Postoperative gastrointestinal (GI) bleeding is an uncommon but serious complication following pediatric cardiac bypass surgery. In this retrospective cross-sectional study using the National Inpatient Sample (2016–2020), investigators analyzed 24,275 weighted pediatric cases (0–18 years) undergoing cardiac bypass procedures identified via ICD-10-PCS codes. Postoperative GI bleeding was defined using ICD-10-CM diagnosis codes. The study was published in the Annals of Pediatric Cardiology. 

Among these cases, 110 (0.45%) experienced postoperative GI bleeding. Multivariable logistic regression identified cardiac surgery (OR 5.7; 95% CI 3.75–8.69; P<0.001), larger hospital bed size, and teaching hospital status as significant predictors. Calendar year and hospital region were also associated with bleeding risk, with 95.5% of cases occurring in specific regional contexts.Mortality was markedly higher among patients with GI bleeding compared with those without bleeding (36.4% vs 0.3%; P<0.001).

Limitations include reliance on administrative coding, potential misclassification, absence of granular clinical details, and inability to adjust for unmeasured confounders. The cross-sectional design precludes causal inference.

Postoperative GI bleeding occurred in 0.45% of pediatric cardiac bypass cases and was associated with substantially higher mortality. Further investigation into mechanisms and preventive strategies is warranted.