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Updated: Jan 24, 2026
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Electrically Evoked Stapedius Reflex Measurements in Cochlear Implantation and Its Application in the Postoperative Fitting Process
Published on: June 21, 2024
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Electrical Vestibular Co-stimulation by Lateral Wall Cochlear Implant Electrode Arrays
Laura Fröhlich1, Julia K Mollet1, Ahmed Salha1
1Department of Otorhinolaryngology, University Hospital Bonn, University of Bonn, Bonn, Germany.
Summary
Electrical stimulation via cochlear implant (CI) electrodes can activate the vestibular system, causing vestibular co-stimulation. This occurs more frequently with basal electrodes and may happen before sounds are audible, impacting daily CI use.
Area of Science:
- Neuroscience
- Audiology
- Otolaryngology
Background:
- Cochlear implants (CIs) can potentially stimulate the vestibular system.
- Understanding vestibular responses to electrical stimulation is crucial for CI users.
Purpose of the Study:
- To analyze cervical and ocular vestibular-evoked myogenic potentials (e-cVEMPs and e-oVEMPs) using straight lateral wall CI electrodes.
- To evaluate response characteristics (numbers, amplitudes, latencies, thresholds) based on electrode position.
Main Methods:
- Recorded e-cVEMPs and e-oVEMPs in adult CI patients using electric pulse trains.
- Stimulated with electrodes at apical (E3), medial (E6), and basal (E10, E11) positions.
- Recorded VEMPs via bone-conducted vibration (BCV) as a reference.
Main Results:
- e-VEMPs were measured in 95% of participants; BCV-VEMPs in 60%.
- Basal electrode stimulation showed higher response rates and comparable amplitudes to BCV-VEMPs.
- e-VEMP thresholds were within clinical fitting levels for basal electrodes.
Conclusions:
- Straight lateral wall CI electrodes demonstrate vestibular co-stimulation in most patients (95%).
- Basal electrodes are more likely to induce vestibular co-stimulation than apical or medial ones.
- Vestibular co-stimulation can occur before electric stimuli are audible, potentially during daily CI use.
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