Suicide is a leading cause of preventable death worldwide. Evidence supports the impact of providing active contact for individuals who have attempted suicide. The current systematic review and meta-analyses aim to investigate the effects of suicide prevention strategies implemented through remote and synchronous technology-based interventions.

Systematic review, narrative synthesis and meta-analysis.

Electronic databases (PubMed, PsycINFO, Scopus and Web of Science) and grey literature sources (ClinicalTrials.gov and Google Scholar) were searched until December 2024.

Eligible articles assessed suicide prevention interventions for participants over 12 years with prior suicidal behaviour. Eligible study designs included randomised controlled trials and non-randomised clinical trials published in English or Spanish.

Screening, selection process, data extraction and risk of bias assessment were performed independently by two reviewers. Data on suicide-related factors and adherence to treatment were extracted. Meta-analyses were conducted to determine effect sizes (Hedges’ g) for suicidal ideation, risk ratios (RR) for suicide attempts and Peto odds ratios (OR) for suicide. Heterogeneity was assessed using the Cochrane’s Q test, tau² statistic and I² value. Publication bias was investigated employing funnel plots and Egger’s test.

A total of 28 studies, comprising 10 015 participants in the intervention group and 10 726 in the comparison group, were included in the systematic review and meta-analyses. Synchronous remote-based interventions were effective in preventing repeated suicide attempts at 1 month (RR 0.73, 95% CI 0.62 to 0.85, I²=0.0%, Q=0.70, tau²=0.00), 6 months (RR 0.56, 95% CI 0.34 to 0.95, I²=85.4%, Q=54.92, tau²=0.36) and 12 months (RR 0.68, 95% CI 0.49 to 0.96, I²=87.6%, Q=72.63, tau²=0.27). Additionally, these interventions were associated with a reduction in suicide-related deaths at 18 months (Peto OR 0.18, 95% CI 0.08 to 0.44, I²=0.0%, Q=0.03, tau²=0.00). Effects on suicidal ideation were not statistically significant at any time point (Hedges’ g –0.07 to –0.28, I²=0.0 to 69.3%, Q=1.16 to 7.38, tau²=0.00 to 0.14).

Synchronous remote-based interventions demonstrate a potential benefit in preventing suicide attempts and deaths by suicide and may serve as an adjunct to usual treatment; however, the effect on suicidal ideation appears limited. The observed heterogeneity warrants caution when interpreting these findings. Future research should prioritise methodological enhancements to improve the quality and consistency of evidence, as well as investigate the mediating processes underlying their effectiveness in reducing suicidal behaviour.

CRD42021275044.