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Related Experiment Videos

Effects of systemic hyperoxia on eustachian tube ventilatory function

A Shupak1, R Tabari, J D Swarts

  • 1Department of Pediatric Otolaryngology, Children's Hospital of Pittsburgh, Pennsylvania, USA.

The Laryngoscope
|October 23, 1997
PubMed
Summary

Systemic hyperoxia may impair eustachian tube ventilatory function (ETVF), affecting middle ear pressure regulation. This research explores how breathing oxygen impacts the eustachian tube

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Area of Science:

  • Otolaryngology
  • Diving Medicine
  • Physiology

Background:

  • Oxygen diving is linked to middle ear issues like negative pressure and effusions.
  • Middle ear gas hyperoxia is known to impair eustachian tube ventilatory function (ETVF).

Purpose of the Study:

  • To determine if systemic hyperoxia, with normal middle ear air, affects ETVF.
  • Investigate the impact of breathing 100% oxygen on eustachian tube function.

Main Methods:

  • Four cynomolgus monkeys were studied.
  • Eustachian tube ventilatory function (ETVF) was assessed using forced-response and inflation-deflation tests.
  • Animals breathed either room air or 100% normobaric oxygen.

Main Results:

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  • Systemic hyperoxia led to higher opening, closing, and steady-state pressures.
  • Under hyperoxia, pressure equalization and swallow-induced pressure changes were reduced.
  • Impaired ETVF was observed during systemic hyperoxia.

    • Conclusions:

    • Systemic hyperoxia appears to negatively impact eustachian tube ventilatory function (ETVF).
    • This finding contributes to understanding middle ear dysfunction after oxygen diving.