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Automatic balance for fetal weight studies

R M Abrams, J F Clapp, D Caton

    American Journal of Obstetrics and Gynecology
    |July 1, 1976
    PubMed
    Summary
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    Researchers developed an automatic balance to continuously weigh ewe fetuses. Fetal weight loss occurred during umbilical vein occlusion, indicating fetal blood volume changes.

    Area of Science:

    • Veterinary Physiology
    • Biomedical Engineering

    Background:

    • Accurate fetal weight measurement is crucial for understanding fetal development and response to physiological changes.
    • Previous methods for continuous fetal weighing were limited in accuracy and response time.

    Purpose of the Study:

    • To develop and validate a novel automatic balance for precise, continuous fetal weight monitoring.
    • To investigate fetal weight dynamics and blood volume changes in response to maternal blood volume alterations and umbilical vein occlusion.

    Main Methods:

    • Construction of an aluminum-based automatic balance utilizing miniature ball bearings and a strain gauge, capable of measuring 1-4 kg with +/- 0.5 Gm accuracy.
    • Continuous weighing of exteriorized term ewe fetuses for up to 3 hours.
    • Induction of maternal hypovolemia and reversible umbilical vein occlusion to assess fetal physiological responses.

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    Main Results:

    • The automatic balance demonstrated high accuracy (+/- 0.5 Gm) and rapid response time (<0.3 seconds).
    • Rapid maternal blood volume depletion resulted in a 10-24% increase in estimated fetal blood volume.
    • Consistent fetal weight loss was observed during reversible umbilical vein occlusion.

    Conclusions:

    • The developed automatic balance is a reliable tool for real-time fetal weight monitoring in physiological studies.
    • Fetal weight is sensitive to changes in maternal blood volume and umbilical blood flow, reflecting dynamic fetal circulatory adjustments.