Safety of surgery: quality assessment of meta-analyses on the WHO checklist

To assess the quality of the meta-analyses that review the WHO surgical safety checklist. A systematic review of meta-analysis studies was undertaken using the search terms "World Health Organization Surgical Safety Checklist" in PubMed, Embase, and Lilacs databases. The selected meta-analyses were rated using the AMSTAR 2 assessment tool. In the three meta-analyses evaluated, the checklist was associated with a decrease in the rates of complications and mortality. Overall confidence in the results of the evaluated meta-analysis was critically low. The meta-analysis coincides with obtaining lower complications and mortality rates with the WHO surgical safety checklist. However, the studies included in the meta-analyses were mostly observational, with potential biases, and according to the AMSTAR 2 tool, the overall confidence in the results of the evaluated studies was critically low.