A retrospective review of pregnancy outcomes in women with uncomplicated mild to moderate chronic hypertension.

Objective: To examine pregnancy complications in women with uncomplicated mild-moderate chronic hypertension (CHTN) treated with antihypertensives prior to 20 weeks compared to those not on antihypertensives.

Study Design: This retrospective cohort study examined singleton pregnancies of women with mild-moderate CHTN who delivered from 01/2014-3/2019. Pregnancies complicated by hypertension at ≥ 20 weeks, end organ damage, preexisting diabetes mellitus, early-onset gestational diabetes, multifetal gestation, and fetal anomalies were excluded. Adjusted logistic regression analyses were performed for each of the outcomes. Adjusted odds ratios (aOR) were reported along with associated 95% confidence intervals (CI) and p-values.

Main Outcome Measures: Primary outcome was superimposed preeclampsia severe features. Additional maternal outcomes were superimposed preeclampsia severe features, severe hypertension, indicated preterm delivery, placental abruption, and mode of delivery. Neonatal outcomes included composite perinatal outcomes (fetal growth restriction, intrauterine fetal demise, and small for gestational age neonate), low birth weight, very low birth weight, admission to the neonatal intensive care unit, and Apgar score <7 at 5-minutes.

Results: 345 women were identified: 232 (67.2%) were not taking antihypertensives and 113 (32.8%) were taking ≥1 antihypertensive. There was no significant difference in the primary outcome ( = 0.65; aOR = 0.88; 95% CI 0.51-1.52) among the group taking antihypertensive therapy as compared to those not taking antihypertensives. No statistically significant differences were seen for any of the other secondary maternal or neonatal outcomes.

Conclusions: Our data supports that the use of antihypertensive therapy in women with mild-moderate CHTN does not reduce the risk of developing superimposed preeclampsia.