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Permanent threshold shift associated with overamplification by hearing aids.

J H Macrae1

  • 1National Acoustic Laboratories, Chatswood, Australia.

Journal of Speech and Hearing Research
|April 1, 1991
PubMed
Summary
This summary is machine-generated.

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The Modified Power Law (MPL) can predict permanent threshold shift (PTS) in children with hearing loss due to hearing aid overamplification. This model helps understand noise-induced hearing damage in pediatric populations.

Area of Science:

  • Audiology
  • Hearing Science
  • Biomedical Engineering

Background:

  • Sensorineural hearing loss (SNHL) affects children, necessitating hearing aid use.
  • Hearing aid overamplification can potentially cause further hearing damage, including permanent threshold shift (PTS).
  • Predictive models for noise-induced hearing loss are crucial for audiological management.

Purpose of the Study:

  • To evaluate the Modified Power Law (MPL) hypothesis for predicting PTS in children with SNHL.
  • To assess the efficacy of the MPL in predicting hearing loss resulting from hearing aid overamplification.
  • To analyze the characteristics of PTS induced by hearing aid use in pediatric SNHL.

Main Methods:

  • Utilized data from 8 children with severe SNHL experiencing PTS due to hearing aid overamplification.

Related Experiment Videos

  • Applied the Modified Power Law (MPL) combined with Kraak's logarithmic equation.
  • Estimated real ear output levels of hearing aids to predict PTS growth.

    • Main Results:

    • The MPL successfully predicted the growth of PTS in children with SNHL exposed to overamplified hearing aids.
    • Observed PTS was generally flat across frequencies and temporally mirrored noise-induced PTS in normal-hearing individuals.
    • PTS onset was relatively quick, with a slower development rate compared to normal-hearing subjects.

    Conclusions:

    • The Modified Power Law (MPL) is a viable tool for predicting permanent threshold shift (PTS) in pediatric hearing aid users with SNHL.
    • Hearing aid overamplification, even in children with existing hearing loss, can induce predictable PTS.
    • This predictive capability aids in managing hearing aid settings to prevent further hearing damage.