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(Patho)physiological implications of chronic dietary sodium restriction during pregnancy; a longitudinal prospective
E A Steegers1, H P Van Lakwijk, H W Jongsma
1Department of Obstetrics and Gynaecology, Catholic University of Nijmegen, Sint Radboud Hospital, The Netherlands.
British Journal of Obstetrics and Gynaecology
|October 1, 1991
Summary
Long-term dietary sodium restriction in pregnancy led to lower maternal weight gain and reduced circulating blood volume. However, it did not significantly impact blood pressure or birth weight.
Area of Science:
- Obstetrics and Gynaecology
- Maternal-Fetal Medicine
- Nutritional Science
Background:
- Dietary sodium intake is a critical factor in maternal health during pregnancy.
- Understanding the long-term effects of sodium restriction is essential for prenatal care guidelines.
Purpose of the Study:
- To investigate the pathophysiological consequences of sustained dietary sodium restriction during pregnancy.
- To compare the effects of a low-sodium diet versus an unrestricted sodium diet on maternal and fetal outcomes.
Main Methods:
- A longitudinal prospective randomized study involving 42 healthy nulliparous women.
- Intervention: a low-sodium diet (20 mmol/day) from week 14 of pregnancy until delivery.
- Outcome measures included maternal weight gain, blood pressure, cardiac output, systemic vascular resistance, hematocrit, and birth weight.
Main Results:
- The low-sodium group exhibited significantly lower maternal weight gain, energy intake, and postpartum weight.
- Cardiac output was reduced, and systemic vascular resistance was increased in the low-sodium group.
- Hematocrit levels were lower postpartum in the low-sodium group; however, blood pressure and birth weights were not significantly different.
Conclusions:
- Chronic sodium restriction in pregnancy results in reduced body fat accumulation and decreased circulating blood volume (plasma and red cells).
- This is accompanied by elevated systemic vascular resistance without significant alterations in maternal blood pressure or fetal birth weight.