Mortality of necrotizing enterocolitis does not vary across tertiary care children's hospitals

Abstract

ObjectiveNecrotizing enterocolitis (NEC) continues to have high surgical mortality despite progressive regionalization to children's hospitals. It is unclear whether outcomes for patients with NEC undergoing surgery vary depending on volume of these children's hospitals. This study aimed to examine the relationship between operative outcomes and a hospital's overall NEC patient volume, as well as operative volume for NEC across children's hospitals. MethodsA retrospective, cross sectional analysis was performed using the Pediatric Health Information System (PHIS). NEC patients were identified using ICD-10 codes from 2016-2021. Two hospital volume metrics were used: annual volume of NEC patients treated in the NICU, and annual volume of NEC patients undergoing surgery. Primary outcome was mortality and secondary outcome was complication. Regression models were estimated to determine the association between each volume metric and patient outcomes. ResultsA total of 1780 children who had surgery for NEC from 47 tertiary children's hospitals were included. Overall mortality rate was 23.3%. Median overall and surgical NEC patient volume per hospital were 53 [IQR 41-65] and 11 [IQR 7-16], respectively. A chi-squared test comparing mortality to volume metrics for total NEC volume, and surgical NEC volume showed no significant associations (p=0.07, p=0.74). Simple logistic regression demonstrated total NEC patient volume to have best fit with mortality outcome. ConclusionNo statistically significant association was found between the two volume metrics and discharge mortality. This lack of association suggests that the volume in these tertiary children's hospitals may be higher than the threshold for optimized outcomes. Level of EvidenceIII