Cochlear Implantation after Canal Wall Down Mastoidectomy
WANG Zhenxiao
WANG Line
GONG shusheng
GAO Fenqi
Abstract：Objective To report methods and hearing outcomes of cochlear implantation in patients with severe or pro-found hearing loss who had received canal wall down mastoidectomy. Methods Five patients who had undergone canal wall down mastoidectomy from January 2014 to June 2015 received cochlear implantation through the round window with the bone groove made at the junction of inferior external auditory canal wall and facial ridge and the outer electrodes covered with bone paste and temporalis fascia. Surgical techniques and hearing rehabilitation outcomes at 6 months, such as CAP, SIR, MAIS and M-LNT, were reviewed. Results Implantation was successful in all 5 cases. Intraoperative findings included attic cholesteatoma (n=1) and ossified tissues in scala tympani (n=3). Patients reported clear auditory perception upon co-chlear implant switch-on at 30 days after operation. At 12 months (n=3) or 6 months (n=1) follow up, patients expressed sat-isfaction with the treatment. One case was lost to follow up. No complication occurred. Conclusion Patients with severe or profound hearing loss who have received canal wall down mastoidectomy can still be candidates for cochlear implantation once their ears stopped discharging, with the opportunity to achieve satisfactory hearing outcomes. Because of likely distort-ed anatomy, a skilled surgeon may be needed to avoid electrode implantation failure due to possible difficulties to find round window or identifying ossified scale tympani during surgery.
Keywords：Canal wall down mastoidectomyCochlear implantation
Publication Date：2016-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 620-624 )