Schizoaffective Disorder

Criterion A

An uninterrupted period of illness during which there is a major mood episode (major depressive or manic) concurrent with Criterion A of schizophrenia.

Note: The major depressive episode must include Criterion A1: Depressed mood.
Criterion B

Delusions or hallucinations for 2 or more weeks in the absence of a major mood episode (depressive or manic) during the lifetime duration of the illness.

Criterion C

Symptoms that meet criteria for a major mood episode are present for the majority of the total duration of the active and residual portions of the illness.

Criterion D

The disturbance is not attributable to the effects of a substance (e.g., a drug of abuse, a medication) or another medical condition.

What is psychosis?

The term psychosis has been defined in various ways in the medical literature over time. The narrowest and current definition of psychosis is hallucinations and delusions, with the lack of reality testing or insight. A broader definition of psychosis would also include disorganized thought, emotions, and behaviour. This loose definition was more common in the past, and schizophrenia was often overdiagnosed as a result.

Comparison

Brief psychotic disorder
Onset Sudden
Length 1 day to 1 month
Psychotic Symptoms At least 1 of:
  • Delusions
  • Hallucinations
  • Disorganized speech
  • Grossly disorganized or catatonic behaviour
    Mood Symptoms No
    Functional Decline? Full resolution of symptoms
    Schizophreniform disorder
    Onset Can be prodromal
    Length 1 month to 6 months
    Psychotic Symptoms At least 2 of:
    • Delusions
    • Hallucinations
    • Disorganized speech
    • Grossly disorganized or catatonic behaviour
    • Negative symptoms
      Mood Symptoms No
      Functional Decline? Not required
      Schizophrenia
      Onset Can be prodromal
      Length > 6 months
      Psychotic Symptoms
      Mood Symptoms No
      Functional Decline? Required
      Schizoaffective disorder
      Onset Can be prodromal
      Length Major mood episode
      + 2 weeks of psychotic symptoms
      Psychotic Symptoms
      • Delusions or hallucinations for 2 or more weeks
      • Must be in absence of a major mood episode (depressive or manic) during the lifetime duration of the illness
        Mood Symptoms Required
        Functional Decline? Not required
        Delusional disorder
        Onset Can be prodromal
        Length > 1 month
        Psychotic Symptoms One or more delusions, with no other psychotic symptoms.
        Mood Symptoms No
        Functional Decline? Normal function aside from impact of delusions
        Type Onset Length Psychotic Symptoms Mood Symptoms Functional Decline?
        Brief psychotic disorder Sudden 1 day to 1 month At least 1 of:
        • Delusions
        • Hallucinations
        • Disorganized speech
        • Grossly disorganized or catatonic behaviour
          No Full resolution of symptoms
          Schizophreniform disorder Can be prodromal 1 month to 6 months At least 2 of:
          • Delusions
          • Hallucinations
          • Disorganized speech
          • Grossly disorganized or catatonic behaviour
          • Negative symptoms
            No Not required
            Schizophrenia Can be prodromal > 6 months No Required
            Schizoaffective disorder Can be prodromal Major mood episode
            + 2 weeks of psychotic symptoms
            • Delusions or hallucinations for 2 or more weeks
            • Must be in absence of a major mood episode (depressive or manic) during the lifetime duration of the illness
              Required Not required
              Delusional disorder Can be prodromal > 1 month One or more delusions, with no other psychotic symptoms. No Normal function aside from impact of delusions

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