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According to an analysis by researchers at the National Institutes of Health, hypertension before conception may increase the risk of pregnancy loss.The analysis found that for every 10 mmHg increase in diastolic blood pressure-when the heart is resting between beats, there was an 18-percent-higher risk for pregnancy loss among the study participants. Keeping blood pressure under control could reduce the risk.
Researchers analyzed data collected as part of the Effects of Aspirin in Gestation and Reproduction (EAGeR) trial, which sought to determine if daily low-dose aspirin (81 milligrams) could prevent miscarriage in women who had a history of pregnancy loss. The EAGeR trial enrolled more than 1,200 women ages 18 to 40 years and took blood pressure readings before the women were pregnant and in the fourth week of pregnancy.
Average diastolic blood pressure for the women in the study was 72.5 mmHg; normal blood pressure in adults is a diastolic reading of below 80 mmHg. They discovered increase in pregnancy loss among women who had a diastolic reading above 80 mmHg. None of the women in the study had stage II high blood pressure-above 90 mmHg in systolic high blood pressure or above 140 mmHg in systolic blood pressure. After considering maternal age, higher body mass index or smoking, the relationship between preconception blood pressure and pregnancy loss remained the same.
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