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Long-Term Asymmetric Hearing Affects Cochlear Implantation Outcomes Differently in Adults with Pre- and Postlingual Hearing Loss
Linköping University, Department of Behavioural Sciences and Learning. Linköping University, Faculty of Arts and Sciences. Macquarie University, Australia; HEARing Cooperat Research Centre, Australia; SCIC Cochlear Implant Program, Australia.
Macquarie University, Australia; HEARing Cooperat Research Centre, Australia.
HEARing Cooperat Research Centre, Australia; University of Melbourne, Australia; Royal Victorian Eye and Ear Hospital, Australia.
Linköping University, Department of Behavioural Sciences and Learning, Disability Research. Linköping University, Faculty of Arts and Sciences. Region Östergötland, Anaesthetics, Operations and Specialty Surgery Center, Department of Otorhinolaryngology in Linköping. Linköping University, The Swedish Institute for Disability Research.
2015 (English)In: PLoS ONE, ISSN 1932-6203, Vol. 10, no 6, e0129167Article in journal (Refereed) Published
Abstract [en]

In many countries, a single cochlear implant is offered as a treatment for a bilateral hearing loss. In cases where there is asymmetry in the amount of sound deprivation between the ears, there is a dilemma in choosing which ear should be implanted. In many clinics, the choice of ear has been guided by an assumption that the reorganisation of the auditory pathways caused by longer duration of deafness in one ear is associated with poorer implantation outcomes for that ear. This assumption, however, is mainly derived from studies of early childhood deafness. This study compared outcomes following implantation of the better or poorer ear in cases of long-term hearing asymmetries. Audiological records of 146 adults with bilateral hearing loss using a single hearing aid were reviewed. The unaided ear had 15 to 72 years of unaided severe to profound hearing loss before unilateral cochlear implantation. 98 received the implant in their long-term sound-deprived ear. A multiple regression analysis was conducted to assess the relative contribution of potential predictors to speech recognition performance after implantation. Duration of bilateral significant hearing loss and the presence of a prelingual hearing loss explained the majority of variance in speech recognition performance following cochlear implantation. For participants with post-lingual hearing loss, similar outcomes were obtained by implanting either ear. With prelingual hearing loss, poorer outcomes were obtained when implanting the long-term sound-deprived ear, but the duration of the sound deprivation in the implanted ear did not reliably predict outcomes. Contrary to an apparent clinical consensus, duration of sound deprivation in one ear has limited value in predicting speech recognition outcomes of cochlear implantation in that ear. Outcomes of cochlear implantation are more closely related to the period of time for which the brain is deprived of auditory stimulation from both ears.

Place, publisher, year, edition, pages
PUBLIC LIBRARY SCIENCE , 2015. Vol. 10, no 6, e0129167
National Category
Basic Medicine
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URN: urn:nbn:se:liu:diva-120052DOI: 10.1371/journal.pone.0129167ISI: 000355701600092PubMedID: 26043227OAI: oai:DiVA.org:liu-120052DiVA: diva2:839992
Note

Funding Agencies|Macquarie University Research Excellence Scheme; HEARing CRC, under Cooperative Research Centres Program - Business Australia; Linnaeus Centre HEAD, The Swedish Institute for Disability Research

Available from: 2015-07-06 Created: 2015-07-06 Last updated: 2015-07-06

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Boisvert, IsabelleLyxell, Björn
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Department of Behavioural Sciences and LearningFaculty of Arts and SciencesDisability ResearchDepartment of Otorhinolaryngology in LinköpingThe Swedish Institute for Disability Research
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