• Kate E McBride, Michael J Solomon, Paul G Bannon, Nicholas Glozier, and Daniel Steffens.
• Institute of Academic Surgery, Royal Prince Alfred Hospital, Sydney, NSW.
• Med. J. Aust. 2021 May 1; 214 (8): 379-385.

ObjectiveTo assess the association between having a serious mental illness and surgical outcomes for adults, including in-hospital and 30-day mortality, post-operative complications, and hospital length of stay.Study DesignSystematic review and meta-analysis of publications in English to 30 July 2018 of studies that examined associations between having a serious mental illness and surgical outcomes for adults who underwent elective surgery. Primary outcomes were in-hospital and 30-day mortality, post-operative complications, and length of hospital stay. Risk of bias was assessed with the Quality in Prognosis Studies (QUIPS) tool. Studies were grouped by serious mental illness diagnosis and outcome measures. Odds ratios (ORs) or mean differences (MDs), with 95% confidence intervals (CIs), were calculated in random effects models to provide pooled effect estimates.Data SourcesMEDLINE, EMBASE, PsychINFO, and the Cochrane Library.Data SynthesisOf the 3824 publications identified by our search, 26 (including 6 129 806 unique patients) were included in our analysis. The associations between having any serious mental illness diagnosis and having any post-operative complication (ten studies, 125 624 patients; pooled effect: OR, 1.44; 95% CI, 1.15-1.79) and a longer stay in hospital (ten studies, 5 385 970 patients; MD, 2.6 days; 95% CI, 0.8-4.4 days) were statistically significant, but not those for in-hospital mortality (three studies, 42 926 patients; OR, 1.21; 95% CI, 0.69-2.12) or 30-day mortality (six studies, 83 013 patients; OR, 1.85; 95% CI, 0.86-3.99).ConclusionsHaving a serious mental illness is associated with higher rates of post-operative complications and longer stays in hospital, but not with higher in-hospital or 30-day mortality. Targeted pre-operative interventions may improve surgical outcomes for these vulnerable patients.Systematic Review RegistrationPROSPERO, CRD42018080114 (prospective).© 2021 AMPCo Pty Ltd.

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