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Related Experiment Video

Updated: Jan 30, 2026

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Placental diffusing capacities at varied carbon monoxide tensions

J M Bissonnette, W K Wickham, W H Drummond

    The Journal of Clinical Investigation
    |June 1, 1977
    PubMed
    Summary

    Carbon monoxide transfer across the placenta may be facilitated. Studies in pregnant ewes suggest carrier-mediated diffusion, with placental membrane diffusing capacity decreasing at higher carbon monoxide tensions.

    Area of Science:

    • Physiology
    • Obstetrics
    • Biochemistry

    Background:

    • Carbon monoxide (CO) transfer across the placenta is crucial for fetal development.
    • Understanding the mechanism of CO transfer is essential for managing pregnancy complications.

    Purpose of the Study:

    • To investigate whether carbon monoxide transfer across the placenta exhibits saturation kinetics, suggesting a facilitated diffusion process.
    • To differentiate between placental membrane diffusion and overall placental transfer capacity.

    Main Methods:

    • Utilized an in vivo preparation in eight pregnant ewes, perfusing the fetal side of the placenta with blood.
    • Varied fetal carboxyhemoglobin concentrations (4.8-70%) to assess CO transfer rates.
    • Calculated placental membrane diffusing capacity independently of hemoglobin reaction rates.

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    Main Results:

    • Fetal to maternal CO transfer decreased with increasing CO tensions.
    • The slope of log transfer rate vs. log partial pressure gradient differed significantly from 1.
    • Placental membrane diffusing capacity diminished at higher CO tensions, while urea permeability remained unchanged.

    Conclusions:

    • Results support the hypothesis that carbon monoxide diffusion across the placenta is, at least in part, a carrier-mediated process.
    • This suggests a potential regulatory mechanism for CO transfer, distinct from simple diffusion.