Intraoperative Electrophysiologic Variations Caused by the Scalar Position of Cochlear Implant Electrodes

Otology & Neurotology : Official Publication of the American Otological Society, American Neurotology Society [and] European Academy of Otology and Neurotology
Philipp MittmannIngo Todt

Abstract

The position of cochlear implant (CI) electrodes in the cochlea is fundamental for the interaction between the implant and the neurons of the spiral ganglion. The scalar position of the electrode in the cochlea is assumed to be an important parameter for the clinical outcome. In our study, the intraoperative electrophysiologic characteristics in dependence of the position of CI electrodes in the scala tympani or in the scala vestibuli after scalar change should be determined. The intraoperative impedances and neural response telemetry (NRT) data of 23 patients implanted with a Nucleus Advance Contour (Cochlear Pty, Sydney, Australia) electrode were recorded. One CI surgeon and two radiologists evaluated the electrode array's position independently radiologically by flat-panel tomography. Results from 17 patients with the electrode positioned in the scala tympani and six patients with the electrode changing intraoperatively from the tympanic into the vestibular scala were retrospectively analyzed. We found a statistically significant difference with an NRT threshold-based ratio for the groups. An estimation of the (radiologically confirmed) scalar position based on the NRT ratio was possible retrospectively. The evaluation of sp...Continue Reading

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Citations

Jun 29, 2016·European Archives of Oto-rhino-laryngology : Official Journal of the European Federation of Oto-Rhino-Laryngological Societies (EUFOS) : Affiliated with the German Society for Oto-Rhino-Laryngology - Head and Neck Surgery·Philipp MittmannD Arweiler-Harbeck
Oct 27, 2016·The Annals of Otology, Rhinology, and Laryngology·Philipp MittmannFlorian Christov
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Jan 10, 2019·Otology & Neurotology : Official Publication of the American Otological Society, American Neurotology Society [and] European Academy of Otology and Neurotology·Norio YamamotoKoichi Omori
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Feb 23, 2020·Cochlear Implants International·Akira IshiyamaPaul Boyd
Apr 4, 2015·Otology & Neurotology : Official Publication of the American Otological Society, American Neurotology Society [and] European Academy of Otology and Neurotology·Philipp MittmannFrederike Hassepass
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Nov 6, 2020·Cochlear Implants International·Christian von MitzlaffChristof Röösli

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