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OTORINOLARINGOLOGIA

A Journal on Otorhinolaryngology, Head and Neck Surgery,
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Otorinolaringologia 2000 March;50(1):7-11

language: Italian

Influence of age and noise exposure in noise induced hearing loss evolution

Cavalot A. L., Giordano M., Lacilla M., Rosso P., Palonta F., Albera R.

Università degli Studi di Torino Dipartimento di Fisiopatologia Clinica, II Cattedra di ORL


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Background. The aim of the study was to determine, which could be the principal factor, between age and noise exposure, determining hearing threshold worsening after the first 10 years of exposition to professional noise causing noise-induced hearing loss.
Methods. The study was carried on 568 males affected by noise-induced hearing loss with a noise exposure of 11-49 years. All patients were submitted to pure tone audiometry at least 16 hours after the last noise exposure. Threshold was evaluated at a frequency range between 500-8000 Hz.
Results. Hearing threshold shows a progressive worsening in relation to age and noise exposure duration. However hearing threshold worsening appear to be more correlated with age than with noise exposure, except for 6 KHz.
Conclusions. The results obtained show that after the appearance of a noise-induced hearing loss age is the most important factor influencing hearing worsening; therefore aged subjects affected by acoustic trauma could be considered more sensitive to hearing loss evolution.

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