Cardiogenic Necrotizing Enterocolitis in Infants with Congenital Heart Disease: A Systematic Review and Meta-analysis

Necrotizing enterocolitis (NEC) is a known cause of morbidity and mortality in infants with congenital heart disease (CHD), but reports about the burden of cardiogenic NEC frequently conflict. To synthesize the extant literature on the incidence, risk factors, and prognosis of NEC in patients with CHD. Medline, Cochrane, and EMBASE were searched from 1946 through 2023 for studies of NEC in infants 0-12 months of age with CHD. Risk of bias was assessed with validated tools for incidence and risk factors. Pooled estimates were meta-analyzed by risk of bias or synthesized without meta-analysis. Eighty-six studies with a total of 67,924 participants were included. The incidence of cardiogenic NEC was 7.1% (95% CI 4.7-10.5%) in term infants and 13.0% (10.2-16.5%) in low birthweight preterm infants. NEC required surgery in 0.8% (0.5-1.1%) of term and 2.7% (2.0-3.7%) of premature infants, respectively. Only gestational age and birth weight were consistently associated with risk of NEC. Restricting pooled estimates to studies of moderate or low risk of bias significantly reduced the number of studies included. Necrotizing enterocolitis is a common cause of morbidity in infants with CHD, but additional research is needed to determine which infants are at highest risk of developing NEC and would benefit most from a change in management. This systematic review and meta-analysis was conducted according to a prespecified protocol registered at the Prospective Register of Systematic Reviews (CRD42021282114).