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Hearing function in a hyperbaric environment.

L L Mendel1, M E Knafelc, E A Cudahy

  • 1Center for Speech and Hearing Research, University of Mississippi, University, USA.

Undersea & Hyperbaric Medicine : Journal of the Undersea and Hyperbaric Medical Society, Inc
|September 30, 2000
PubMed
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Navy divers

Area of Science:

  • Physiological acoustics
  • Hyperbaric audiology
  • Occupational hearing science

Background:

  • Diving to extreme depths presents unique physiological challenges.
  • Hearing function anomalies have been observed in divers under hyperbaric conditions.
  • Understanding these changes is crucial for diver safety and performance.

Purpose of the Study:

  • To investigate navy divers' hearing function during saturation deep dives.
  • To identify explanations for hearing threshold shifts experienced at depth.
  • To assess the impact of hyperbaric heliox environments on auditory mechanisms.

Main Methods:

  • Evaluated pure-tone thresholds (air and bone conduction) at various depths.
  • Utilized real ear probe microphone measurements and auditory evoked potentials.

Related Experiment Videos

  • Assessed central auditory processing and attempted otoacoustic emissions.
  • Conducted measurements in a specialized pressurized sound booth.

    • Main Results:

    • Most audiometric thresholds remained stable at depth compared to surface measurements.
    • Hearing sensitivity showed improvement at high frequencies (6,000 and 8,000 Hz) at depth.
    • Ear canal resonance frequency shifted upwards, attributed to helium's effect.
    • Auditory evoked potentials and central processing were largely unaffected by depth.

    Conclusions:

    • Hyperbaric heliox environments generally preserve most aspects of hearing function.
    • Observed shifts in ear canal resonance and high-frequency hearing improvements are notable.
    • Methodological limitations prevented full assessment of middle and inner ear function.
    • Findings suggest current hearing protection strategies are largely effective for deep diving.