High-frequency Cochlear Nerve Deficit Region: Relationship With Deaf Duration and Cochlear Implantation Performance in Postlingual Deaf Adults.

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To analyze the changes of cochlear nerve diameter and the presence of a cochlear nerve deficit at a high-frequency region and investigate their effects on cochlear implant (CI) performance in postlingual deaf adults.Retrospective.Tertiary care academic center.Eighty-three postlingual deaf adults with no labyrinthine anomalies or cognitive deficits who received a CI with perimodiolar electrodes from a single manufacturer.We evaluated the changes of cochlear nerve diameter and the presence of a “tail sign,” defined as identifiable nerve fibers originating from the far basal turn of the cochlea, which represents the presence of cochlear nerve at a high-frequency region in magnetic resonance imaging, on monosyllabic word recognition scores.The cochlear nerve diameter showed a positive correlation with word recognition scores (maximum diameter, R2 = 0.26, p 

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Authors: Yehree Kim, Jee Yeon Lee, Min Young Kwak, Jin Taek Park, Woo Seok Kang, Joong Ho Ahn, Jong Woo Chung, Hong Ju Park