Early Outcomes With a Slim, Modiolar Cochlear Implant Electrode Array

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Objective:To describe outcomes from cochlear implantation with a new, slim modiolar electrode array.Study Design:Retrospective cohort study.Setting:Tertiary referral centers.Patients:Adult cochlear implant candidates.Interventions:Cochlear implantation with CI532 (Cochlear Corp).Main Outcome Measures:Pre- and postoperative speech perception scores, operative details, and postoperative computed tomography (CT) reconstructions of array location.Results:One hundred seventeen patients are implanted to date. There were eight tip rollovers identified with intraoperative x-ray and resolved with reinsertion. An additional rollover was identified on postoperative CT. CT reconstructions in 17 of 23 patients showed complete scala tympani placement with a wrap factor of 58% (range 53–64%) and a mean insertion angle of 406 degrees (range 360–452 degrees). Three implants demonstrated array translocation with electrodes in the scala vestibuli. Consonant-nucleus-consonant word scores improved from 10% preoperatively to 48% at 3 months postoperatively. Pure-tone thresholds were preserved postoperatively in 37 to 52% of patients across frequencies from 250 to 4000 Hz. Functional pure-tone thresholds (≤80 dB) were recorded in 9 to 25% of patients.Conclusion:CI532 array insertion results in consistent scala tympani location and provides expected audiologic performance. Initial hearing preservation results are not consistent with current electro-acoustic arrays.

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