Psychotic Disorders - Differential Diagnosis Algorithm
Mood disorder with psychotic features
• Psychotic symptoms present exclusively during major mood syndrome
Schizoaffective disorder (bipolar & depressive)
• Psychotic symptoms also present outside of mood episodes
Brief psychotic disorder
• Duration of illness 1 month
Schizophreniform Disorder
• Duration of illness 1-6 months
Schizophrenia
• Duration of illness > 6 months
Delusional disorder
• Non-bizarre delusions 1 month, no decline in functioning, behaviour is not odd
Shared psychotic disorder (Folie a Deux)
• Delusions developed in context of close relationship with a person with already established similar delusion
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