Objective
Maternal chronic hypertension has been associated with various adverse pregnancy and neonatal outcomes, including superimposed preeclampsia and preterm labor, both linked to adverse short- and long-term outcomes. However, most studies investigating offspring long-term outcomes did not isolate chronic hypertension from other hypertensive disorders. Hence, we decided to explore a possible association between maternal chronic hypertension and long-term respiratory morbidity in offspring.
Study design
This population-based cohort included all singleton deliveries from 1991 to 2021 at a tertiary medical center. Offspring of mothers with chronic hypertension were compared to those of normotensive pregnancies. Offspring long-term respiratory morbidity, up to the age of 18 years, was compared using diagnoses from community and hospital records. Kaplan–Meier survival analysis was used to compare the cumulative incidence and a GEE model adjusted for potential confounders.
Results
A total of 342,365 singleton deliveries occurred, of which 3,097 (0.9 %) were to mothers with chronic hypertension. Respiratory morbidity rate of children who were exposed in-utero to maternal chronic hypertension was significantly higher than children from pregnancies that were uncomplicated by hypertensive disorders (p < 0.001). However, cumulative respiratory morbidity was comparable between the groups (Kaplan-Meier Log-rank test p = 0.06). In the GEE model adjusted for maternal age, gestational age, low birthweight, cesarean delivery, fertility treatments, pre-gestational diabetes, smoking, obesity, ethnicity, and child birth year was not independently associated with offspring respiratory morbidity (adjusted HR (aHR) 1.09, 95 % CI 0.74–1.59, p = 0.662)
Conclusion
In our cohort, maternal chronic hypertension is not an independent risk factor for offspring long-term respiratory morbidity.
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