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Hearing parameters in noise exposed industrial workers

O Celik1, S Yalçin, A Oztürk

  • 1Department of Otorhinolaryngology, Medical School, Firat University, Elaziğ, Turkey. onurcelik@yahoo.com

Auris, Nasus, Larynx
|December 16, 1998
PubMed
Summary

Industrial noise exposure significantly impacts hearing, causing sensorineural hearing loss primarily at 4-6 kHz within the first decade. Acoustic reflex thresholds at 4 kHz were notably affected in exposed workers.

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Area of Science:

  • Occupational Health
  • Audiology
  • Environmental Noise Effects

Background:

  • Hydro-electric power plant workers face significant noise exposure.
  • Occupational noise is a known risk factor for hearing impairment.

Purpose of the Study:

  • To investigate the effects of high-level noise exposure on hearing thresholds and acoustic reflexes in industrial workers.
  • To compare hearing outcomes between noise-exposed workers and a control group with normal hearing.

Main Methods:

  • Study included 130 noise-exposed industrial workers and 33 control subjects.
  • Hearing and acoustic reflex thresholds were measured for all participants.
  • Age-matched subgroups were analyzed for comparative assessment.

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Main Results:

  • Sensorineural hearing loss was detected in 71 workers, characterized as bilateral, symmetrical, and affecting 4-6 kHz frequencies.
  • Hearing loss developed within the initial 10 years of noise exposure, with slight progression thereafter.
  • A statistically significant difference in acoustic reflex thresholds was observed only at 4 kHz (p < 0.0005) between groups.

Conclusions:

  • Prolonged occupational noise exposure in hydro-electric power plants leads to sensorineural hearing loss.
  • Early detection and intervention are crucial, as hearing damage manifests within the first decade.
  • Acoustic reflex testing at 4 kHz may serve as an indicator for noise-induced hearing changes.