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Updated: Dec 11, 2025

Performing Intracochlear Electrocochleography During Cochlear Implantation

Performing Intracochlear Electrocochleography During Cochlear Implantation

Published on: March 8, 2022

Simultaneous Intra- and Extracochlear Electrocochleography During Electrode Insertion.

Adrian Dalbert^1,2, Leanne Sijgers^1,2, Julian Grosse^1,2

¹University of Zurich, Zurich, Switzerland.

Ear and Hearing

|August 23, 2020

Summary

This summary is machine-generated.

Intracochlear electrocochleography (ECochG) signals during cochlear implant electrode insertion are larger and more variable than extracochlear signals. These changes, related to electrode position, may help detect cochlear trauma.

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Area of Science:

Otoacoustic Emissions and Electrophysiology
Neurosurgery and Biomedical Engineering

Background:

Cochlear implantation requires precise electrode placement.
Understanding intraoperative electrocochleography (ECochG) signals is crucial for assessing cochlear function during surgery.

Purpose of the Study:

To correlate intra- and extracochlear ECochG signals during electrode insertion and removal.
To track ECochG signal changes during insertion/removal and correlate them with preoperative hearing.
To test the hypothesis that intracochlear ECochG changes are not reflected in extracochlear recordings.

Main Methods:

Simultaneous intra- and extracochlear ECochG recordings during stepwise electrode insertion/removal in human cochlear implant recipients.
Acoustic stimulus: 500 Hz tone burst at 110-130 dB SPL.
Custom-made electrode used for recordings.

Main Results:

Intracochlear ECochG responses were consistently larger (mean 14 dB difference) than extracochlear responses.
Intracochlear signals showed significant amplitude and phase variations during insertion, unlike stable extracochlear signals.
These intracochlear changes were reversible upon electrode retraction.
Weak correlations were found between preoperative hearing and ECochG amplitude changes.

Conclusions:

Intracochlear ECochG provides larger signals and reveals dynamic changes during electrode insertion not seen with extracochlear recordings.
Observed intracochlear signal variations are likely due to electrode movement.
Future modeling of these changes could aid in detecting cochlear trauma during implantation.