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Birth weight as a predictor of future hypertension
1Department of Medicine, Thomas Jefferson University, Philadelphia, Pennsylvania, USA. bonita.falkner@mail.tju.edu
Insights
Fetal programming suggests poor intrauterine growth can lead to later-life hypertension. Lower birth weight is consistently linked to higher blood pressure, with each kilogram increase associated with a 1-2 mm Hg systolic pressure decrease.
Area of Science:
- Developmental biology
- Cardiovascular health
- Epidemiology
Background:
- The concept of fetal programming posits that adverse intrauterine conditions can predispose individuals to chronic diseases later in life.
- Hypertension development is a significant concern, and understanding its causal pathways is crucial for public health.
- The intrauterine environment's impact on fetal growth offers a potential mechanistic link to later-life disease.
Purpose of the Study:
- To explore the mechanistic pathway linking intrauterine environment, fetal growth, and hypertension development.
- To review experimental and epidemiological evidence supporting the fetal programming concept for hypertension.
- To assess the relationship between birth weight and blood pressure in human populations.
Main Methods:
- Review of experimental studies in animal models demonstrating fetal undernutrition and subsequent hypertension.
- Analysis of epidemiological data investigating the association between birth weight and blood pressure in humans.
- Examination of the consistency and magnitude of the relationship between birth weight and systolic blood pressure.
Main Results:
- Experimental studies in animal models provide support for the fetal programming of hypertension through growth restriction.
- Human epidemiological evidence shows a small but consistent inverse relationship between birth weight and blood pressure.
- Each kilogram increase in birth weight is associated with a 1-2 mm Hg reduction in systolic blood pressure.
Conclusions:
- Intrauterine growth restriction is a plausible programming factor for hypertension.
- While animal models offer strong support, human epidemiological data, though consistent, indicates a modest effect size.
- Further research is needed to fully elucidate the complex interplay between fetal development and long-term cardiovascular health.
Abstract:
According to the concept of "fetal programming," intrauterine conditions that impair fetal growth can program the fetus to express hypertension, as well as other chronic diseases, in later life. A model for the development of hypertension that includes the effect of the intrauterine environment on fetal growth as a mechanistic pathway contributes a new dimension in causality and is of great interest. Experimental studies that apply maneuvers to impose fetal undernutrition in animal models have developed data that support this concept. The evidence developed from epidemiologic investigations on humans is less conclusive. Overall, there tends to be a small but consistent relationship of lower birth weight with higher blood pressure (BP). For each kilogram increase in birth weight, the systolic BP is 1 to 2 mm Hg lower.