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Maternal and fetal influences on blood pressure
C M Law1, D J Barker, A R Bull
1Medical Research Council, University of Southhampton.
Insights
Childhood blood pressure is influenced by fetal growth factors like birth weight and placental size. Maternal factors, such as low hemoglobin levels during pregnancy, also impact a child's blood pressure, suggesting potential for early hypertension prevention.
Area of Science:
- Pediatrics
- Obstetrics
- Cardiovascular Health
Background:
- Childhood blood pressure is a predictor of adult hypertension.
- Intrauterine factors may influence long-term cardiovascular health.
- Understanding fetal growth patterns is crucial for identifying hypertension risks.
Purpose of the Study:
- To investigate maternal and fetal determinants of blood pressure in 4-year-old children.
- To correlate birth measurements and maternal health with childhood systolic pressure.
- To explore potential for primary prevention of hypertension through intrauterine interventions.
Main Methods:
- Home visits for blood pressure and growth measurements in 405 children aged 4 years.
- Abstraction of pregnancy, delivery, and infant data from obstetric records.
- Statistical analysis correlating fetal growth parameters and maternal hemoglobin with child's blood pressure.
Main Results:
- Child's systolic pressure inversely correlated with birth weight and positively with placental weight.
- Lower head circumference-to-length ratio and ponderal index at birth were associated with higher systolic pressure.
- Children of mothers with hemoglobin <100g/l during pregnancy had significantly higher systolic pressures.
Conclusions:
- Fetal growth patterns associated with adult hypertension are also linked to higher blood pressure in young children.
- Maternal hemoglobin levels during pregnancy are a significant factor in childhood blood pressure.
- Identifying and modifying intrauterine influences on fetal growth may offer a pathway for primary hypertension prevention.
Abstract:
To study maternal and fetal influences on blood pressure in childhood 405 children aged 4 years who were born and still resident in the Salisbury health district were visited at home for blood pressure and growth measurements. Information on the pregnancy, delivery, and baby was abstracted from the routine obstetric notes. Similar to recent findings in adults, the child's systolic pressure was inversely related to birth weight and positively related to placental weight. Systolic pressure at 4 years increased by 1.2 mm Hg for every SD decrease in the ratio of head circumference to length at birth, and by 1.1 mm Hg for every SD decrease in ponderal index at birth. Mothers whose haemoglobin concentrations fell below 100g/l during pregnancy had children whose systolic pressures were on average 2.9 mm Hg higher than the children of mothers with higher haemoglobin concentrations. Patterns of placental weight, birth weight, head circumference, and length that are associated with high blood pressure in adults are also associated with higher blood pressure in 4 year old children. Identification of the intrauterine influences that lead to these patterns of fetal growth could lead to the primary prevention of hypertension.