The University of Southampton
University of Southampton Institutional Repository

Evaluation of bilaterally implanted adult subjects with the nucleus(r) 24 cochlear implant system

Ramsden, Richard, Greenham, Paula, O'Driscoll, Martin, Mawman, Deborah, Proops, David, Craddock, Louise, Fielden, Claire, Graham, John, Meerton, Leah, Verschuur, Carl, Toner, Joseph, McAnnallen, Cecilia, Osborne, Jonathan, Doran, Maire, Gray, Roger and Pickerill, Margaret (2005) Evaluation of bilaterally implanted adult subjects with the nucleus(r) 24 cochlear implant system Otology & Neurotology, 26, (5), pp. 988-98. (doi:10.1097/01.mao.0000185075.58199.22).

Record type: Article


Objective: To evaluate the speech perception benefits of bilateral implantation for subjects who already have one implant.
Study Design: Repeated measures.
Patients: Thirty adult cochlear implant users who received their second implant from 1 to 7 years with a mean of 3 years after their first device. Ages ranged from 29 to 82 years with a mean of 57 years.
Setting: Tertiary referral centers across the United Kingdom.
Main Outcome Measures: Monosyllabic consonant-nucleus-consonant words and City University of New York sentences in quiet with coincident speech and noise and with the noise spatially separated from the speech by +/-90[degrees].
Results: At 9 months, results showed the second ear in noise was 13.9 +/- 5.9% worse than the first ear (p < 0.001); a significant binaural advantage of 12.6 +/- 5.4% (p < 0.001) over the first ear alone for speech and noise from the front; a 21 +/- 6% (p < 0.001) binaural advantage over the first ear alone when noise was ipsilateral to the first ear; no binaural advantage when noise was contralateral to the first ear.
Conclusions: There is a significant bilateral advantage of adding a second ear for this group. We were unable to predict when the second ear would be the better performing ear, and by implanting both ears, we guarantee implanting the better ear. Sequential implantation with long delays between ears has resulted in poor second ear performance for some subjects and has limited the degree of bilateral benefit that can be obtained by these users. The dual microphone does not provide equivalent benefit to bilateral implants.

PDF 28306.pdf - Version of Record
Restricted to Repository staff only
Download (2MB)

More information

Published date: September 2005
Organisations: Human Sciences Group


Local EPrints ID: 28306
ISSN: 1531-7129
PURE UUID: 3f1b1b96-1921-49ce-8df7-844a7ed990f5

Catalogue record

Date deposited: 28 Apr 2006
Last modified: 17 Jul 2017 16:02

Export record



Author: Richard Ramsden
Author: Paula Greenham
Author: Martin O'Driscoll
Author: Deborah Mawman
Author: David Proops
Author: Louise Craddock
Author: Claire Fielden
Author: John Graham
Author: Leah Meerton
Author: Carl Verschuur
Author: Joseph Toner
Author: Cecilia McAnnallen
Author: Jonathan Osborne
Author: Maire Doran
Author: Roger Gray
Author: Margaret Pickerill

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton:

ePrints Soton supports OAI 2.0 with a base URL of

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.