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Effects of a hyperbaric environment on human brain stem function with specific reference to auditory brain stem

S Wada1, S Matsuoka, C Kadoya

  • 1Department of Neurosurgery, School of Medicine, University of Occupational and Environmental Health, Kitakyushu, Japan.

Journal of UOEH
|September 1, 1988
PubMed
Summary
This summary is machine-generated.

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Deep diving with helium-oxygen caused transient brain stem dysfunction in professional divers. Auditory brain stem responses showed changes indicating nervous system effects during saturation dives beyond 150 meters.

Area of Science:

  • Physiology
  • Neuroscience
  • Marine Biology

Background:

  • High-pressure environments pose risks to human physiology.
  • Understanding nervous system function under extreme pressure is crucial for deep-sea exploration.

Purpose of the Study:

  • To assess brain stem function in professional divers during simulated deep-sea saturation dives.
  • To investigate the effects of hyperbaric conditions on auditory brain stem responses (ABRs).

Main Methods:

  • Four professional divers underwent hyperbaric chamber dives using helium-oxygen at 31 ATA.
  • Auditory brain stem responses (ABRs) were recorded to evaluate brain stem function at various simulated depths.
  • Divers reported clinical symptoms during saturation dives between 150-250 meters.

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Main Results:

  • No significant changes in ABRs were observed at 150 meters depth.
  • Divers experienced symptoms like euphoria, ataxia, and dyspnea between 150-250 meters.
  • Interpeak latencies (I-III and I-V) of ABRs increased during deeper dives, showing a tendency to recover.
  • Changes in I-III and I-V interpeak latencies were independent.

Conclusions:

  • Hyperbaric exposure between 150-300 meters can cause transient neurological dysfunction, both clinically and subclinically.
  • The independent changes in ABR interpeak latencies suggest distinct neural pathways for wave III and wave V generation.