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Related Experiment Videos

Acetazolamide and CO2 in hyperbaric oxygen toxicity.

C D Wood

    Undersea Biomedical Research
    |March 1, 1982
    PubMed
    Summary

    Increased carbon dioxide (CO2) levels worsen hyperbaric oxygen toxicity. Buffering CO2 extended survival, while acetazolamide and added CO2 shortened it, highlighting CO2

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    Area of Science:

    • Physiology
    • Toxicology
    • Biochemistry

    Background:

    • Hyperbaric oxygen therapy (HBOT) offers therapeutic benefits but carries risks, including oxygen toxicity.
    • The precise mechanisms underlying hyperbaric oxygen toxicity remain incompletely understood.
    • Carbon dioxide (CO2) accumulation is a potential contributing factor to oxygen toxicity under hyperbaric conditions.

    Purpose of the Study:

    • To investigate the role of carbon dioxide (CO2) in the development of hyperbaric oxygen toxicity.
    • To determine the effects of altering CO2 levels on survival and toxicity endpoints in animals exposed to hyperbaric oxygen.

    Main Methods:

    • Animals were exposed to 100% oxygen at 50 psig in a pressure chamber until death.
    • Interventions included administration of acetazolamide (Diamox), Tris buffer, and sodium bicarbonate via i.p. injection.
    • Other groups were exposed to a hyperbaric atmosphere containing 5% CO2 and 95% O2.

    Main Results:

    • Tris buffer and sodium bicarbonate significantly prolonged survival time and delayed the onset of convulsions.
    • Acetazolamide and exposure to 5% CO2 significantly reduced survival time and hastened convulsion onset.
    • These interventions modulated tissue CO2 levels, correlating with changes in toxicity.

    Conclusions:

    • Elevated tissue carbon dioxide (CO2) levels play a significant role in exacerbating hyperbaric oxygen toxicity.
    • Modulating CO2 levels offers a potential strategy for mitigating hyperbaric oxygen toxicity.
    • Pulmonary edema secondary to systemic hypertension was identified as the cause of death in hyperbaric oxygen-exposed animals.

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