Commentary - Journal of Physical Medicine and Rehabilitation (2022) Volume 4, Issue 1
Commentary on Association between Birth Weight and Risk of Cardiovascular Disease: Evidence from UK Biobank
Jingjia Liang1,2, Aihua Gu1,2,*
1State Key Laboratory of Reproductive Medicine, School of Public Health, Nanjing Medical University, Nanjing, China
2Key Laboratory of Modern Toxicology of Ministry of Education, Center for Global Health, Nanjing Medical University,
- *Corresponding Author:
- Aihua Gu
Received date: July 01, 2022; Accepted date: July 13, 2022
Citation: Liang J, Gu1 A. Commentary on Association between Birth Weight and Risk of Cardiovascular Disease: Evidence from UK
Biobank. J Phys Med Rehabil. 2022;4(1):25-27.
Copyright: © 2022 Liang J, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Cardiovascular disease (CVD) is one of the major causes of death worldwide. The risk of CVD in adulthood is influenced not only by genetic and adult lifestyle factors, but also by early environmental factors. Low birth weight is a marker of intrauterine stress and is associated with susceptibility to CVD. This commentary discussed the role of various causes of birth weight changes, such as preterm birth, intrauterine growth restriction, and multiple births, in increasing susceptibility to cardiovascular disease in adults. Early identification of individuals at risk of cardiovascular disease is critical for developing effective preventions.
Cardiovascular disease, Birth weight, Preterm birth, Intrauterine growth restriction, Multiple births
Cardiovascular disease (CVD) is one of the major causes of death worldwide and poses a huge public health burden [1,2]. Early identification of individuals at risk of cardiovascular disease is crucial to develop effective preventions. The DOHAD hypothesis proposed by Professor Barker et al. states that an abnormal environment early in life can alter an individual’s organ structure, biochemistry, genetics and/or physiology, thereby increasing the risk of diseases later in life, namely that cardiovascular disease can be programmed in early life [3,4].
In our study, the association between birth weight and adult CVD was observed by Cox regression using recall of birth weight data from a large UKB cohort . There was a J-shaped correlation between birth weight and CVD, in which low birth weight was strongly correlated with the occurrence of CVD, and macrosomia (high birth weight) also had a certain increase in the risk of CVD, notably coronary heart disease. we redefined a more precise birth weight range with a lower risk of CVD, based on the WHO standard birth weight range. This provides a clear target for the prenatal and perinatal care of children in the future.
Consistent with our study, a previous meta-analysis showed that a U-shaped non-linear relationship between birth weight and overall CVD and its subtypes . Birth weight lower than ~2500 g and higher than ~4000 g had a positive effect on CVD risk. Furthermore, low birth weight was found to be directly associated with CVD subtype, e.g. coronary heart disease (CHD) and stroke. However, the dose-response relationship described in the meta-analysis was based on classification data of birth weight, which might affect the correlation compared to the direct analysis of continuous variables. The high heterogeneity between studies could not be avoided even after subgroup analysis. In our study, the large sample data of UK Biobank can effectively avoid such bias caused by insufficient sample size in the analysis.
Birth weight is an intuitive reflection of the overall condition of the baby during pregnancy, which can approximately judge the living environment and nutritional status of the baby in utero [7-10]. Our study focused on the association between birth weight and the risk of CVD, but reckoned without the effect of other prenatal factors on CVD, such as premature birth and intrauterine malnutrition, because of the lack of prenatal factors in UK Biobank. It is necessary to further subdivide the low birth weight caused by different causes, so that it may be easier to find the important factors causing low birth weight and its important influence on cardiovascular disease. This will provide the basis for clearer guarantees of health care during pregnancy and the perinatal period.
The current study also found that preterm birth is associated with an increased risk of lipid disorders in early to middle adulthood . In addition, preterm birth was found to be a predictor of CVD risk in young women before they developed identified CVD risk factors . In premature infants, gestational age was negatively correlated with school-age systolic blood pressure [12,13]. In other words, preterm infants were smaller but had higher systolic blood pressure at school age. However, blood pressure is affected by many factors, including age , weight , socioeconomic status [16, 17] etc. Further studies are needed to clarify the exact mechanism of preterm birth and the risk of elevated blood pressure in adulthood. Moreover, a recent study reported that preterm birth was associated with greater total fat mass, suggesting that preterm birth may affect cholesterol metabolism . Thus, preterm birth may be one of the major gestational factors causing low birth weight and may contribute to an increased risk of cardiovascular disease.
The population study in Preston and Sheffield focused on examining birth records such as physical measurements taken at birth . Among men born in Sheffield, those who were younger at term showed an increased incidence of risk factors for CHD, suggesting that low birth weight from other causes in addition to preterm birth is associated with cardiovascular disease in adulthood. Fetal intrauterine growth restriction (IUGR) is defined as occurring when fetal weight is below the 10th percentile of gestational age . IUGR is associated with nutrition during pregnancy , multiple birth [22,23], maternal cardiovascular disease , placental insufficiency , drug abuse , smoking during pregnancy [27,28]. Clinical study showed a link between maternal malnutrition, low birth weight and the incidence of CVD . It has been suggested that postpartum catch-up growth plays an important role in the increasing incidence of CVD due to adaptation to the adverse environment in utero . Children with a history of IUGR generally have a lower growth rate and a smaller body size around puberty compared to healthy infants born at term with adequate birth weight, although catch-up growth occurs in the first years of life . The association between the occurrence of advanced metabolic diseases and cardiovascular diseases and IUGR may be related to the low inflammatory manifestations . It has proved that IUGR may induce significant metabolic and inflammatory abnormalities, which increases the risk of obesity and cardiovascular disease later in life . Together, low birth weight caused by IUGR may be one of the important causes of cardiovascular disease in adulthood.
According to Barker’s hypothesis, adverse outcomes for
twins are expected because their birth weight is usually lower than that of single birth. However, twin studies have been
inconclusive in terms of increased incidence of adult disease.
de Boo and Harding  compared adult twins to singleton
siblings or other singleton births. They found no difference
in CHD blood pressure or death rates between multiple and
single births. The relationship between low birth weight and
the development of advanced disease in twins and singleton
cases may differ , as it has been suggested that the
intrauterine environment of twins and singleton cases is also
Longer follow-up periods and better information collection systems during pregnancy are necessary so as to determine the impact of low birth weight caused by different prenatal factors, such as preterm birth, IUGR and multiple births, on cardiovascular risk factors and cardiovascular disease risk.
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