PS43 - The Effect of Psychosocial Interventions on Suicidal Ideation and Self-Harm - An Overview of Scientific Evidence

Evaluation of Suicide in Trials of Psychological Interventions for Depression: A Meta-Analysis
August, 30 | 17:30 - 19:00

Background: As effective depression treatments, psychological interventions could indirectly impact suicide-related outcomes. We examined suicidal thoughts and behaviors as eligibility criteria, outcomes, and adverse effects (AEs) across trials of psychotherapy for depression. Methods: We used a publicly available meta-analytic database, developed through systematic searches, updated May 1st 2023. Included were randomized trials comparing psychological interventions for adult depression with control conditions and reporting on any suicide-related outcomes. Two reviewers independently selected studies and extracted data. Risk of bias was assessed with the Cochrane Risk of Bias 2.0. tool. Effect sizes were calculated as standardized mean differences (SMD) and pooled with a random effects model with robust variance estimation. Outcomes: Of 469 reports, 251 excluded at-risk participants and 44 reported any evaluation of suicide. Of these, 12 trials, representing 3919 randomized participants, of which 2795 (71%) identified as women, assessed suicidal ideation or risk. Psychological interventions had a small, significant effect on suicidal ideation and risk combined at post-test (11 trials, SMD= -0.31, 95% CI -0.6 to -0.03), but not follow-up (6 trials, SMD= -0.49, 95% CI -1.31 to 0.32). Effects were similar for suicidal ideation only at post-test (9 trials, SMD= -0.36, 95% CI -0.7 to-0.02) and follow-up (3 trials, SMD= -0.36, 95% CI -1.87 to 1.15). The exclusion of two trials in which the intervention included a component targeting suicide resulted in a smaller, non-significant effect (SMD= -0.2, 95% CI -0.46 to 0.06). Heterogeneity was substantial across all analyses and prediction intervals crossed zero. Twenty-five trials reported suicide-related AEs, 13 of which serious (e.g., attempts, deaths). Interpretation: Trials of psychological interventions for depression rarely report evaluating suicide. Psychological interventions, particularly with a component targeting suicide, might reduce suicidal ideation in patients with depression. Monitoring and reporting of suicide-related AEs should improve and future depression trials should incorporate outcomes related to suicidal thoughts or behaviors.

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