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Related Experiment Videos

Pathophysiology of inner ear dysfunction in the squirrel monkey in rapid decompression

J P Landolt, K E Money, E D Topliff

    Journal of Applied Physiology: Respiratory, Environmental and Exercise Physiology
    |December 1, 1980
    PubMed
    Summary

    Rapid decompression in hyperbaric chambers can cause inner ear damage in squirrel monkeys. Histology revealed hemorrhage and new bone growth, leading to vestibular deficits.

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    Area of Science:

    • Otolaryngology
    • Diving Medicine
    • Comparative Pathology

    Background:

    • Hyperbaric environments pose risks to the inner ear.
    • Understanding decompression sickness effects on the vestibular system is crucial for safety.

    Purpose of the Study:

    • To investigate the histological and behavioral effects of rapid decompression on the squirrel monkey inner ear.
    • To characterize the pathological sequelae of inner ear "hits" during hyperbaric exposure.

    Main Methods:

    • Squirrel monkeys with myringotomies underwent rapid decompression in a hyperbaric chamber.
    • Monkeys experiencing inner ear "hits" (indicated by nystagmus) were analyzed histologically and behaviorally at various time points post-dive.

    Main Results:

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    • Hemorrhage and precipitated material were observed in the otic fluid spaces within 1 month post-hit.
    • Ectopic new bone growth in semicircular canals occurred in over 1 month post-hit, but not in the cochlea.
    • Decompressed ears showed significant vestibular deficits correlating with histological findings.

    Conclusions:

    • Rapid decompression can induce significant inner ear pathology in squirrel monkeys.
    • New bone formation in the semicircular canals is a long-term consequence of decompression-induced inner ear injury.
    • These findings highlight the ototoxic potential of hyperbaric decompression and its impact on vestibular function.