CC BY-NC-ND 4.0 · Laryngorhinootologie 2018; 97(S 02): S186
DOI: 10.1055/s-0038-1640357
Poster
Otologie: Otology

Cochlear Implantation in post-meningitic children – correlation between electrode impedances, implant charge and auditory results?

V Helmstädter
1   HNO-Klinik der MHH, Hannover
,
A Büchner
2   Deutsches Hörzentrum Hannover, Hannover
,
E Kludt
2   Deutsches Hörzentrum Hannover, Hannover
,
T Lenarz
1   HNO-Klinik der MHH, Hannover
,
M Durisin
1   HNO-Klinik der MHH, Hannover
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    Introduction:

    Bacterial meningitis can cause a labyrinthitis. Consequences often are intracochlear alterations like soft tissue or bone neoformation. Increased impedances and higher implant charge may result, which will complicate the rehabilitation with cochlear implants. This retrospective case-control-study aimed to find correlations between morphologic, electric and functional parameters.

    Methods:

    The study group included children, who lost hearing due to a bacterial meningitis (n = 35). Using preoperative computed tomography and intraoperative findings we grouped into 'unchanged cochleae', 'obliterated cochlea' and in 'ossified cochleae'. Control group children suffered from congenital deafness (n = 16) and presented with normal cochleae. Postoperatively we measured impedances and stimulation charge and performed hearing tests a various time points.

    Results:

    Control group patients showed a mean impedance of 6.3 kΩ and the mean charge applied was 19 nC. The study group averaged at 7.9 kΩ and 24.6 nC respectively. Patients with ossified cochleae had increased values of 8.6 kΩ and 29.7 nC. The control group reached a monosyllabic word understanding of 74% and the study group of 58%. Patients with ossified cochleae reached 36%.

    Conclusions:

    Higher impedances and increased charge in post-meningitic patients suggest ossified cochleae. Whether this is the only reason for a worse word understanding must be found out in further studies.


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    No conflict of interest has been declared by the author(s).

    Dr. med. Victor Helmstädter
    HNO-Klinik der MHH,
    Carl-Neuberg-Str. 1, 30625,
    Hannover

    Publication History

    Publication Date:
    18 April 2018 (online)

    © 2018. The Author(s). This is an open access article published by Thieme under the terms of the Creative Commons Attribution-NonDerivative-NonCommercial-License, permitting copying and reproduction so long as the original work is given appropriate credit. Contents may not be used for commercial purposes, or adapted, remixed, transformed or built upon. (https://creativecommons.org/licenses/by-nc-nd/4.0/).

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