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Related Experiment Videos

Visual evoked and brain stem auditory evoked potentials in divers.

K Todnem1, R Vaernes, B K Kambestad

  • 1Norwegian Underwater Technology Centre, Bergen.

Aviation, Space, and Environmental Medicine
|October 1, 1991
PubMed
Summary

Visual evoked potentials (VEP) and brain stem auditory evoked potentials (BAEP) showed temporary changes in divers at depth. These electrophysiological tests indicate no major permanent damage to visual or auditory pathways from hyperbaric pressure.

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Area of Science:

  • Neuroscience
  • Hyperbaric Medicine
  • Physiology

Background:

  • Divers experience extreme hyperbaric pressure, potentially affecting neurological function.
  • Electrophysiological tests like VEP and BAEP are used to assess sensory pathway integrity.

Purpose of the Study:

  • To investigate the effects of hyperbaric pressure on visual and auditory pathways in divers.
  • To determine if VEP and BAEP can detect permanent neurological disturbances in divers.

Main Methods:

  • VEP and BAEP were recorded in divers during and after deep dives (up to 360 msw).
  • Comparisons were made between pre- and post-dive measurements, and between divers and a control group.
  • VEP and BAEP were also assessed in divers treated for neurological decompression sickness.

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Main Results:

  • VEP latencies significantly increased with dive depth.
  • Post-dive, N75 VEP latency increased, while P100 and N145 showed no significant change.
  • BAEP I-V latency decreased post-dive, and BAEP I-III interpeak latency increased in divers compared to controls.
  • No significant differences in VEP or BAEP were found in divers treated for decompression sickness.

Conclusions:

  • Hyperbaric pressure causes transient alterations in VEP and BAEP.
  • These evoked potentials do not reveal significant permanent damage to the visual and auditory systems in divers.
  • VEP and BAEP are sensitive to acute pressure changes but may not be indicative of long-term neurological injury in divers.