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Table of Contents
Vol. 9, No. 3, 2004
Issue release date: May – June
Section title: Original Paper
Audiol Neurootol 2004;9:163–172
(DOI:10.1159/000077267)

Effects of Insertion Depth of Cochlear Implant Electrodes upon Speech Perception

Yukawa K.a,c · Cohen L.b · Blamey P.a · Pyman B.a · Tungvachirakul V.a · O’Leary S.a
aDepartment of Otolaryngology, University of Melbourne, Royal Victorian Eye and Ear Hospital, and bCRC for CochlearImplant and Hearing Aid Innovation, Melbourne, Australia; cHead and Neck Surgery, Department of Otolaryngology, Tokyo Medical University, Tokyo, Japan

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Article / Publication Details

First-Page Preview
Abstract of Original Paper

Received: February 28, 2003
Accepted: November 20, 2003
Published online: April 15, 2004
Issue release date: May – June

Number of Print Pages: 10
Number of Figures: 6
Number of Tables: 3

ISSN: 1420-3030 (Print)
eISSN: 1421-9700 (Online)

For additional information: http://www.karger.com/AUD

Abstract

Objective: To investigate whether the insertion depth of a cochlear implant array affects postoperative speech perception. Design: The subjects were 48 postlingually deaf adults who received either the Nucleus 22 or the Nucleus 24 cochlear implant with a straight array. A postoperative radiograph of the cochlear electrode was used to estimate insertion depth, as either the angle of the electrode tip (angle) or the intracochlear length of the electrode (length). Other estimates of insertion depth included the numbers of active electrodes and channels used by the speech processor. Electrode depth, together with the duration of deafness, hearing aid usage, pre-operative speech perception score and pre-operative pure-tone averages were independent variables in a forward stepwise multiple regression analysis, where the dependent variables were postoperative CNC words and CNC phonemes. Results: Duration of deafness and insertion depth (angle, insertion length or active electrodes) were the predictive variables for CNC words or CNC phonemes. Angle was the best ‘depth-related’ predictor of postoperative speech perception. An even clearer relationship was found between CUNY sentences in noise and angle, in a subset of 26 patients. Conclusion: Depth of electrode insertion affects postoperative speech perception.

© 2004 S. Karger AG, Basel


Article / Publication Details

First-Page Preview
Abstract of Original Paper

Received: February 28, 2003
Accepted: November 20, 2003
Published online: April 15, 2004
Issue release date: May – June

Number of Print Pages: 10
Number of Figures: 6
Number of Tables: 3

ISSN: 1420-3030 (Print)
eISSN: 1421-9700 (Online)

For additional information: http://www.karger.com/AUD


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