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Stochastic Noise Application for the Assessment of Medial Vestibular Nucleus Neuron Sensitivity In Vitro
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Stimulation Crosstalk Between Cochlear And Vestibular Spaces During Cochlear Electrical Stimulation
Ángel Ramos de Miguel1, Isaura Rodriguez Montesdeoca2, Juan Carlos Falcón González2
1Hearing and Balance Laboratory, University of Las Palmas de Gran Canaria, Las Palmas, Spain.
The Laryngoscope
|November 27, 2023
Summary
Direct vestibular stimulation, not cochlear implant stimulation, improved balance in patients with bilateral vestibulopathy. Cochlear implants did not show cross-stimulation to the otolith organs.
Area of Science:
- Otolaryngology
- Neuroscience
- Biomedical Engineering
Background:
- Cochlear implant (CI) stimulation may potentially influence otolith end organs.
- Understanding this interaction is crucial for developing effective vestibular prosthetics.
Purpose of the Study:
- To investigate the effect of electrical cochlear stimulation on the vestibule.
- To compare vestibular stimulation (VI) versus cochlear stimulation (CI) using a cochleo-vestibular implant.
Main Methods:
- A case-control study involving four patients with bilateral vestibulopathy.
- Utilized a double electrode array research implant.
- Assessed outcomes using Dynamic Gait Index (DGI), vestibular head impulse test (vHIT), and cervical myogenic responses (cVEMP), including electrical cVEMP and Trans-impedance Matrix (TIM) analysis.
Main Results:
- Cochlear stimulation alone did not yield clinical vestibular improvement.
- Activating the vestibular electrode significantly improved gait metrics (average 38% DGI improvement).
- Trans-impedance Matrix analysis confirmed insufficient current flow from the cochlea to the vestibule for cross-stimulation.
Conclusions:
- Direct electrical stimulation of otolith end organs is necessary for effective stimulation.
- No effective cross-stimulation was observed from cochlear electrode stimulation in this study.
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