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Early Human Pathophysiological Responses to Exertional Hypobaric Decompression Stress.

Desmond M Connolly, Leigh A Madden, Victoria C Edwards

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    This summary is machine-generated.

    Altitude decompression stress causes inflammation and incomplete recovery, indicated by elevated biomarkers like interleukin-6 (IL-6) and glial fibrillary acidic protein. These changes suggest ongoing physiological effects the day after exposure.

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    Area of Science:

    • Environmental physiology
    • Aerospace medicine
    • Biomarker research

    Background:

    • Decompression sickness biomarkers at altitude are not well-established.
    • Previous research explored decompression sickness risk at 25,000 ft.
    • This study evaluated early physiological responses to exertional decompression stress.

    Purpose of the Study:

    • To identify blood biomarkers of hypobaric decompression stress.
    • To assess pathophysiological responses to simulated altitude exposure.
    • To investigate the inflammatory and neurological effects of combined stressors.

    Main Methods:

    • 15 healthy men ascended to 25,000 ft twice, breathing 100% oxygen after denitrogenation.
    • Blood samples were collected at baseline, immediately post-ascent, and 24 hours later.
    • Analyses included hematology, cytokines (IL-6), inflammatory markers (CRP, C5a), and brain injury markers (GFAP).

    Main Results:

    • Hematological parameters normalized by 24 hours post-exposure.
    • Interleukin-6 (IL-6) showed a five-fold increase, linked to venous gas emboli.
    • Persistent elevations in C-reactive protein, C5a, and glial fibrillary acidic protein (GFAP) were observed 24 hours post-exposure.

    Conclusions:

    • Combined hyperoxia, decompression, and exertion trigger an IL-6 mediated inflammatory response.
    • Persistent biomarker elevations suggest incomplete physiological recovery 24 hours after exposure.
    • Elevated GFAP indicates incomplete resolution of neurological insult.