전극이 전정에 삽입된 인공와우이식술 1예

Surgical complication related to an electrode array in cochlear implantation is rare; however, in cases with cochlear ossification after bacterial meningitis, the electrode array insertion can be problematic. The patient complained of an aggravated hearing impairment after bacterial meningitis. He was performed cochlear implantation. Both intraoperative neural response telemetry (NRT) and impedance telemetry results were normal. However, postoperative transorbital x-ray revealed only partial insertion of the electrode array. Four days after the surgery, he complained dizziness. Postoperative temporal bone CT showed malposition of the electrode array into the vestibule. Revision surgery was performed and a new electrode array was fully inserted after further drilling out into the cochleostomy window. Though intraoperative NRT and impedance telemetry are normal, misdirection of an electrode array can occur. Therefore, it should be considered that intraoperative radiologic examination is used after insertion of an electrode array for assessment of an electrode array location. (J Clinical Otolaryngol 2011;22:86–89)