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Updated: Jan 10, 2026
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Performing Intracochlear Electrocochleography During Cochlear Implantation
Published on: March 8, 2022
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Intraoperative Intracochlear Electrocochleography and Hearing Preservation Early after Cochlear Implantation: A
Orit Samuel1,2, Fatima Moumen Denanto3,4,5, Adrian Dalbert6
1Department of Surgery and the Royal Victorian Eye and Ear Hospital, The University of Melbourne, Melbourne, Victoria, Australia, orit_bd@hotmail.com.
Audiology & Neuro-Otology
|November 29, 2025
Summary
A significant drop in electrocochleography (ECochG) amplitude during cochlear implantation predicts residual hearing. Real-time monitoring of ECochG amplitude changes is crucial for optimizing clinical outcomes in patients receiving cochlear implants.
Area of Science:
- Otolaryngology
- Neuroscience
- Biomedical Engineering
Background:
- Intraoperative electrocochleography (ECochG) monitoring during cochlear implantation (CI) shows inconsistent results across different systems.
- Predicting residual hearing in real-time is essential for optimizing CI outcomes.
Purpose of the Study:
- To synthesize evidence via meta-analysis on real-time intracochlear ECochG predicting residual hearing after CI.
- To evaluate the effectiveness of ECochG amplitude changes in predicting hearing preservation.
Main Methods:
- Meta-analysis of 13 studies with 313 patient data sets meeting inclusion criteria.
- Analysis of real-time ECochG data recorded during CI with lateral wall electrodes.
- Linear mixed modeling and forest plots to assess the relationship between ECochG amplitude drops and hearing outcomes.
Main Results:
- A >30% drop in ECochG amplitude, even if transient, predicted residual hearing across all metrics.
- A >60% amplitude drop predicted relative hearing loss but not decibel hearing loss.
- The 'pattern' of ECochG drop did not reliably predict residual hearing.
Conclusions:
- An instantaneous drop in ECochG amplitude is the most reliable real-time predictor of residual hearing.
- While large insertion-related drops also predict hearing loss, they are assessed post-procedure.
- Real-time ECochG monitoring guidance can optimize clinical outcomes in CI patients.
