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Eur Ann Otorhinolaryngol Head Neck Dis. 2011 Jan;128(1):14-7. doi: 10.1016/j.anorl.2010.11.001. Epub 2010 Dec 23.

Assessment of mean auditory hazard incurred by occupational exposure to impulse noise.

Author information

1
Service d'interentreprises de santé au travail du CMIE, 14-16, Passage de Beslay, 75011 Paris, France. peter.forget@laposte.net

Abstract

OBJECTIVES:

To assess the collective hearing hazard entailed by occupational noise exposure.

METHODS:

The Late Audio-Sonometric Index (LASI) is a global score recommended for following up hearing loss in groups of workers exposed to traumatic noise, combining: daily noise exposure level (L(EX,8h) in dB(A)); individual hearing threshold level at 3 kHz (HTL (3kHz) in dB); HTL(0)(3)(kHz) targeted at retirement; and 5 (or 10) years age bracket between 50 and 59 years of age. LASI=HTL(0)(3kHz) - HTL (3kHz)+10 log (age - 20) - 10 log (0.23×L(EX,8h) - 17.36).

RESULTS:

When L(EX,8h) exceeds 80dB(A) and HTL(0)(3kHz) is at 25dB, occasional audiometric surveillance may be recommended for workers exposed to hazardous impulse noise: e.g., should the median and the mean LASI values fall below 20 for men or 23 for women (indicative threshold values).

CONCLUSION:

This exponential model thus integrates the fact that daily exposure to impulse noise may be more harmful for hearing than eight hours exposure to continuous noise of equivalent energy.

PMID:
21185251
DOI:
10.1016/j.anorl.2010.11.001
[Indexed for MEDLINE]
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