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Related Experiment Videos

Pressure chamber tympanometry in diving candidates.

A Shupak1, Z Sharoni, E Ostfeld

  • 1Department of Otolaryngology, Carmel Lady Davis Hospital, Haifa, Israel.

The Annals of Otology, Rhinology, and Laryngology
|August 1, 1991
PubMed
Summary

Divers may fail middle ear pressure equalization during dives, even if they pass surface-level tests. This study highlights the need for better diving fitness assessments to ensure diver safety and prevent ear injuries.

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Area of Science:

  • Otolaryngology
  • Diving Medicine
  • Aerospace Medicine

Background:

  • Current diving fitness evaluations assess middle ear autoinflation solely at surface pressure.
  • This method may not accurately predict middle ear pressure equalization capabilities under dive conditions.

Purpose of the Study:

  • To document and quantify middle ear pressure equalization failures in diving candidates during simulated dives.
  • To assess the efficacy of standard otologic criteria for diving fitness.

Main Methods:

  • Forty-two naval diving candidates underwent tympanometry at 1 and 1.1 absolute atmospheres (ATA) in a pressure chamber.
  • Measurements were taken with subjects in both seated (upright) and supine (recumbent) positions.

Main Results:

Related Experiment Videos

  • At 1 ATA, all 84 ears showed normal type A tympanograms.
  • At 1.1 ATA, 22.9% of upright ears and 9.6% of recumbent ears exhibited abnormal tympanograms (Type C or B), indicating equalization issues.

Conclusions:

  • Successful middle ear autoinflation at surface pressure does not guarantee equalization ability during simulated dives.
  • Standard diving fitness otologic criteria may be insufficient for identifying candidates at risk for middle ear barotrauma.