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Electrophysiologic Detection of Electrode- and Tipfoldovers in perimodiolar CI-Electrode Arrays
18 April 2018 (online)
The exact position of the CI electrode array within the scala tympani is essential for a satisfying audiological outcome. If the electrode array folds over the result will be a worse hearing outcome. The intracochlear position can be determined radiological either intra- or postoperative. The aim of our study was to detect intraoperative electrophysiologic characteristics to identify and characterize the electrode foldover.
Material and Methods:
In a retospective setup patients which showed postoperative perimodiolar electrode- and tipfoldovers, at three tertiary referral centers, were included. The ponit of the foldover was detected, characterized and the intraoperative Auto-NRTs were evaluated in terms of abnormality.
Electrophysiologic abnormalities were detected and showed specifics in terms of electrode dimensions and direction of the foldover. Voluminous electrodes showed greater electrophysiologic variability whereas slim electrodes are less conspicuous.
The cochleaimplantation for hearing impaired patients with bilateral and unilateral deafness has become a major role in modern auditory rehabiliation. Perimodiolar electrode arrays may fold over during the insertion and hence have a negative influence on the audiological outcome as well as on vertigo and facial costimulation. Elekcrophysiologic voluminous and slim elelctrode arrays show certain specifics. Nevertheless dead regions of the spiral ganglion have to be kept in mind.