Importance of Perimodiolar Electrode Position for Psychoacoustic Discrimination in Cochlear Implantation

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Hypothesis:Modiolar proximity of the cochlear implant electrodes and low impedance values have a positive effect on electrical pitch discrimination.Background:The proximity of the cochlear electrode to the modiolar wall can determine changes in tissue and fluid environment. With the onset of soft-surgery techniques, the trauma caused during surgery has been reduced, minimizing fibrous growth.Methods:Computed tomography-scan measurements of electrode-inner wall distance and psychoacoustic electrode discrimination tests were done. Neural Response Telemery and impedance data were used in the study.Results:It was found that patients fitted with perimodiolar arrays have lower impedance values and smaller electrode-inner wall distances than those fitted with straight arrays. These variables were significantly correlated to electrode discrimination. It was found that a closer distance to the modiolus also results in better electrode discrimination.Conclusion:Perimodiolar electrodes could be a better solution in terms of pitch discrimination both because they are closer to the modiolus and because their impedance is lower.

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