Related Experiment Video
Updated: Nov 13, 2025
09:10
Performing Intracochlear Electrocochleography During Cochlear Implantation
Published on: March 8, 2022
4.7K
Simultaneous Intra- and Extracochlear Electrocochleography During Cochlear Implantation to Enhance Response
Leanne Sijgers1,2, Flurin Pfiffner1,2, Julian Grosse1,2
1University of Zurich, Zurich, Switzerland.
Trends in Hearing
|March 12, 2021
Summary
Electrocochleography (ECochG) can monitor cochlear function during implantation. Comparing intracochlear and extracochlear ECochG signals helps differentiate traumatic from atraumatic changes, improving surgical outcomes.
Area of Science:
- Otoacoustic Emissions
- Auditory Neurophysiology
- Surgical Monitoring
Background:
- Electrocochleography (ECochG) shows promise for real-time cochlear function monitoring during cochlear implantation.
- Interpreting intra-operative ECochG is challenging due to electrode movement and signal generator variability, leading to conflicting results and hindering clinical adoption.
Purpose of the Study:
- To investigate if simultaneous intracochlear and extracochlear ECochG recordings can differentiate traumatic from atraumatic signal changes.
- To improve the interpretability of ECochG during cochlear implantation surgery.
Main Methods:
- ECochG responses to 500 Hz tone bursts were recorded from intracochlear and extracochlear locations during cochlear implant insertion in six patients.
- Analysis focused on amplitude changes, phase shifts, and harmonic distortions in the difference curves between electrode locations.
Main Results:
- Early insertion: Amplitude decrease with phase shift and distortion in intracochlear signals, but not extracochlear signals (n=1).
- Late insertion: Amplitude decreases in intracochlear signals correlated with extracochlear signal decreases (n=2).
Conclusions:
- Simultaneous recording from intracochlear and extracochlear sites aids in interpreting ECochG signal changes during cochlear implantation.
- Phase shifts, harmonic distortions, and electrode location are crucial factors for understanding intracochlear ECochG responses and preventing cochlear trauma.
