Facial nerve stimulation in adult cochlear implant recipients with far advanced otosclerosis

Abstract Objectives The objective of this study was to predict occurrence of facial nerve stimulation (FNS) in cochlear implanted patients for far‐advanced otosclerosis (FAO) by correlating preoperative computed tomography (CT)‐scan data to FNS and to evaluate FNS impact on hearing outcomes. Methods Retrospective analysis on 91 ears (76 patients) implanted for FAO. Electrodes were straight (50%) or perimodiolar (50%). Demographic data, extension of otosclerosis on preoperative CT scan, occurrence of FNS, and speech performance were analyzed. Results Prevalence of FNS was 21% (19 ears). FNS appeared during the first month (21%), 1–6 months (26%), 6–12 months (21%), and over 1 year (32%) postimplantation. Cumulative incidence of FNS at 15 years was 33% (95% CI = [14–47%]). Extension of otosclerotic lesions on preimplantation CT‐scan was more severe in FNS ears compared to No‐FNS (p