Migration and other electrode complications following cochlear implantation

Area of Science:

• Otolaryngology
• Neurosurgery
• Biomedical Engineering

Background:

• Cochlear implantation is a vital treatment for severe to profound hearing loss.
• Electrode-related complications, such as migration, can impact device efficacy.
• Accurate assessment of electrode position is crucial for successful outcomes.

Purpose of the Study:

• To investigate the incidence and characteristics of electrode migration and other complications in cochlear implant surgery.
• To identify factors associated with suboptimal electrode placement.
• To evaluate the impact of electrode type and fixation techniques on migration rates.

Main Methods:

• Retrospective review of cochlear implant surgeries performed between April 2019 and December 2021.
• Inclusion of adult and pediatric patients from a tertiary referral center.
• Exclusion of patients without post-operative imaging and those with split arrays.

Main Results:

• Of 299 implants, 9% showed suboptimal electrode position, with migration being a common cause for re-implantation.
• True migrations were exclusively observed in straight electrode arrays.
• Most patients with suboptimal placement had normal inner ear anatomy.

Conclusions:

• Electrode migration may be more prevalent than previously recognized, particularly with straight arrays.
• Current fixation techniques may not fully prevent migration.
• Pre-curved electrodes and standardized fixation methods could potentially decrease migration rates.