Early Versus Late Sternal Closure in Infants—Perioperative Associations and Outcomes

Abstract

Background: Delayed sternal closure (DSC) has been used for patients who develop bleeding, chest wall edema, and malignant arrhythmia following cardiopulmonary bypass. Multiple factors can influence the timing of when to perform DSC. We aimed to describe our DSC experience in neonates and infants by comparing outcomes between patients undergoing early (<48 hours) versus late DSC (> 48 hours). We explored the associations between specific clinical and laboratory variables and the timing of DSC. Methods: Retrospective chart review of neonates and infants (<one-year-old) with DSC after heart surgery from December 2012 to December 2018. Patients requiring extracorporeal membrane oxygenation were excluded. Results: A total of 121 patients were included in the analysis, 34% (n = 41) met late DSC criteria. The overall cohort had a 75% survival rate and a median time for open sternum of 42.5 hours (Q1:23-Q3:65). The median time for open sternum in the early and late DSC groups was 24 hours (Q1:21-Q3:43) and 93 hours (Q1:65-Q3:141), respectively ( P < .01). There was no statistical difference in mortality rate between groups. Patients with late DSC endured longer intensive care unit stays (median 24.3 days [Q1:13-Q3:35.3] vs 36.8 [Q1:23.9, 73.6]; P< .01) and a two-fold longer hospital stay compared to the early DSC group (multivariable analysis: relative risk = 2, 95% CI: 1.5-2.7; P < .01). Univariate analysis revealed patients with late DSC had higher median lactates both intraoperatively (7.6 [Q1:5.9-Q3:10.7] vs 9.3 [Q1:7.5-Q3:12.1]; P < .01) and 24 hours postoperatively (6.5 [Q1:4.3-Q3:10.3] vs 8.7 [Q1:5.7-Q3:14.70]; P = .03). A higher vasoactive inotrope score at 36 hours was associated with late DSC (odds ratio = 1.1, 95% CI: 1.01-1.2; P = .02). Conclusions: Future research that explores additional clinical and laboratory variables that can help guide DSC decision-making and timing is needed.