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Preterm birth and future maternal blood pressure, inflammation, and intimal-medial thickness: the CARDIA study
Janet M Catov1, Cora E Lewis, Minjae Lee
1Department of Obstetrics, Gynecology and Reproductive Sciences, University of Pittsburgh School of Medicine, Pittsburgh, PA 15213, USA. catovjm@upmc.edu
Insights
Preterm birth (PTB) is linked to higher blood pressure in women years after pregnancy, even without pregnancy hypertension. This finding is crucial for cardiovascular disease risk assessment in women with a history of PTB.
Area of Science:
- Cardiovascular Disease Epidemiology
- Reproductive Health and Cardiovascular Outcomes
- Inflammatory Markers and Cardiovascular Risk
Background:
- Preterm birth (<37 weeks) may indicate endothelial dysfunction and inflammation, both established cardiovascular disease (CVD) risk factors.
- Understanding the long-term cardiovascular implications of preterm birth is essential for preventative health strategies, particularly in diverse populations.
Purpose of the Study:
- To investigate the association between preterm birth (PTB) and long-term cardiovascular risk factors, including blood pressure, inflammatory markers, and subclinical atherosclerosis.
- To evaluate differences in cardiovascular risk profiles between women with and without a history of preterm birth over a 20-year follow-up period.
Main Methods:
- Longitudinal study of 916 women, tracking live births and cardiovascular risk factors over 20 years.
- Measurements included blood pressure, lipids, C-reactive protein (CRP), interleukin-6 (IL-6), and carotid intima-media thickness (CIMT).
- Statistical analyses compared outcomes based on the occurrence of preterm birth versus term birth.
Main Results:
- Women with preterm births had higher pre-pregnancy systolic blood pressure and experienced a more rapid increase in both systolic and diastolic blood pressure over 20 years.
- Carotid intima-media thickness, C-reactive protein, and interleukin-6 levels did not significantly differ between women with preterm births and those with term births.
- Higher post-pregnancy blood pressure was observed in women with preterm births, irrespective of pregnancy-induced hypertension.
Conclusions:
- Preterm birth is associated with persistently higher blood pressure in the years following pregnancy, highlighting a potential long-term cardiovascular risk.
- PTB may serve as an early indicator for identifying women at increased risk of hypertension and subsequent cardiovascular disease.
- These findings are particularly relevant in the US context, given high PTB rates and persistent racial disparities in maternal and child health outcomes.
Abstract:
Preterm birth (PTB, <37 weeks) may be a marker of endothelial dysfunction and a proinflammatory phenotype; both are risk factors for cardiovascular disease. We studied 916 women (46% black) with 1181 live births between enrollment in the Coronary Artery Risk Development in Young Adults study (age 18-30 years) and 20 years later. C-reactive protein was measured at years 7, 15, and 20. Interleukin-6 and carotid intima-media thickness, which incorporated the common carotid arteries, bifurcations, and internal carotid arteries, were measured at year 20. Blood pressure, lipids, anthropometrics, and pregnancy events were assessed at all visits. Change in risk factors and differences in inflammatory markers and intima-media thickness according to PTB were evaluated. Women with PTBs (n=226) had higher mean systolic blood pressures before pregnancy (106 versus 105 mm Hg, respectively; P=0.03). Systolic and diastolic blood pressure increased more rapidly over 20 years compared with women with term births (P<0.01 time interaction), even after removing women with self-reported hypertension in pregnancy. Women with PTB versus term births had similar mean intima-media thickness adjusted for age, body mass index, race, lifestyle, and cardiovascular risk factors. C-reactive protein and interleukin-6 did not differ according to PTB. Women with PTB, regardless of hypertension during pregnancy, had higher blood pressure after pregnancy compared with women with term births. In the United States, where rates of PTB are high and race disparities persist, PTB may identify women with higher blood pressure in the years after pregnancy.
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