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Related Experiment Video

Updated: May 8, 2026

Performing Repeated Intraoperative Impedance Telemetry Measurements during Cochlear Implantation

Performing Repeated Intraoperative Impedance Telemetry Measurements during Cochlear Implantation

Published on: August 4, 2023

Impedance changes in chronically implanted and stimulated cochlear implant electrodes.

Carrie Newbold, Silvana Mergen, Rachael Richardson

Cochlear Implants International

|September 4, 2013

Summary

Electrical stimulation rapidly reduces cochlear implant electrode impedance, primarily by altering polarization impedance at the electrode surface. This effect is observed even years after implantation and reverses upon cessation of stimulation.

Keywords:

Access resistance Cochlear implant Electrical stimulation Electrode impedance Polarization impedance

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Last Updated: May 8, 2026

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Published on: June 21, 2024

Area of Science:

Biomedical Engineering
Neuroscience
Otolaryngology

Background:

Electrode impedance in cochlear implants typically increases post-implantation.
Electrical stimulation can transiently reduce this impedance.

Purpose of the Study:

To measure in vivo changes in access resistance and polarization impedance.
To record the time course of impedance changes during electrical stimulation.

Main Methods:

Impedance measurements were taken in four cats with 6-month cochlear implant experience.
Impedance was also measured in three human cochlear implant recipients with 1.5-5 years of experience.

Main Results:

Electrode impedance decreased by 20% (cats) and 5% (humans) within 15-30 minutes of stimulation.
The majority of impedance reduction was due to decreased polarization impedance.
Impedance returned to baseline levels within 6-12 hours after stimulation cessation.

Conclusions:

Stimulus-induced impedance reduction is rapid and occurs in chronic cochlear implant models.
Findings suggest electrical stimulation modifies the electrode surface, not cochlear tissue.
This has implications for optimizing cochlear implant performance and longevity.