenia.

Key Concept

Differentiation of psychotic disorders based on exact total symptom duration and the longitudinal proportion of concurrent mood symptoms (majority vs. minority of illness duration).
Estimated Time:2m 0s
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Topics

Schizophrenia and Psychotic Disorders

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