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Published on: September 5, 2011
Placental Pathology and Blood Pressure at Age 7: A Longitudinal Discordant Twin Analysis
Alexa A Freedman1,2, Gregory E Miller3,4, Andrew D Franklin5
1Department of Obstetrics and Gynecology, Endeavor Health, Evanston, IL (A.A.F.).
Insights
Placental maternal vascular malperfusion (MVM) is linked to higher offspring blood pressure in childhood. This study used twin and sibling designs to show placental pathology impacts cardiovascular health, independent of shared family factors.
Area of Science:
- Obstetrics and Gynecology
- Pediatrics
- Cardiovascular Disease Research
Background:
- The intrauterine environment significantly influences offspring cardiovascular disease (CVD) risk.
- Placental dysfunction is a potential pathway, but confounding factors complicate observational studies.
- Twin and sibling designs can mitigate confounding to isolate placental effects.
Purpose of the Study:
- To investigate the association between placental pathology and offspring blood pressure at age 7.
- To utilize twin and sibling comparison designs to control for genetic and environmental confounders.
- To determine if placental lesions, specifically maternal vascular malperfusion (MVM), are linked to later blood pressure.
Main Methods:
- Analysis of data from the Collaborative Perinatal Project (1959-1965).
- Systematic examination of placentas for MVM and acute inflammation post-delivery.
- Blood pressure assessment in offspring at age 7.
- Linear fixed-effects models applied to discordant twin/sibling pairs.
Main Results:
- A twin with high-grade MVM showed higher systolic blood pressure Z-scores (0.56 SDs) compared to their co-twin without MVM.
- This association persisted in sensitivity analyses of dichorionic twins and sibling pairs.
- Acute placental inflammation was not significantly associated with offspring blood pressure.
Conclusions:
- Maternal vascular malperfusion (MVM) in the placenta is associated with elevated offspring blood pressure in mid-childhood.
- These findings highlight the placenta's role in the developmental origins of cardiovascular health.
- The results are independent of shared parental and pregnancy characteristics in twin pairs.
Background:
Evidence suggests that the intrauterine environment shapes offspring cardiovascular disease risk. Although placental dysfunction may be an important pathophysiologic pathway, numerous parental and pregnancy characteristics that influence offspring blood pressure are strong confounders of the mechanistic role of the placenta in observational analyses of singletons. Therefore, we leverage twin- and sibling-based comparison designs to determine whether placental pathology is associated with offspring blood pressure at age 7 while mitigating major sources of confounding.
Methods:
Data are from pregnant participants and their offspring in the Collaborative Perinatal Project, a longitudinal pregnancy cohort conducted from 1959 to 1965 in the United States. After delivery, placentas were systematically examined for lesions indicative of maternal vascular malperfusion (MVM) and acute inflammation. Blood pressure was assessed at a follow-up research visit when the offspring were 7 years old. Linear fixed-effects models were used to estimate associations between within-twin or sibling discordance in placental pathology and differences in blood pressure at age 7.
Results:
Overall, 193 twin pairs were eligible for inclusion, and 23.3% had placentas discordant for MVM. In a fixed-effect analysis, a twin with high-grade MVM had a higher systolic blood pressure Z score by 0.56 SDs than their co-twin without MVM (95% CI, 0.06-1.05) or a 5.7-mm Hg difference (95% CI, 0.6-10.8). Associations were consistent in a sensitivity analysis restricted to dichorionic twins and in a secondary analysis of 759 MVM-discordant sibling pairs. Acute placental inflammation was not associated with blood pressure at age 7.
Conclusions:
MVM in the placenta is associated with higher offspring blood pressure in mid-childhood, independent of parental and pregnancy characteristics that twins have in common. The findings support the role of the placenta and the intrauterine environment in the developmental origins of cardiovascular health.
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