Objective:To evaluate incidence of interscalar excursions between round window (RW) and cochleostomy approaches for cochlear implant (CI) insertion. Methods:This was a retrospective case-comparison. Flat-panel CT (FPC...Objective:To evaluate incidence of interscalar excursions between round window (RW) and cochleostomy approaches for cochlear implant (CI) insertion. Methods:This was a retrospective case-comparison. Flat-panel CT (FPCT) scans for 8 CI users with Med-El standard length electrode arrays were collected. Surgical technique was identified by a combination of operative notes and FPCT imaging. Four cochleae underwent round win-dow insertion and 4 cochleae underwent cochleostomy approaches anterior and inferior to the round window. Results:In our pilot study, cochleostomy approaches were associated with a higher likeli-hood of interscalar excursion. Within the cochleostomy group, we found 29% of electrode contacts (14 of 48 electrodes) to be outside the scala tympani. On the other hand, 8.5%of the electrode contacts (4 of 47 electrodes) in the round window insertion group were extra-scalar to the scala tympani. These displacements occurred at a mean angle of occur-rence of 364? ? 133?, near the apex of the cochlea. Round window electrode displacements tend to localize at angle of occurrences of 400? or greater. Cochleostomy electrodes occurred at an angle of occurrence of 19?e490?.展开更多
文摘Objective:To evaluate incidence of interscalar excursions between round window (RW) and cochleostomy approaches for cochlear implant (CI) insertion. Methods:This was a retrospective case-comparison. Flat-panel CT (FPCT) scans for 8 CI users with Med-El standard length electrode arrays were collected. Surgical technique was identified by a combination of operative notes and FPCT imaging. Four cochleae underwent round win-dow insertion and 4 cochleae underwent cochleostomy approaches anterior and inferior to the round window. Results:In our pilot study, cochleostomy approaches were associated with a higher likeli-hood of interscalar excursion. Within the cochleostomy group, we found 29% of electrode contacts (14 of 48 electrodes) to be outside the scala tympani. On the other hand, 8.5%of the electrode contacts (4 of 47 electrodes) in the round window insertion group were extra-scalar to the scala tympani. These displacements occurred at a mean angle of occur-rence of 364? ? 133?, near the apex of the cochlea. Round window electrode displacements tend to localize at angle of occurrences of 400? or greater. Cochleostomy electrodes occurred at an angle of occurrence of 19?e490?.
