Abstract Body (Do not enter title and authors here): Background
Neonates born to women with congenital heart disease (CHD) are at high risk for adverse outcomes. We sought to describe these outcomes and maternal/pregnancy risk factors.

Methods
We analyzed linked clinical, administrative, and birth certificate data in 3 geographic areas in Georgia, North Carolina and Utah from 2011 through 2014. Birth certificates provided neonatal, maternal and pregnancy characteristics. Maternal CHD was identified from linked clinical and administrative data and categorized as severe, shunt, valve, or shunt+valve. Neonatal outcomes of interest included preterm delivery (<37 wk), low birth weight (<2500 g) (LBW), small for gestational age (SGA), neonatal intensive care unit admission (NICU), a composite “any poor outcome” (one or more of preterm, SGA, or NICU), and CHD. Neonatal outcomes were summarized using descriptive statistics. Differences by maternal CHD severity were assessed using Kruskal-Wallis and Chi-square tests for continuous and categorical variables, respectively. Association of maternal/pregnancy characteristics and neonatal outcomes were assessed using generalized estimating equations with logit link function clustered on mother and adjusted for mother’s age, birth year, and state.

Results
We identified 2,422 liveborn neonates (median gestational age 38 wks, weight 3155 g) born to 1,987 women with CHD (34% severe, 32% non-White, median age 28yrs). Overall, 19% were preterm, 18% LBW and 14% SGA; 25% required NICU and 40% experienced the composite adverse outcome (preterm, SGA, and/or NICU). CHD was present in 4.2%. Infants born to mothers with severe CHD (vs. combined non-severe) were more likely to have an adverse composite outcome [aOR 2.1 (1.7, 2.5)] and CHD [aOR 17.1 (9.3, 31.5)]. Black race [vs. White, aOR 1.8 (1.4, 2.3)], pregestational diabetes (DM) [vs. no, aOR 2.5 (1.3, 5.0)], gestational hypertension (GHTN) [vs. no, aOR 2.1 (1.5, 3.1)], prior preterm birth [vs. no, aOR 2.0 (1.3, 3.1)] and multiples [vs. singleton, aOR 6.7 (3.8, 11.6)] were associated with increased risk of composite adverse outcome.

Conclusions
Forty percent of neonates born to women with CHD experienced an adverse neonatal outcome. Risk increased with maternal CHD severity, Black race, GHTN, DM, prior preterm birth, and multiple pregnancy. These findings highlight the need for heightened awareness and surveillance of these risk factors and expert preconception and pregnancy counseling for woman with CHD.