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Estimating Performance Using Tonotopic Measurements of Intracochlear Electrocochleography: Comparison of Lateral Wall and Perimodiolar Arrays.

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Updated: Feb 3, 2026

Performing Intracochlear Electrocochleography During Cochlear Implantation
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Intracochlear Electrocochleography: Response Patterns During Cochlear Implantation and Hearing Preservation.

Christopher K Giardina1,2, Kevin D Brown1, Oliver F Adunka3

  • 1Department of Otolaryngology/Head and Neck Surgery, University of North Carolina at Chapel Hill, NC.

Ear and Hearing
|October 19, 2018
PubMed
Summary

Intracochlear electrocochleography (ECochG) during cochlear implantation monitors cochlear health. Response patterns vary by device, and considering phase, latency, and neural components aids hearing preservation prediction.

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Area of Science:

  • Otoacoustic Emissions and Electrophysiology
  • Neurosurgery and Biomedical Engineering

Background:

  • Intraoperative electrocochleography (ECochG) via cochlear implant (CI) is explored to minimize surgical trauma and preserve hearing.
  • Understanding ECochG signal complexity, influenced by hearing loss etiology, is crucial for accurate intraoperative monitoring.

Purpose of the Study:

  • To characterize intracochlear ECochG responses during CI electrode insertion across different array types.
  • To correlate ECochG measures with hearing preservation outcomes.

Main Methods:

  • ECochG was recorded at the round window and intracochlearly during CI insertion in 36 human subjects.
  • Responses to 90 dB nHL tone bursts were analyzed, correlating audiometry with intraoperative recordings in 12 subjects undergoing hearing preservation surgery.

Main Results:

  • Successful intracochlear recordings were obtained in 28 subjects; 8 cases were affected by line noise.
  • Modiolar arrays showed response drops post-stylet removal, while lateral wall arrays typically peaked at deeper insertions.
  • Four response patterns were observed; hearing preservation was successful in 9/12 subjects, with improved prediction using phase, latency, and neural components.

Conclusions:

  • Intracochlear ECochG monitoring during CI surgery is feasible and shows device-dependent response patterns.
  • Magnitude changes alone are insufficient for predicting hearing preservation; phase, latency, and neural components offer better insights.
  • Correlation between ECochG magnitude and hearing threshold changes highlights the role of individual cochlear health.