Margaret T Dillon1,2, Michael W Canfarotta1, Emily Buss1, Brendan P O'Connell1. 1. Department of Otolaryngology/Head and Neck Surgery, School of Medicine. 2. Division of Speech & Hearing, Department of Allied Health Sciences, University of North Carolina at Chapel Hill, North Carolina.
Abstract
OBJECTIVE: To compare acute speech recognition with a cochlear implant (CI) alone or electric-acoustic stimulation (EAS) device for place-based maps calculated with an organ of Corti (OC) versus a spiral ganglion (SG) frequency-to-place function. PATIENTS: Eleven adult CI recipients of a lateral wall electrode array. INTERVENTION: Postoperative imaging was used to derive place-based maps calculated with an OC versus SG function. MAIN OUTCOME MEASURE: Phoneme recognition was evaluated at initial activation with consonant-nucleus-consonant (CNC) words presented using an OC versus a SG place-based map. RESULTS: For the 9 CI-alone users, there was a nonsignificant trend for better acute phoneme recognition with the SG map (mean 18 RAUs) than the OC map (mean 9 RAUs; p = 0.071, 95% CI [≤-1.2]). When including the 2 EAS users in the analysis, performance was significantly better with the SG map (mean 21 RAUs) than the OC map (mean 7 RAUs; p = 0.019, 95% CI [≤-6.2]). CONCLUSIONS: Better phoneme recognition with the SG frequency-to-place function could indicate more natural tonotopic alignment of information compared with the OC place-based map.A prospective, randomized investigation is currently underway to assess longitudinal outcomes with place-based mapping in CI-alone and EAS devices using the SG frequency-to-place function.
OBJECTIVE: To compare acute speech recognition with a cochlear implant (CI) alone or electric-acoustic stimulation (EAS) device for place-based maps calculated with an organ of Corti (OC) versus a spiral ganglion (SG) frequency-to-place function. PATIENTS: Eleven adult CI recipients of a lateral wall electrode array. INTERVENTION: Postoperative imaging was used to derive place-based maps calculated with an OC versus SG function. MAIN OUTCOME MEASURE: Phoneme recognition was evaluated at initial activation with consonant-nucleus-consonant (CNC) words presented using an OC versus a SG place-based map. RESULTS: For the 9 CI-alone users, there was a nonsignificant trend for better acute phoneme recognition with the SG map (mean 18 RAUs) than the OC map (mean 9 RAUs; p = 0.071, 95% CI [≤-1.2]). When including the 2 EAS users in the analysis, performance was significantly better with the SG map (mean 21 RAUs) than the OC map (mean 7 RAUs; p = 0.019, 95% CI [≤-6.2]). CONCLUSIONS: Better phoneme recognition with the SG frequency-to-place function could indicate more natural tonotopic alignment of information compared with the OC place-based map.A prospective, randomized investigation is currently underway to assess longitudinal outcomes with place-based mapping in CI-alone and EAS devices using the SG frequency-to-place function.
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