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Temporary threshold shift caused by hearing aid use

J H Macrae1

  • 1National Acoustic Laboratories, Chatswood, New South Wales, Australia.

Journal of Speech and Hearing Research
|April 1, 1993
PubMed
Summary
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Excessive hearing aid gain can cause temporary threshold shift (TTS), a hearing impairment. Reducing gain at specific frequencies is recommended to prevent noise-induced hearing loss from hearing aid use.

Area of Science:

  • Audiology
  • Hearing Science
  • Noise-Induced Hearing Loss

Background:

  • Hearing aids are crucial for individuals with hearing loss.
  • Improper hearing aid gain settings can pose risks.
  • Previous research has explored noise exposure and hearing damage.

Purpose of the Study:

  • To investigate temporary threshold shift (TTS) in a student with severe sensorineural hearing loss.
  • To assess the relationship between hearing aid gain, in-ear noise levels, and TTS.
  • To evaluate the predictive accuracy of a mathematical model for TTS.

Main Methods:

  • Measured noise exposure using a noise dosimeter during hearing aid use.
  • Analyzed real-ear insertion response and input-output function of the hearing aid.

Related Experiment Videos

  • Calculated in-ear noise levels and predicted TTS using the Modified Power Law (MPL).

    • Main Results:

    • A 15-year-old student experienced significant TTS after 4 hours of hearing aid use.
    • In-ear noise levels were elevated due to gain settings 10-20 dB higher than National Acoustic Laboratories (NAL) recommendations.
    • Predicted TTS exceeded safety limits at frequencies up to 2000 Hz.

    Conclusions:

    • Hearing aid gain settings significantly impact in-ear noise exposure and TTS risk.
    • The Modified Power Law (MPL) effectively predicted TTS based on in-ear noise levels.
    • Reducing hearing aid gain between 500-1500 Hz is advisable to prevent TTS.