Comparison of Scalar Location and Insertion Depth of Cochlear Implant Electrode Implanted Through The Round Window Versus Cochleostomy Approach

Salam, Seddik Abdel; Tayel, Shawky; Mehanna, Ahmed; Eid, Mohamed; Farouk, Walid
January 2013
Journal of International Advanced Otology;2013, Vol. 9 Issue 1, p30
Academic Journal
Objective: Compare the insertion depth and scalar location of cochlear implant (CI) electrode implanted through round window membrane (RWM) versus cochleostomy approach, using multislice computed tomography (CT). Materials and Methods: The study was conducted on twenty fresh human temporal bones. Ten were implanted through RWM approach and the other ten through cochleostomy using standard dummy CI electrode (MED-EL, Innsbruck, Austria). The CI electrodes were advanced till the point of first resistance then assessed using multislice CT. Results: The study showed no significant differences in insertion depths whether angular or linear in the two study groups. However the RWM approach was associated with statistically significant higher incidence of scala tympani (ST) placement compared to scala vestibuli (SV) placement. Also ST placements were associated with statistically significant lower insertion depth compared to SV placement. Conclusion: The present study suggests that, for hearing preservation cochlear implantation, advancing the CI electrode through the RWM till the point of first resistance is the recommend first choice whenever the anatomical orientation of the RWM allows.


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