Dynamics in the Transimpedance Matrix and Electrically Evoked Compound Action Potentials in Cochlear Implant Users With a Lateral-Wall Electrode Array

A novel finding of this study was that the increased postoperative peakedness of the intracochlear electric field was correlated with the increased responsiveness of the auditory nerve in the basal section of the electrode array. The narrower and more peaked intracochlear electric field may be due to fibrous tissue formation around the electrode array. Aligned with the onset of electrical stimulation and the general time course of intracochlear fibrous tissue formation after cochlear implant surgery, a long-term increase in electrode impedances was found, which was more pronounced in the basal section of the array.