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Scalar localisation of peri-modiolar electrodes and speech perception outcomes

  • C Shaul (a1) (a2), A S Dragovic (a1), A K Stringer (a1), S J O'Leary (a1) (a2) and R J Briggs (a1) (a2)...
Abstract
Objective

To identify the intracochlear electrode position in cochlear implant recipients and determine the correlation to speech perception for two peri-modiolar electrode arrays.

Methods

Post-operative cone-beam computed tomography images of 92 adult recipients of the ‘CI512’ electrode and 18 adult recipients of the ‘CI532’ electrode were analysed. Phonemes scores were recorded pre-implantation, and at 3 and 12 months post-implantation.

Results

All CI532 electrodes were wholly within scala tympani. Of the 79 CI512 electrodes intended to be in scala tympani, 58 (73 per cent) were in scala tympani, 14 (17 per cent) were translocated and 7 (9 per cent) were wholly in scala vestibuli. Thirteen CI512 electrodes were deliberately inserted into scala vestibuli. Speech perception scores for post-lingual recipients were higher in the scala tympani group (69.1 per cent) compared with the scala vestibuli (54.2 per cent) and translocation (50 per cent) groups (p < 0.05). Electrode location outside of scala tympani independently resulted in a 10.5 per cent decrease in phoneme scores.

Conclusion

Cone-beam computed tomography was valuable for demonstrating electrode position. The rate of scala tympani insertion was higher in CI532 than in CI512 electrodes. Scala vestibuli insertion and translocation were associated with poorer speech perception outcomes.

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Copyright
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Corresponding author
Author for correspondence: Associate Professor Robert Briggs, Department of Otolaryngology, Royal Victorian Eye and Ear Hospital, East Melbourne, Victoria, Australia E-mail: rjbriggs@netspace.net.au Fax: +61 3 9650 2522
Footnotes
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Associate Professor R J Briggs takes responsibility for the integrity of the content of the paper

R J Briggs was The Journal of Laryngology & Otology 2017 Visiting Professor.

Footnotes
References
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The Journal of Laryngology & Otology
  • ISSN: 0022-2151
  • EISSN: 1748-5460
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