• Lauren E Schlichting, Tabassum Z Insaf, Ali N Zaidi, George K Lui, and Alissa R Van Zutphen.
• Hassenfeld Child Health Innovation Institute, Brown University, Providence, Rhode Island; Bureau of Environmental and Occupational Epidemiology, New York State Department of Health, Albany, New York; University at Albany School of Public Health, Rensselaer, New York. Electronic address: Lauren_Schlichting@brown.edu.
• J. Am. Coll. Cardiol. 2019 May 7; 73 (17): 2181-2191.

BackgroundPregnant women with congenital heart defects (CHDs) may be at increased risk for adverse events during delivery.ObjectivesThis study sought to compare comorbidities and adverse cardiovascular, obstetric, and fetal events during delivery between pregnant women with and without CHDs in the United States.MethodsComorbidities and adverse delivery events in women with and without CHDs were compared in 22,881,691 deliveries identified in the 2008 to 2013 National Inpatient Sample using multivariable logistic regression. Among those with CHDs, associations by CHD severity and presence of pulmonary hypertension (PH) were examined.ResultsThere were 17,729 deliveries to women with CHDs (77.5 of 100,000 deliveries). These women had longer lengths of stay and higher total charges than women without CHDs. They had greater odds of comorbidities, including PH (adjusted odds ratio [aOR]: 193.8; 95% confidence interval [CI]: 157.7 to 238.0), congestive heart failure (aOR: 49.1; 95% CI: 37.4 to 64.3), and coronary artery disease (aOR: 31.7; 95% CI: 21.4 to 47.0). Greater odds of adverse events were observed, including heart failure (aOR: 22.6; 95% CI: 20.5 to 37.3), arrhythmias (aOR: 12.4; 95% CI: 11.0 to 14.0), thromboembolic events (aOR: 2.4; 95% CI: 2.0 to 2.9), pre-eclampsia (aOR: 1.5; 95% CI: 1.3 to 1.7), and placenta previa (aOR: 1.5; 95% CI: 1.2 to 1.8). Cesarean section, induction, and operative vaginal delivery were more common, whereas fetal distress was less common. Among adverse events in women with CHDs, PH was associated with heart failure, hypertension in pregnancy, pre-eclampsia, and pre-term delivery; there were no differences in most adverse events by CHD severity.ConclusionsPregnant women with CHDs were more likely to have comorbidities and experience adverse events during delivery. These women require additional monitoring and care.Copyright © 2019 The Authors. Published by Elsevier Inc. All rights reserved.

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