Abstract 17339: Maternal Predictors of Disparate Outcomes in Children With Single Ventricle Congenital Heart Disease

Introduction: Significant variability in morbidity and mortality persists for children with single ventricle congenital heart disease (SV-CHD) despite standardization in medical and surgical care. Multiple risk factors for poor outcomes have been described, but they only explain a fraction of the disparity in outcomes. The Developmental Origins of Health and Disease (DOHaD) theory proposes that fetal adaptation to an adverse in utero environment alters the ability to respond to post-natal stressors and may explain additional risk for poor outcomes. This study assessed maternal risk factor association with disparate outcomes following SV palliation. Hypothesis: Maternal factors related to weight, diabetes, hypertension, and smoking may be associated with an increased risk of poor outcomes in children with SV-CHD. Methods: This retrospective observational cohort study included all term maternal-infant pairs with a diagnosis of SV-CHD who underwent surgical palliation from 2006-2015 at Primary Children’s Hospital. Pairs lacking maternal variables of interest or infant follow-up data up to 1 year were excluded. The association of death or transplant with maternal risk factors [abnormal pre-pregnancy BMI, abnormal weight gain during pregnancy (≤ 7 kg or ≥ 20 kg), any type of hypertension or diabetes and smoking] was analyzed using a multivariable logistic regression model. Results: Of 190 infants who qualified, 135 (71%) maternal-infant dyads had complete data for inclusion. Systemic right ventricular morphology was present in 69% and 31% had systemic left ventricular morphology. Death or transplant occurred in 48 infants (36%) during an average follow-up of 2.2 years (0.1-11.7 years). Abnormal weight gain during pregnancy was present in 34 (25%) mothers, of which 24 had excessive (>20 kg) and 10 had inadequate (<7 kg) weight gain. Prevalence of other risk factors was 53% with an abnormal pre-pregnancy BMI, 10% for diabetes, 6% for hypertension and 8% for smoking. Abnormal weight gain during pregnancy was associated with an increased risk of death or transplant in offspring with SV-CHD. (OR=2.55, 95%CI:1.11-5.84, p=0.027). Conclusions: Abnormal maternal weight gain (excessive or inadequate) during pregnancy is a novel risk factor that may contribute to worse outcomes in SV-CHD.