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Modification of pulmonary gas mixing by postural changes.

H A Jones, E E Davies, J M Hughes

    Journal of Applied Physiology (Bethesda, Md. : 1985)
    |July 1, 1986
    PubMed
    Summary

    Posture significantly impacts gas mixing in the lungs, affecting how helium and sulfur hexafluoride distribute. This lung ventilation difference is linked to posture, not just lung volume.

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    Area of Science:

    • Respiratory Physiology
    • Gas Exchange Dynamics
    • Pulmonary Function Testing

    Background:

    • Gas mixing efficiency in the lungs is crucial for effective oxygen uptake and carbon dioxide removal.
    • Differences in gaseous diffusivity between gases like helium and sulfur hexafluoride can highlight regional ventilation inequalities.
    • Pulmonary mechanics and gas distribution are known to be influenced by body posture.

    Purpose of the Study:

    • To investigate the effect of different body postures on the intrapulmonary mixing of gases with disparate diffusivities.
    • To determine if posture-induced changes in lung volume are the primary drivers of altered gas mixing.
    • To elucidate the role of convective and diffusive factors in ventilation distribution across various postures.

    Main Methods:

    • A rebreathing method was employed using helium (He) and sulfur hexafluoride (SF6) in nine healthy subjects.
    • Measurements were taken in seated, supine, and lateral decubitus positions at a constant tidal volume and frequency.
    • Functional residual capacity (FRC) was measured, and experiments were conducted at both relaxed and adjusted lung volumes.

    Main Results:

    • Gas mixing equilibrium (n99) for He and SF6 showed no significant difference in the supine posture.
    • A significant difference in He-SF6 mixing was observed in the erect posture (P < 0.01) and was greatest in the lateral decubitus position (P < 0.001).
    • Altering lung volume did not abolish the posture-dependent He-SF6 mixing difference, suggesting mechanisms beyond simple volume changes.

    Conclusions:

    • Body posture exerts a significant influence on intrapulmonary gas mixing, independent of lung volume.
    • The observed differences in gas mixing are attributed to posture-dependent changes in the distribution of ventilation per unit lung volume.
    • Convective and diffusive processes are key determinants of ventilation distribution influenced by body position.

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