Artikel
The "pull-back" technique for Nucleus 24 perimodiolar electrode insertion
Suche in Medline nach
Autoren
Veröffentlicht: | 31. Mai 2005 |
---|
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.