摘要Background The burden of perioperative complications following pediatric surgery in sub-Saharan Africa is high.Assessment of the patterns and determinants of such complications and their relationship to perioperative mortality are important in identifying indicators of poor outcomes.In this study,we aim to define predictors of perioperative mortality at a tertiary hospital in Nigeria.Methods This was a retrospective review of medical records between January 2014 and December 2023.We included patients aged 15 years and below,who had general pediatric,oncological or urological surgery under general anesthesia.Information extracted included biodata,diagnosis,American Society of Anesthesiology(ASA)classification of physical status,time of death after surgery,cause of death,and duration of surgery.Data were processed using univariate and multivariate statistical analysis.Results A total of 1621 patients were analyzed.The 30-day perioperative mortality rate was 2.96％(296 per 10000 patients).Jejuno-ileal atresia,gastrochisis,and bladder exstrophy were associated with the highest mortality rates,well above 50％.Logistic regression identified neonatal age,ASA class greater than Ⅱ,prolonged surgery,and repeated surgical procedures as significant predictors of mortality.Sepsis and intestinal or anastomotic failure were identified as the most common direct causes of death.Conclusions Neonatal age,ASA class greater than Ⅱ and prolonged and repeated surgery are significant predictors of mortality in children's surgery in our practice.Efforts should be made to combat sepsis and provide physiologic support and intensive care provision to improve outcomes.