gms | German Medical Science

Fourth International Symposium and Workshops: Objective Measures in Cochlear Implants

Medical University of Hannover

01.06. bis 04.06.2005, Hannover

The "pull-back" technique for Nucleus 24 perimodiolar electrode insertion

Meeting Abstract

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  • corresponding author I. Todt - Department of Otolaryngology at ukb, Hospital of the University of Berlin (Charité Medical School)
  • D. Basta - Department of Otolaryngology at ukb, Hospital of the University of Berlin (Charité Medical School)
  • A. Ernst - Department of Otolaryngology at ukb, Hospital of the University of Berlin (Charité Medical School)

Medical University of Hannover, Department of Otolaryngology. Fourth International Symposium and Workshops: Objective Measures in Cochlear Implants. Hannover, 01.-04.06.2005. Düsseldorf, Köln: German Medical Science; 2005. Doc05omci056

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Veröffentlicht: 31. Mai 2005

© 2005 Todt et al.
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Gliederung

Text

Introduction

To observe the influence of electrode pull-back after cochlear implant insertion of Nucleus- 24 perimodiolar electrodes.

Materials and Methods

In a prospective, intraoperative study, we analyzed the impedances, NRT responses and the spread of excitation after cochlear implant electrode insertion and compared these data to those obtained after a subsequent, controlled pull-back of the electrode. Postoperative depth of electrode insertion was controlled by X-ray.

Results

After a controlled pull-back, a significant decrease of the spread of excitation at the stimuli electrodes 5, 10, 15 and a non-significant decrease at stimuli electrode 20 compared to the recordings after the primary, normal insertion procedure was found. The mean ECAP amplitude was increased with an apical-to-basal tendency. Impedances remained unchanged by the pull-back. Mean insertion depth at the postoperative X- ray control was 372° (± 10.2).

Conclusions

Controlled CI electrode pull-back is a technique which optimizes objective intraoperative electrophysiological recordings in patients implanted with a Nucleus-24 perimodiolar cochlear implant by a greater approximation of the electrode to the modiolus.