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Preeclampsia and fetal growth.
R A Odegård1, L J Vatten, S T Nilsen
1Institute of Cancer Research and Molecular Biology, University Medical Center, Trondheim, Norway. ronnaug.odegard@medisin.ntnu.no
Obstetrics and Gynecology
|November 21, 2000
Summary
Preeclampsia significantly reduces birth weight, especially severe or early-onset cases. Maternal smoking adds to this growth restriction, with recurrent preeclampsia posing the highest risk for small for gestational age infants.
Area of Science:
- Obstetrics and Gynecology
- Perinatal Medicine
- Fetal Growth Research
Background:
- Preeclampsia is a pregnancy complication affecting maternal and fetal health.
- The impact of preeclampsia on fetal growth can vary based on its clinical presentation.
- Maternal factors like smoking may influence fetal growth in the context of preeclampsia.
Purpose of the Study:
- To investigate how different clinical manifestations of preeclampsia affect birth size.
- To assess if maternal smoking modifies the relationship between preeclampsia and fetal growth.
- To analyze the risk of small for gestational age (SGA) infants in relation to preeclampsia severity and onset.
Main Methods:
- A cohort study of 12,804 deliveries, comparing 307 infants born after preeclamptic pregnancies to 619 controls.
- Preeclampsia defined by elevated diastolic blood pressure and proteinuria after 20 weeks' gestation.
- Classification of preeclampsia by severity (mild, moderate, severe, eclampsia, HELLP syndrome) and onset (early, late); birth size assessed by observed/expected birth weight ratio and SGA classification.
Main Results:
- Preeclampsia was associated with a 5% reduction in birth weight; severe and early-onset preeclampsia showed greater reductions (12% and 23%, respectively).
- The risk of SGA was four times higher in preeclamptic pregnancies (RR=4.2).
- Recurrent preeclampsia significantly increased SGA risk (RR=12.3), and maternal smoking appeared to additively contribute to growth restriction.
Conclusions:
- Severe and early-onset preeclampsia are linked to substantial fetal growth restriction.
- Recurrent preeclampsia dramatically elevates the risk of having an SGA infant.
- Maternal smoking's effect on growth restriction is additive to that of preeclampsia, without synergistic interaction.