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[Decompression during lowered air pressure].

A A Bühlmann

    Schweizerische Medizinische Wochenschrift
    |June 30, 1984
    PubMed
    Summary
    This summary is machine-generated.

    This study confirms a linear relationship between inert gas overpressure and tolerated ambient pressure for divers and high-altitude individuals. This principle holds true even at simulated altitudes, indicating consistent decompression safety guidelines.

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    Area of Science:

    • Physiology
    • Diving Medicine
    • Aerospace Medicine

    Background:

    • A known linear relationship exists between inert gas overpressure and tolerated ambient pressure without symptoms in terrestrial diving.
    • Understanding this relationship is crucial for ensuring safety during decompression in various environments.

    Purpose of the Study:

    • To investigate if the established linear relationship between inert gas overpressure and tolerated ambient pressure without symptoms is also valid at simulated altitudes.
    • To assess the incidence of decompression sickness symptoms, specifically arthralgias, under reduced ambient pressure conditions.

    Main Methods:

    • Sixteen subjects were decompressed to 0.47 bar (6000 m altitude) and monitored for hypoxia and arthralgias.
    • 103 subjects underwent hyperbaric exposures (4.0-5.1 bar) followed by decompression to 0.60-0.85 bar with varying surface intervals.

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  • Ambient pressure reductions were compared against the tolerated linear relationship, and symptom development was recorded.

    • Main Results:

    • Hypoxia symptoms, but not arthralgias, were observed in subjects at simulated altitude (0.47 bar).
    • In 31 of 103 subjects, ambient pressure was reduced beyond the tolerated linear relationship.
    • Seven of these 31 subjects reported mild joint pain (arthralgias) during their stay at reduced ambient pressure.

    Conclusions:

    • The linear relationship between ambient pressure and inert gas overpressure tolerated without symptoms is validated at simulated altitude.
    • This finding suggests that current decompression models may be applicable across both diving and high-altitude environments.
    • Further research may refine decompression algorithms for enhanced safety at altitude and depth.