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Related Experiment Videos

Human maternal-fetal lactate relationships.

J S Suidan, C Antoine, F Silverman

    Journal of Perinatal Medicine
    |January 1, 1984
    PubMed
    Summary

    Fetal blood lactate levels increase with labor, peaking during vaginal delivery. Higher lactate indicates greater fetal stress, suggesting lactate measurement can evaluate fetal well-being during childbirth.

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    Area of Science:

    • Perinatal Medicine
    • Biochemistry
    • Obstetrics

    Background:

    • Fetal stress during labor is a critical concern in obstetrics.
    • Assessing fetal well-being often relies on indirect measures.
    • Lactate, a byproduct of anaerobic metabolism, may serve as a direct indicator of fetal distress.

    Purpose of the Study:

    • To identify the primary source of lactate in fetuses.
    • To evaluate the utility of fetal blood lactate measurements for assessing fetal stress during labor.
    • To compare lactate levels in normal and depressed fetuses.

    Main Methods:

    • Collected umbilical arterial and venous blood samples, along with maternal radial arterial samples, from 132 liveborn infants at delivery.
    • Immediately analyzed all blood samples for pH, blood gases, and lactate concentrations.
    • Categorized newborns into vigorous (Apgar score ≥7) and depressed (Apgar score <7) groups.

    Main Results:

    • Lactate levels in vigorous newborns were lowest with elective cesarean section before labor, intermediate with cesarean section during labor, and highest with vaginal delivery.
    • Fetal lactate levels (umbilical artery and vein) were significantly higher than maternal levels, with the difference increasing with labor intensity.
    • Depressed newborns exhibited higher umbilical lactate levels and greater fetal-maternal lactate differences compared to vigorous newborns.

    Conclusions:

    • Blood lactate levels increase in both mother and fetus with labor, reaching peak values during vaginal delivery.
    • The umbilical artery shows the highest lactate concentration, followed by the umbilical vein, and then the maternal artery.
    • Fetal blood lactate measurement appears applicable for evaluating fetal stress during labor, particularly in distinguishing between vigorous and depressed infants.

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