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Updated: May 22, 2026

Performing Repeated Intraoperative Impedance Telemetry Measurements during Cochlear Implantation

Performing Repeated Intraoperative Impedance Telemetry Measurements during Cochlear Implantation

Published on: August 4, 2023

Electrode migration in cochlear implant patients: not an exception.

Kim S van der Marel¹, Berit M Verbist, Jeroen J Briaire

¹Department of Otorhinolaryngology, Leiden University Medical Center, Leiden, The Netherlands.

Audiology & Neuro-Otology

|May 26, 2012

Summary

Cochlear implant electrode migration occurred in 29% of patients, affecting both those with and without performance complaints. Implant type influenced migration risk, but insertion depth did not.

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Area of Science:

Otolaryngology
Biomedical Engineering
Neurosurgery

Background:

Cochlear implantation is a common treatment for severe to profound hearing loss.
Electrode migration can potentially impact device performance and patient outcomes.

Purpose of the Study:

To investigate the incidence of cochlear implant electrode migration.
To determine if electrode migration correlates with patient complaints or implant type.

Main Methods:

Retrospective case review of 35 cochlear implant patients.
CT scan analysis for electrode displacement (>1 mm considered migration).
Comparison between CII HiFocus1 and HiRes90K HiFocus1J implant types.

Main Results:

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Last Updated: May 22, 2026

Performing Repeated Intraoperative Impedance Telemetry Measurements during Cochlear Implantation

Performing Repeated Intraoperative Impedance Telemetry Measurements during Cochlear Implantation

Published on: August 4, 2023

Electrode migration detected in 10 patients (29%).

HiFocus1 implant type showed significantly less migration compared to HiRes90K HiFocus1J.

No correlation found between insertion depth and electrode migration.

Two migrations were identified in 5 patients scanned for performance issues.

Conclusions:

Cochlear implant electrode migration is a notable occurrence in this patient cohort.
Migration can happen irrespective of patient-reported symptoms.
Implant type is a significant factor in electrode migration risk.