Abstract
BACKGROUND: Conflicting evidence exists about the relationship between psychotic symptoms and suicidality in mood disorders. We aimed to investigate the lifetime suicidality and its relationship with dimensions of the psychotic spectrum over the lifespan among subjects with bipolar I (BD I) or major depressive disorder (MDD). METHODS: 147 Consecutive out- and inpatients with BD I or MDD presenting for treatment at 11 Italian Departments of Psychiatry were administered the Structured Clinical Interview for DSM-IV Axis I Disorders, the Structured Clinical Interview for the Psychotic Spectrum (SCI-PSY, lifetime version) and the Mood Spectrum Self-Report (MOODS-SR, lifetime version). RESULTS: Subjects with psychotic features did not differ from those without for MOODS-SR suicidality score. Controlling for age, gender and diagnosis (MDD/BD I), the SCI-PSY total score (p = .007) and Paranoid (p = .042), Schizoid (p = .007) and Interpersonal Sensitivity (p < .001) domain scores independently predicted lifetime MOODS-SR suicidality score in the overall sample. CONCLUSIONS: Psychotic features, as evaluated upon the presence of delusions or hallucinations, are not associated with suicidality among subjects with BD I or MDD. However, more subtle dimensions of the psychotic spectrum, such as Interpersonal Sensitivity, Paranoid and Schizoid symptoms, show a significant relationship with lifetime suicidality. Our findings highlight the potential usefulness of a spectrum approach in the assessment of psychotic symptoms and suicide risk among subjects with BD I or MDD.