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Inulin space studies in fetal sheep.

S U Devaskar, U P Devaskar, L I Kleinman

    Developmental Pharmacology and Therapeutics
    |January 1, 1985
    PubMed
    Summary

    Extracellular volume in fetal sheep increases with gestational age, but decreases as a percentage of body weight. This study measured 14C inulin space in fetal lambs to determine these changes.

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    Area of Science:

    • Physiology
    • Perinatal Biology
    • Fetal Development

    Background:

    • Accurate estimation of extracellular volume is crucial for understanding fetal physiology and development.
    • Changes in extracellular volume during gestation can impact fetal well-being and growth.

    Purpose of the Study:

    • To estimate the extracellular volume in fetal sheep across a range of gestational ages.
    • To determine the relationship between gestational age, fetal weight, and extracellular volume.

    Main Methods:

    • In situ measurement of 14C inulin space in unanesthetized fetal lambs.
    • Study included 6 fetal lambs with gestational ages from 120 to 145 days (term = 150 days).

    Main Results:

    • Total inulin space ranged from 979 to 1,510 ml.
    • A positive correlation was found between total inulin space and gestational age (r = 0.65).
    • Extracellular volume as a percentage of body weight decreased with gestational age (r = -0.80).

    Conclusions:

    • Fetal extracellular volume increases in absolute terms with advancing gestation.
    • The proportion of extracellular volume relative to body weight declines as fetal development progresses.
    • These findings provide insights into fluid dynamics and body composition changes during ovine fetal development.

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