Investigating the prevalence of dissociative disorders and severe dissociative symptoms in first episode psychosis.

Aim Increasing evidence suggests that childhood trauma and dissociation are associated with psychotic symptoms and disorders. Significant rates of dissociative disorders and clinical levels of dissociative symptoms are found in chronic schizophrenia. To date, no studies have examined the prevalence of these in a first episode psychosis (FEP) group. This study aimed to investigate the prevalence of dissociative disorders and symptoms in a FEP sample as well as the prevalence of severe dissociative symptoms in those with or without experiences of childhood trauma. Methods Sixty-six young people with FEP completed a research interview which included the structured clinical interview for Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition (DSM-IV) Axis I Disorders, Childhood Trauma Questionnaire and the Structured Clinical Interview for DSM-IV Dissociative Disorders-Revised. Results Dissociative symptoms at clinical levels were found in 36.4% of the sample. Furthermore, 13.6% of the sample met diagnostic criteria for a lifetime dissociative disorder. Significant differences in the frequency of clinical dissociative symptoms between those with or without childhood trauma were also found. Conclusions Dissociative symptoms should be routinely assessed for in early intervention settings, especially in cases where childhood trauma is disclosed or suspected. Where present, dissociative symptoms should also be incorporated into subsequent case formulation and treatment planning.