Otoacoustic emissions at compensated middle ear pressure in children

Int J Audiol. 2005 Jun;44(6):317-20. doi: 10.1080/14992020500057822.

Abstract

Middle ear pathology has a negative effect on the detectability of otoacoustic emissions. In this study, we investigated the effect of compensating a deviant static middle ear pressure while measuring transient evoked otoacoustic emissions (TEOAEs). In 59 children (mean age 4 years, 5 months) TEOAEs were measured twice in one session: first at ambient pressure and than at compensated middle ear pressure. On average, TEOAE amplitudes increased by 1.9 dB as a result of middle ear pressure compensation. The amplitude increase was largest in frequency bands centred at 1 and 2 kHz and a statistically significant correlation was found between the amount of compensated pressure and the TEOAE amplitude increase. In the higher frequency bands centred at 3 and 4 kHz, TEOAE amplitudes were almost insensitive to pressure compensation. These results show that measuring OAEs at compensated middle ear pressure enhances the amplitude of TEOAEs, and thus improves the detectability.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Acoustic Impedance Tests
  • Audiometry, Pure-Tone
  • Child
  • Child, Preschool
  • Ear, Middle / physiology*
  • Eustachian Tube
  • Female
  • Humans
  • Infant
  • Male
  • Middle Ear Ventilation
  • Otoacoustic Emissions, Spontaneous / physiology*
  • Pressure
  • Tympanic Membrane