Syed M. Ahmed and Tar-Ching Aw

in Oxford Textbook of Medicine

Published on behalf of Oxford University Press

Published in print May 2010 | ISBN: 9780199204854
Published online May 2010 | e-ISBN: 9780199570973 | DOI:

Series: Oxford Textbooks


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For clinical purposes, noise is measured in decibels weighted according to the sensitivity of the human ear (dB(A)). Regardless of source, the effects of overexposure to noise are similar. Initially there is a temporary threshold shift, where reversibility of hearing loss is possible with removal away from further noise. Permanent threshold shift occurs following prolonged and/or intense exposure, with poor prospects for improvement of hearing. The classical audiogram for noise-induced hearing loss shows a 4 kHz dip. Prevention is by reducing exposure to noise at source, and in the United Kingdom a limit for exposure has been set at 87 dB(A) averaged over an 8-h day or 140 dB(A) for any instantaneous impulse noise....

Chapter.  1181 words.  Illustrated.

Subjects: Occupational Medicine

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