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The sensitivity of different methods for detecting abnormalities in auditory nerve function.

Tianhao Lu^1,2, Qiang Li^1,2, Chen Zhang^1,2

¹Department of Otolaryngology, Eye & ENT Hospital of Fudan University, 83 Fenyang Road, Shanghai, 200031, China.

Biomedical Engineering Online

|February 5, 2020

Summary

This summary is machine-generated.

Electrically evoked compound action potentials (ECAPs) and auditory brainstem responses (EABRs) assess auditory nerve function after cochlear implants. ECAP thresholds were higher than EABR thresholds, with AP-ECAP showing greater sensitivity in abnormal auditory nerve states.

Keywords:

Different functional states of auditory nerve Electrical stimulation Electrically evoked auditory brainstem response Electrically evoked compound action potential

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Area of Science:

Neuroscience
Audiology
Biomedical Engineering

Background:

Cochlear implants (CIs) are crucial for treating severe-to-profound sensorineural hearing loss (SNHL).
Electrically evoked compound action potentials (ECAPs) and electrically evoked auditory brainstem responses (EABRs) are reliable postoperative electrophysiological measures.
Limited research compares ECAP and EABR characteristics across different auditory nerve functional states (FSANs).

Purpose of the Study:

To compare electrophysiological characteristics of the auditory nerve using ECAPs and EABRs.
To evaluate these measures under normal and abnormal FSANs in a guinea pig model.
To investigate the sensitivity of different ECAP measurement techniques.

Main Methods:

Guinea pigs received unilateral cochlear implants with continuous electrical stimulation for 4 hours.
Amplitude growth functions (AGFs) for alternating polarity ECAP (AP-ECAP) and forward-masking subtraction ECAP (FM-ECAP) were recorded.
EABR waves were obtained under both normal and abnormal FSAN conditions.

Main Results:

Both AP-ECAP and FM-ECAP thresholds were significantly higher than EABR thresholds in both normal and abnormal FSANs.
Significant differences in AP-ECAP slope values were observed between electrode groups under abnormal FSAN.
The threshold gap between AP-ECAP and FM-ECAP was significantly larger in abnormal FSAN compared to normal FSAN.

Conclusions:

ECAP thresholds are consistently higher than EABR thresholds.
AP-ECAP demonstrates superior sensitivity compared to FM-ECAP when the auditory nerve is in an abnormal functional state.