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Mechanism underlying and prevention of electrode migration in cochlear implants
Jungho Ha1,2, Hannah Park1,2, Jisun Yang1,2
1Department of Otolaryngology, Ajou University School of Medicine, 164 World Cup-ro, Yeongtong-gu, Suwon, 16499, Gyeonggi-do, Republic of Korea.
Summary
Electrode migration after cochlear implantation (CI) can decrease hearing. A novel technique using bone paste and glue to secure straight electrodes in the mastoid cavity may prevent this complication.
Area of Science:
- Otolaryngology
- Neurosurgery
- Biomedical Engineering
Background:
- Electrode migration is a potential complication following cochlear implantation (CI).
- Understanding the clinical manifestations and mechanisms of electrode migration is crucial for prevention.
- Straight electrode types may be associated with a higher risk of migration.
Purpose of the Study:
- To investigate the clinical features, underlying mechanisms, and preventative strategies for electrode migration in CI patients.
- To share practical experience in managing and preventing this complication.
Main Methods:
- Retrospective review of 532 CI patients over 20 years at a single tertiary institution.
- Analysis of audiological data including pure-tone audiometry and speech recognition scores.
- Confirmation of electrode migration using imaging techniques like X-ray and CT scans.
Main Results:
- Four patients (0.75%) experienced electrode migration, all with straight electrode types.
- Symptoms included increased high-frequency thresholds and decreased speech intelligibility.
- Migration involved coiled or floating electrodes within the mastoid cavity.
- A novel prevention method involved securing electrodes with bone paste and glue.
Conclusions:
- Electrode migration can lead to hearing loss and may require revision surgery.
- Factors influencing migration include electrode position and the elasticity of straight electrodes.
- Surgeons must recognize risk factors and implement preventative measures to minimize electrode migration.
