Related Experiment Video
Updated: Mar 2, 2026
Performing Intracochlear Electrocochleography During Cochlear Implantation
Published on: March 8, 2022
Real-Time Intracochlear Electrocochleography Obtained Directly Through a Cochlear Implant
Michael S Harris1, William Jason Riggs, Kanthaiah Koka
1*Department of Otolaryngology-Head & Neck Surgery, Nationwide Children's Hospital, The Ohio State University Wexner Medical Center, Columbus, Ohio †Advanced Bionics Corporation, Valencia, California ‡Ear, Nose, and Throat, Hospital Italiano de Buenos Aires, Buenos Aires, Argentina §Department of Otolaryngology-Head & Neck Surgery, Vanderbilt University Medical Center, Nashville, Tennessee.
Recording electrophysiologic responses using cochlear implants during surgery offers a feasible method for real-time monitoring of cochlear physiology. This technique provides insights into cochlear micromechanics during electrode insertion, enhancing surgical outcomes.
Area of Science:
- Otoacoustic Emissions
- Auditory Neurophysiology
- Cochlear Implant Technology
Background:
- Minimizing intracochlear trauma during cochlear implantation is crucial for improving patient outcomes.
- Conventional cochlear implants record electrically evoked compound action potentials (eCAPs).
- Acoustically evoked potentials may offer greater sensitivity to physiological changes during electrode insertion.
Purpose of the Study:
- To evaluate the feasibility and efficacy of using cochlear implants to record electrophysiologic responses during device placement.
- To monitor cochlear physiology in real-time during and after electrode insertion.
- To investigate intracochlear electrocochleography (ECochG) for assessing cochlear micromechanics.
Main Methods:
- Intracochlear ECochG was recorded from the cochlear implant electrode array in 14 subjects during surgery.
- A long acquisition time (54.5 ms) was used to capture potentials from the apical cochlear region (125 and 500 Hz).
- Two distinct intracochlear processing methods were compared for electrophysiologic data acquisition.
Main Results:
- Measurable intracochlear ECochG responses were obtained from all participants.
- First harmonic distortions, including cochlear microphonic and auditory nerve neurophonic, generally increased with electrode insertion.
- Response amplitude varied with the recording electrode location and stimulation frequency, demonstrating sensitivity to surgical manipulation.
Conclusions:
- Intracochlear ECochG recorded via the cochlear implant electrode array is a highly feasible technique.
- This method provides valuable insights into cochlear micromechanics during cochlear implant electrode placement.
- Real-time monitoring of cochlear physiology during surgery can potentially improve surgical precision and patient outcomes.
