Abstract 16873: Association of Preoperative Cell-Free DNA Levels and Outcome Following Pediatric Cardiopulmonary Bypass

Abstract

Introduction: Preoperative risk stratification in congenital cardiac surgery includes patient and procedure related factors, which may be used in clinical decision making as well program performance evaluation. Despite these tools, unidentified factors contribute to wide variation in outcomes both within and between centers. Identification of latent physiologic risk factors may strengthen predictive models. Hypothesis: Total cell-free DNA (TCF) functions as a biomarker for cellular injury as well as a pro-inflammatory cytokine. We hypothesized that elevated preoperative TCF would be associated with poor outcome following pediatric cardiac surgery requiring cardiopulmonary bypass (CPB). Methods: Prospective observational study of children age < 18 yr and wt > 3 kg undergoing planned CPB surgery. The Children’s Wisconsin Institutional Review Board approved the protocol . A serum TCF sample was obtained after induction of anesthesia prior to surgical incision. The primary outcome measure was a composite of postoperative cardiac arrest, ECMO, or death (CAED). Association of outcome to TCF was assessed by logistic regression with a cutpoint chosen by ROC curve exploration. Odds ratios with 95% CI were calculated. Results: Data were available in 117 patients, median age 0.9 years (range 0-17.4), median weight 7.8kg (range 3.2-98). The primary outcome (CAED) was met in 6/117 (5.1%). Table 1 summarizes characteristics of patients with and without CAED. Risk of CAED was 2% with TCF<20 ng/ml, and 27% with TCF>20 ng/ml (OR=18.2, CI 2.2- 212, p<0.01). Elevated TCF was associated to fewer hospital free days (GLM p<0.01). Data in table reported as median [IQR]. Conclusions: Preoperative TCF has an important association with postoperative cardiac arrest, ECMO, and death. Alternative or intensified treatment strategies could be considered in patients with elevated preoperative TCF.