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  Patronage of the Polish Society of Audiology and Phoniatrics

vol 13. no 2. June 2014  

 Review articles
Otoacoustic emissions in noise-induced hearing loss monitoring
Piotr Kotyło, Mariola Śliwińska-Kowalska

an objective and sensitive method of detecting preclinical
damage of the cochlea due to noise exposure and monitoring
early signs of noise-induced hearing loss (NIHL). Over the last
years, their role in hearing conservation programs (HCPs) has
been explored by many groups of researchers worldwide.
It has been shown that OAEs are on average lower in noiseexposed
groups than in non-exposed individuals, even though
audiomeric hearing threshold is normal. Moreover, low-level
OAEs can indicate an increased risk of future hearing loss due
to exposure to noise in workplace. This finding is important as
a potential preventive measure to be used in the HCPs.
Among two types of evoked OAEs routinely applied in the
clinic, transient-evoked otoacoustic emission (TEOAE) has been
shown to be more sensitive for detecting subclinical changes
in the cochlea than distortion-product otoacoustic emission
(DPOAE). However, TEOAE is not recommended for NIHL
screening because of a high false-positive rate and its absence
in substantial number of ears with mild hearing loss. As in NIHL
monitoring, DPOAE seems to be more suitable than TEOAE
because of greater sensitivity to cochlear dysfunction in high
frequency region. However the results of recently published
longitudinal studies are equivocal in respect of showing the
advantage of DPOAE over standard audiometry in detecting
effects of noise on hearing. Despite the lack of scientific
consensus on OAEs validity, in some countries OAEs start to
replace regular audiometric examination in preclinical NIHL

keywords: TEOAE, DPOAE, czasowe przesunięcie progu słuchu, trwałe przesunięcie progu słuchu, parametry,TEOAE, DPOAE, temporary threshold shift, permanent threshold shift, parameters

pages: from 67 to 76

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