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Extended high-frequency thresholds in noise-induced hearing loss

P Hallmo1, H M Borchgrevink, I W Mair

  • 1Department of Otorhinolaryngology, Ullevål University Hospital, Oslo, Norway.

Scandinavian Audiology
|January 1, 1995
PubMed
Summary

Occupational noise exposure causes extended high-frequency hearing loss in all age groups. However, age significantly impacts extended high-frequency hearing loss only in individuals with mild conventional noise-induced hearing loss.

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Area of Science:

  • Audiology
  • Occupational Health
  • Hearing Science

Background:

  • Occupational noise exposure is a significant risk factor for hearing loss.
  • Extended high-frequency (EHF) hearing assessment (9-18 kHz) can detect early auditory changes.
  • Understanding the interplay between age and noise-induced hearing loss (NIHL) in EHF ranges is crucial.

Purpose of the Study:

  • To investigate the presence and characteristics of EHF hearing loss in males with occupational noise exposure.
  • To examine the influence of age on EHF hearing thresholds across different grades of conventional NIHL.

Main Methods:

  • Audiometric thresholds (air and bone conduction) were measured in conventional frequencies (0.5-8 kHz).
  • Air-conduction thresholds were assessed in the extended high-frequency range (9-18 kHz).

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  • 167 males with occupational noise exposure history were grouped by age and classified by NIHL severity.

    • Main Results:

    • Threshold elevation in the EHF range was observed in all participants, irrespective of age or conventional hearing loss grade.
    • An age-related effect on EHF thresholds was only evident in subjects with the mildest grades of conventional NIHL.
    • EHF hearing loss is a consistent finding in noise-exposed individuals, with age being a modifying factor in early stages.

    Conclusions:

    • EHF audiometry is sensitive to occupational noise exposure across all age groups.
    • Age plays a role in the progression of EHF hearing loss, particularly in individuals with less severe conventional NIHL.
    • Early detection of EHF hearing changes may inform targeted hearing conservation strategies for noise-exposed workers.