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Occupational lead exposure and hearing loss

L S Forst1, S Freels, V Persky

  • 1Department of Emergency Medicine, College of Medicine, University of Illinois at Chicago 60612, USA.

Journal of Occupational and Environmental Medicine
|July 1, 1997
PubMed
Summary

Lead exposure is linked to hearing loss in workers. This study found a correlation between higher blood lead levels and hearing threshold at 4000 Hz, suggesting a need for audiometric testing in occupational health surveillance.

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Area of Science:

  • Occupational Health
  • Audiology
  • Toxicology

Background:

  • Studies suggest a link between lead exposure and hearing loss across various populations.
  • Mandated medical surveillance for lead-exposed workers may benefit from including audiometric testing.

Purpose of the Study:

  • To examine the relationship between blood lead levels and hearing loss in occupational settings.
  • To investigate the potential for audiometric testing in lead-exposed worker surveillance.

Main Methods:

  • A cross-sectional study analyzed computerized data from 183 workers.
  • Data included audiometry results and blood lead levels from a private occupational health screening company.

Main Results:

  • A statistically significant correlation was observed between blood lead level and elevated hearing threshold at 4000 Hz (P = 0.03).

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  • No significant correlations were found at other tested frequencies.
  • Potential interactions with other exposure factors or susceptibility of the organ of Corti were suggested.

    • Conclusions:

    • Blood lead levels may be associated with hearing loss at specific frequencies, particularly 4000 Hz.
    • Further research is needed to explore confounding factors and the precise mechanisms involved.
    • Worker surveillance databases can aid in studying occupational health connections.