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Placental diffusing capacity and its relation to fetal growth.

J M Bissonnette, L D Longo, M J Novy

    Journal of Developmental Physiology
    |October 1, 1979
    PubMed
    Summary

    Researchers measured placental diffusing capacity for carbon monoxide in monkeys. This key index of placental respiratory gas exchange was quantified to understand fetal development and compare across species.

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    Area of Science:

    • Physiology
    • Comparative Medicine
    • Maternal-Fetal Medicine

    Background:

    • The placenta facilitates vital respiratory gas exchange between mother and fetus.
    • Quantifying placental diffusing capacity is crucial for understanding fetal development and health.
    • Previous studies have measured placental diffusing capacity in various species, providing a basis for comparison.

    Purpose of the Study:

    • To measure the placental diffusing capacity for carbon monoxide (CO) in unanesthetized rhesus monkeys (Macaca mulatta).
    • To establish a quantitative index of placental respiratory gas exchange in a non-human primate model.
    • To discuss the implications of these findings for fetal growth and comparative placental physiology.

    Main Methods:

    • Carbon monoxide (CO) uptake was measured in unanesthetized rhesus monkeys using chronically placed maternal and fetal catheters.
    • Mothers inhaled controlled concentrations of CO (50 or 100 ppm).
    • Placental diffusing capacity was calculated as CO uptake divided by the partial pressure difference across the placenta, normalized to fetal weight.

    Main Results:

    • The average placental diffusing capacity for CO in rhesus monkeys was 0.646 ± 0.062 (SEM) ml x min⁻¹ x torr⁻¹ x kg⁻¹ of fetal weight.
    • This measurement provides a quantitative index of the efficiency of gas transfer across the primate placenta.
    • The results are discussed in the context of interspecies comparisons and potential impacts on fetal growth.

    Conclusions:

    • The study successfully quantified placental diffusing capacity for CO in rhesus monkeys, providing a valuable physiological parameter.
    • This measurement serves as an important index for assessing placental function and its role in supporting fetal development.
    • The findings contribute to a broader understanding of comparative placental physiology and respiratory gas exchange across species.

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