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Obstetrics & Gynecology 1996;87:937-942
© 1996 by The American College of Obstetricians and Gynecologists
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Articles

The impact of gestational age and fetal growth on the maternal-fetal glucose concentration difference

AM Marconi, C Paolini, M Buscaglia, G Zerbe, FC Battaglia, and G Pardi

OBJECTIVE: To test whether the human fetus accommodates to the increasing glucose requirements of late pregnancy with an increased maternal-fetal glucose concentration gradient and whether there are differences in pregnancies with fetal growth restriction (FGR) according to clinical severity. METHODS: Umbilical venous glucose concentration was measured in 77 normal pregnancies (appropriate for gestational age [AGA]) and 42 pregnancies complicated by FGR at the time of fetal blood sampling. In 40 AGA and in all FGR cases, a maternal "arterialized" blood sample was collected simultaneously. Growth-restricted fetuses were subdivided into three groups according to fetal heart rate (FHR) recordings and Doppler measurements of the umbilical artery pulsatility index (PI): group 1 (normal FHR and PI; 12 cases), group 2 (normal FHR, abnormal PI; 17 cases) and group 3 (abnormal FHR and PI; 13 cases). RESULTS: In normal pregnancies with increasing gestational age, there was a significant decrease (P < .001) of umbilical venous glucose concentration and a significant increase of the maternal-fetal glucose concentration difference (P < .001). In addition, there was a significant relation between fetal and maternal glucose concentrations (P < .001). In FGR pregnancies, the maternal-fetal glucose concentration difference was significantly higher in fetuses of groups 2 and 3 compared with normal pregnancies and FGR pregnancies of group 1. CONCLUSION: In human pregnancy, the fetal glucose concentration is a function of both gestational age and the maternal glucose concentration. In FGR pregnancies, as an accommodation of the fetus to a restricted placental size and placental glucose transport capacity, the maternal-fetal glucose concentration difference is increased, and this increase is a function of the clinical severity.


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