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Semin Hear 2013; 34(01): 051-064
DOI: 10.1055/s-0032-1333151
Thieme Medical Publishers 333 Seventh Avenue, New York, NY 10001, USA.

Assistive Devices for Patients with Auditory Neuropathy: Hearing Aid Use

Rosamaria Santarelli
1   Department of Neuroscience, Service of Audiology and Phoniatrics, University of Padova, Padova, Italy
,
Roberta Rossi
1   Department of Neuroscience, Service of Audiology and Phoniatrics, University of Padova, Padova, Italy
,
Edoardo Arslan
1   Department of Neuroscience, Service of Audiology and Phoniatrics, University of Padova, Padova, Italy
› Author Affiliations
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Publication History

Publication Date:
29 January 2013 (online)

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Abstract

Auditory neuropathy (AN) is a hearing disorder characterized by disruption of temporal coding of acoustic signals in the auditory nerve resulting from lesions involving auditory nerve fibers, the inner hair cells, or their synapses with auditory nerve terminals. Disruption of auditory nerve discharge underlies both the absence of auditory brainstem responses (ABRs) and impairment of speech perception. AN may be related to genetic disorders or result from a wide range of other etiologies. It can be identified either as an isolated disorder (isolated AN) or associated with multisystem involvement (non-isolated AN). Effectiveness and choice of assistive devices depend crucially upon etiology, site of lesion, and stage of the disease. Cochlear implants constitute an effective rehabilitative tool able to restore speech perception in many patients with genetic AN, especially those affected by the isolated form of the disorder. Some children with isolated AN have proved to be good hearing aid users, showing satisfactory open-set speech perception abilities in the aided condition. Over 50% of children discharged from neonatal intensive care units showing the electrophysiological profile of AN (absent ABRs, presence of otoacoustic emissions) benefit from hearing aid use, the provision of amplification resulting in remarkable improvement in speech perception. It can be concluded that differences in cochlear implant outcome or hearing aid use in patients with AN are related to the pathophysiological mechanisms underlying alteration of auditory nerve discharge associated with individual etiologies.

Keywords

auditory neuropathy - hearing aids - cochlear implants - otoferlin - prematurity
 

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