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Related Experiment Videos

Factors determining temporal pattern of isobaric supersaturation.

C Young, B G D'Aoust

    Journal of Applied Physiology: Respiratory, Environmental and Exercise Physiology
    |October 1, 1981
    PubMed
    Summary

    Breathing gases with different equilibration rates can cause transient supersaturation, potentially leading to vascular bubbles at high pressures. Diffusion effects are minimal except in long tissues with high blood flow.

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    Area of Science:

    • Physiology
    • Biophysics
    • Gas Exchange Dynamics

    Background:

    • Transient supersaturation/undersaturation in blood and tissues can be induced by breathing gases with varying equilibration rates.
    • High ambient gas pressure during supersaturation can lead to the formation of vascular bubbles.
    • Classical models of inert gas elimination often minimize diffusion effects, potentially underestimating supersaturation.

    Purpose of the Study:

    • To estimate the impact of diffusion on transient supersaturation within a Krogh cylinder.
    • To investigate how changes in inert gas partial pressure affect supersaturation in blood.
    • To determine the conditions under which diffusion significantly influences supersaturation.

    Main Methods:

    • Modeling diffusion effects in a Krogh cylinder.

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  • Estimating supersaturation following sudden changes in inert gas partial pressure.
  • Experimental measurement of vascular bubble production after inert gas switching.

    • Main Results:

    • Diffusion plays a role in transient supersaturation primarily in long Krogh cylinders with high blood flows.
    • The time required to switch inert gases in arterial blood reduces the impact of diffusion.
    • Experimental data on vascular bubble formation after gas switching suggest factors beyond differing diffusion constants are involved.

    Conclusions:

    • Diffusion is a significant factor in transient supersaturation only under specific physiological conditions (long Krogh cylinders, high blood flow).
    • The dynamics of inert gas switching in arterial blood mitigate diffusion's influence.
    • Vascular bubble formation post-gas switching involves mechanisms not solely explained by diffusion rates.