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Related Experiment Video

Updated: Jun 10, 2025

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Brain Magnetic Resonance Imaging Responses to Nonhypoxic Hypobaric Decompression.

Desmond Connolly, Indran Davagnanam, Marzena Wylezinska-Arridge

    Aerospace Medicine and Human Performance
    |October 21, 2024
    PubMed
    Summary
    This summary is machine-generated.

    This study found that altitude decompression sickness can cause white matter (WM) changes, indicated by reduced neuroprotective chemicals like GABA and GSH. These changes suggest oxidative stress and impaired microvascular flow, persisting for at least 24 hours post-exposure.

    Keywords:
    cerebral blood flowdecompression stresshyperoxianeurometabolitenon-hypoxic hypobariasubcortical white matter

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    Area of Science:

    • Aerospace Medicine
    • Neuroscience
    • Physiology

    Background:

    • Neurological decompression sickness (NDS) pathophysiology and its link to cerebral white matter (WM) changes under nonhypoxic hypobaria are not well understood.
    • Previous research has explored acute WM responses to hypobaric exposure using brain MRI.

    Purpose of the Study:

    • To investigate the effects of intensive hypobaric exposure on subcortical white matter integrity, cerebral blood flow, and neurometabolite concentrations.
    • To evaluate the association between cerebral subcortical white matter changes and nonhypoxic hypobaria.

    Main Methods:

    • Six healthy men underwent 6 hours of hyperoxic hypobaria with three decompressions to altitudes ≥ 22,000 ft.
    • Brain MRI was performed before and after decompression to assess subcortical WM integrity, cerebral blood flow, fractional anisotropy, and neurometabolites.

    Main Results:

    • No subcortical lesions or changes in WM fractional anisotropy were observed.
    • Mean WM blood flow increased by 20%, while gray matter flow remained unchanged.
    • Significant decrements in parietal subcortical WM levels of gamma-aminobutyric acid (GABA) and glutathione (GSH) were noted, with increased lactate in five subjects.

    Conclusions:

    • Decrements in GABA and GSH suggest WM insult, loss of neuroprotection, and oxidative stress following hypobaric exposure.
    • GSH decrements correlate with WM blood flow responses, indicating potential microvascular dysregulation.
    • Observed WM neurometabolite and blood flow changes did not normalize within 24 hours post-exposure.