Small size in early pregnancy linked to poor heart health later in life

Poor growth in the first three months of pregnancy is associated with a range of cardiovascular risk factors in childhood, finds a study published in BMJ today.

The findings add to a growing body of evidence and suggest that the first trimester of pregnancy may be a critical period for in later life.

The first trimester of pregnancy includes the 'embryonic phase' (a period of rapid development when the heart and other major organs start to form). So a team of researchers in the Netherlands decided to examine whether poor growth during this period is associated with cardiovascular risk in childhood.

The study involved 1,184 school age children with first trimester crown to rump length measurements (commonly used to estimate fetal age) whose mothers had a known first day of their last menstrual period and a regular cycle.

Several factors, such as mothers' age, ethnicity, education, smoking status, body mass index and blood pressure were also recorded.

At around age six, children were assessed for factors, including , , blood pressure, cholesterol levels and insulin concentrations.

Using first trimester crown to rump length, the researchers split the group of fetuses into fifths. Compared with those in the highest fifth, those in the lowest fifth (the smallest fetuses) had, at age 6, significantly more total fat mass and android fat mass (fat stored around the abdomen), higher diastolic and an adverse cholesterol profile.

First trimester growth restriction was also associated with an increased risk of clustering of these in childhood.

The authors acknowledge that some of their associations may have arisen by chance, but suggest that the first trimester might be a critical period for cardiovascular and metabolic function.

"Further studies are needed to identify the underlying causal biological mechanisms and long term consequences," they add. Future strategies to improve cardiovascular health "may start from early pregnancy onwards or even before conception," they conclude.

In an accompanying editorial, Professor Gordon Smith and Catherine Aiken from the University of Cambridge say despite some limitations, this study adds to a growing body of evidence that is associated with an increased risk of cardiovascular – and many other – diseases in later life.

But they add "we need a deeper understanding of the strength, nature and mechanisms of the reported associations before rushing to intervene."

More information: First trimester growth restriction and cardiovascular risk factors in school age children: population based cohort study, BMJ, 2014.

Editorial: Early fetal growth and risk factors for cardiovascular disease, BMJ, 2014.

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