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Related Experiment Videos

Beta-endorphin in pregnancy.

U Goebelsmann, T K Abboud, D I Hoffman

    European Journal of Obstetrics, Gynecology, and Reproductive Biology
    |May 1, 1984
    PubMed
    Summary
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    Maternal and fetal plasma beta-endorphin (beta-EP) levels indicate stress. Pregnancy itself is not stressful, but labor pain and fetal distress significantly increase beta-EP concentrations.

    Area of Science:

    • Obstetrics and Gynecology
    • Reproductive Endocrinology
    • Perinatal Medicine

    Background:

    • Plasma beta-endorphin (beta-EP) levels change throughout pregnancy and labor.
    • Understanding beta-EP regulation offers insights into maternal and fetal stress responses.

    Purpose of the Study:

    • To investigate the dynamics of beta-endorphin concentrations in maternal plasma, umbilical cord blood, and amniotic fluid during pregnancy, labor, and delivery.
    • To correlate beta-EP levels with physiological states such as labor pain, anesthesia, and fetal distress.

    Main Methods:

    • Radioimmunoassay (RIA) was used to quantify beta-endorphin concentrations.
    • Measurements were taken from maternal plasma, umbilical venous and arterial plasma, and amniotic fluid.
    • Samples were collected at various stages: during pregnancy, labor, postpartum, and before cesarean sections.

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    Main Results:

    • Maternal plasma beta-EP declines during pregnancy, rises during labor and postpartum, and increases before elective cesarean section.
    • Epidural anesthesia reduces beta-EP during labor; general anesthesia increases it for cesarean section.
    • Umbilical venous beta-EP is unaffected by delivery mode but rises with fetal distress; umbilical arterial levels rise faster in distress.
    • Amniotic fluid beta-EP is higher in the second than third trimester.

    Conclusions:

    • Peripheral plasma beta-EP concentrations serve as a biomarker for maternal and fetal stress.
    • Labor pain, not uterine contractions per se, elevates maternal beta-EP.
    • Fetal hypoxia and acidosis are key triggers for increased fetal beta-EP.
    • The source and role of amniotic fluid beta-EP require further investigation.