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Women with chronic hypertension (high blood pressure before pregnancy or diagnosed before 20 weeks of pregnancy) had a 30% higher risk of having a baby with critical congenital heart disease, the most severe form of heart defects, when compared to women with normal blood pressure before and during pregnancy, according to new independent, preliminary research presented at the American Heart Association's Scientific Sessions 2026, held Nov. 6–9 in Chicago.

High blood pressure during pregnancy is defined as systolic blood pressure (the top number) of 140 mm Hg or higher and diastolic blood pressure (the bottom number) of 90 mm Hg or higher. According to the American Heart Association/American College of Cardiology 2025 High Blood Pressure Guideline, high blood pressure affects approximately 16% of pregnancies. It is a leading cause of serious health complications and death for both pregnant individuals and their infants worldwide.

Types of high blood pressure in pregnancy that were included in this study were chronic (preexisting before pregnancy or diagnosed prior to 20 weeks of pregnancy); gestational (diagnosed at 20 weeks of pregnancy or later); chronic with gestational (high blood pressure before or during the first 20 weeks of pregnancy that continues to rise and/or leads to complications); and eclampsia (severe hypertension diagnosed after 20 weeks of pregnancy that includes seizures and other complications and requires emergency treatment).

This study explored maternal health factors to evaluate the potential association between high blood pressure-related disorders during pregnancy and the risk of critical congenital heart disease (CCHD), the most severe type of congenital heart disease, also called congenital heart defects.

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