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Lung degassing: an evaluation of two methods

P W Stengel, D G Frazer, K C Weber

    Journal of Applied Physiology: Respiratory, Environmental and Exercise Physiology
    |February 1, 1980
    PubMed
    Summary
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    Oxygen absorption atelectasis is more effective for removing trapped gas from lungs than vacuum degassing. Vacuum degassing is most effective at H2O vaporization pressure and when performed twice.

    Area of Science:

    • Pulmonary Physiology
    • Biomedical Engineering

    Background:

    • Trapped gas in lungs can impede respiratory function.
    • Effective methods for gas removal are crucial in pulmonary research and clinical applications.

    Purpose of the Study:

    • To compare the efficacy of oxygen absorption and vacuum degassing for removing trapped gas from lungs.
    • To investigate the impact of vacuum pressure, degassing frequency, and lung orientation on vacuum degassing effectiveness.

    Main Methods:

    • A custom-built capacitance spirometer was used to measure lung volume changes during vacuum degassing.
    • Lungs with trapped gas were subjected to vacuum degassing under varying conditions.
    • The effectiveness of oxygen absorption was compared against vacuum degassing.

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    Main Results:

    • Oxygen absorption atelectasis demonstrated superior gas removal compared to vacuum degassing.
    • Vacuum degassing was most effective when pressure reached the vaporization pressure of H2O and when performed twice.
    • Further degassing beyond twice did not yield significant additional gas removal.
    • Lung orientation did not influence gas removal efficiency during vacuum degassing.

    Conclusions:

    • Oxygen absorption is a more effective method for removing trapped gas from lungs than vacuum degassing.
    • Optimized vacuum degassing parameters include reducing pressure to H2O vaporization point and performing the procedure twice.