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Updated: Apr 28, 2026

Performing Intracochlear Electrocochleography During Cochlear Implantation

Performing Intracochlear Electrocochleography During Cochlear Implantation

Published on: March 8, 2022

Intracochlear electrocochleography during cochlear implantation.

Nathan H Calloway¹, Douglas C Fitzpatrick, Adam P Campbell

¹Department of Otolaryngology, Head and Neck Surgery, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, U.S.A.

Otology & Neurotology : Official Publication of the American Otological Society, American Neurotology Society [And] European Academy of Otology and Neurotology

|June 4, 2014

Summary

This summary is machine-generated.

Intracochlear electrocochleography (ECoG) in cochlear implant recipients yields larger signals than round window recordings. This technique can monitor cochlear function during electrode insertion, improving data collection efficiency.

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Published on: June 21, 2024

Area of Science:

Otoacoustic Emissions
Auditory Electrophysiology
Neurosurgery

Background:

Electrophysiologic responses to acoustic stimuli are detectable in most cochlear implant (CI) patients via round window (RW) measurements.
Intracochlear recording sites may offer enhanced signal amplitude, improving electrocochleography (ECoG) sensitivity and clinical applicability.

Purpose of the Study:

Compare RW ECoG with intracochlear ECoG recordings.
Assess the utility of intracochlear ECoG for monitoring cochlear function during CI electrode insertion.

Main Methods:

Intraoperative ECoG recordings were performed at the RW and within the scala tympani in 26 CI recipients.
Stimuli included high-level tones (80-100 dB HL).
Recordings were also made during insertion of a temporary cochlear wall electrode in 8 subjects, analyzing harmonic amplitudes.

Main Results:

All subjects exhibited measurable extracochlear responses at the RW.
A larger intracochlear response was observed in 78% of cases, while 11% showed a smaller response.
Signal amplitudes generally increased with electrode insertion depth, notably between 15-20 mm from the RW.

Conclusions:

Intracochlear ECoG using acoustic stimuli is feasible in standard CI recipients.
The enhanced signal improves data acquisition speed and efficiency.
Increased signal amplitude with deeper insertion suggests proximity to apical generators, while decreases may indicate unfavorable geometry or trauma.