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Cochlear implantation in cochlear otosclerosis.
A H Marshall1, N Fanning, S Symons
1Department of Otolaryngology--Head and Neck Surgery, Sunnybrook and Women's College Health Sciences Centre, Toronto, Ontario, Canada. ahmarshall@rogers.com
The Laryngoscope
|October 14, 2005
Summary
Cochlear implantation outcomes in otosclerosis are comparable to controls, even with prior surgery. Severe otosclerosis poses a risk of facial nerve stimulation, particularly with specific electrode types.
Area of Science:
- Otolaryngology
- Neurosurgery
- Medical Imaging
Background:
- Otosclerosis, a bone disease affecting the otic capsule, can complicate cochlear implantation.
- Previous surgery and the extent of otosclerosis may impact implant performance.
Purpose of the Study:
- To correlate cochlear implant performance in otosclerosis patients with control groups.
- To assess the impact of otic capsule involvement severity and prior ipsilateral surgery on implant outcomes.
- To evaluate programming issues and their relation to otosclerosis.
Main Methods:
- A retrospective case-controlled study of 30 individuals with otosclerosis undergoing cochlear implantation.
- High-resolution computed tomography (HRCT) scans graded for otosclerosis severity.
- Comparison of implant performance, programming visits, and electrode deactivations with matched controls.
Main Results:
- Implant performance in otosclerosis patients did not differ significantly from controls.
- Prior ipsilateral surgery did not affect implant performance.
- Programming difficulties and electrode deactivations were comparable between groups.
- Facial nerve stimulation occurred exclusively in severe otosclerosis (grade 3) with non-modiolar hugging electrodes.
Conclusions:
- Patients with otosclerosis can expect similar cochlear implant benefits as non-otosclerosis patients, irrespective of prior surgery or disease severity.
- Severe otosclerosis (grade 3) presents a significant risk for facial nerve stimulation, especially with non-modiolar hugging electrodes.