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Cochlear prostheses: stimulation-induced damage.

J M Miller, L G Duckert, M A Malone

    The Annals of Otology, Rhinology, and Laryngology
    |November 1, 1983
    PubMed
    Summary
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    Electrical stimulation of the inner ear can cause cochlear damage, particularly at higher currents. Auditory brainstem response changes were reversible and depended on stimulation site and current level.

    Area of Science:

    • Otoacoustic Emissions
    • Neuroscience
    • Biomedical Engineering

    Background:

    • Electrical stimulation of the inner ear is used in cochlear implants.
    • Understanding the effects of electrical stimulation on cochlear tissue and function is crucial for device safety and efficacy.

    Purpose of the Study:

    • To investigate the histopathological and functional effects of chronic electrical stimulation on the guinea pig cochlea.
    • To determine the relationship between stimulation parameters (current level, site) and observed changes.

    Main Methods:

    • Chronic implantation of electrodes in guinea pigs.
    • Weekly 3-hour exposures to continuous sinusoidal electrical stimulation (1 kHz) at various current levels.
    • Histopathological assessment of cochlear tissues.

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  • Measurement of electrically evoked auditory brainstem response (EABR) to assess functional changes.

    • Main Results:

    • Histopathological damage, including new bone growth, occurred with scala tympani stimulation at and above 100 microA rms.
    • Less damage was observed with round window and promontory stimulation compared to scala tympani.
    • Reversible changes in EABR thresholds and suprathreshold features were observed.
    • EABR changes were directly related to stimulus current level and cochlear stimulation site.
    • Suprathreshold EABR features were more sensitive indicators of stimulation effects than threshold measures.

    Conclusions:

    • Continuous electrical stimulation can induce reversible functional changes in the auditory system.
    • Histopathological damage is dependent on stimulation site and current intensity.
    • EABR monitoring provides a sensitive measure of the effects of electrical stimulation, even in the absence of observable tissue damage.