Audiology and Neurotology
Original Paper
Residual Hearing Thresholds in Cochlear Implantation and ReimplantationDi Nardo W. · Cantore I. · Cianfrone F. · Melillo P. · Rigante M. · Paludetti G.Institute of Otorhinolaryngology, Catholic University of the Sacred Heart, Rome, Italy
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Article / Publication Details
Received: July 19, 2006
Accepted: October 23, 2006
Published online: January 25, 2007
Issue release date: April 2007
Number of Print Pages: 5
Number of Figures: 2
Number of Tables: 2
ISSN: 1420-3030 (Print)
eISSN: 1421-9700 (Online)
For additional information: https://www.karger.com/AUD
Abstract
Implant and reimplantation surgery should be carried out with preservation of residual hearing. The aim of this study is to evaluate the effects of such a surgery on hearing threshold. We report the results on 40 patients, 20 males and 20 females, aged between 5 and 70 (mean 29) years, 16 pre-verbal and 24 post-verbal, with measurable pre-operative auditory thresholds. We used the following implants: Advanced Bionics, Med-El, Cochlear, and MXM Digisonic. Four of the patients underwent cochlear reimplantation owing to device failure. A complete insertion was obtained in all patients. Responses to pure-tone stimuli were evaluated in each ear in pre-implant conditions and 3 months after cochlear implant or reimplantation. The explantation was performed with minimal cochlear trauma and preservation of the explanted electrode integrity. 35% showed no change of the hearing threshold, 45% showed a slight worsening of the hearing threshold level in the implanted ear, and 20% had a total loss of residual hearing. Median increases of threshold levels were 10, 5, 10 and 3 dB HL respectively for 125, 250, 500 and 1 kHz. In the group of 4 patients who underwent cochlear reimplantation, 2 showed no variation of the hearing threshold, 1 preserved an appreciable hearing threshold, and 1 had a total loss of residual hearing. The data seem to suggest that hearing function is rather resistant to mechanical trauma during implant and reimplant surgery; the authors hypothesize a role for direct spiral ganglion activation under intense mechanical stimulation.
© 2007 S. Karger AG, Basel
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References
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Article / Publication Details
Received: July 19, 2006
Accepted: October 23, 2006
Published online: January 25, 2007
Issue release date: April 2007
Number of Print Pages: 5
Number of Figures: 2
Number of Tables: 2
ISSN: 1420-3030 (Print)
eISSN: 1421-9700 (Online)
For additional information: https://www.karger.com/AUD
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Copyright: All rights reserved. No part of this publication may be translated into other languages, reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying, recording, microcopying, or by any information storage and retrieval system, without permission in writing from the publisher.Drug Dosage: The authors and the publisher have exerted every effort to ensure that drug selection and dosage set forth in this text are in accord with current recommendations and practice at the time of publication. However, in view of ongoing research, changes in government regulations, and the constant flow of information relating to drug therapy and drug reactions, the reader is urged to check the package insert for each drug for any changes in indications and dosage and for added warnings and precautions. This is particularly important when the recommended agent is a new and/or infrequently employed drug.
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