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Related Experiment Videos

Electroglottographic evaluation of the swallow.

R Sorin, M D McClean, F Ezerzer

    Archives of Physical Medicine and Rehabilitation
    |April 1, 1987
    PubMed
    Summary

    The electroglottograph (EGG) can measure swallowing by recording neck tissue impedance. This technique shows potential for evaluating swallowing difficulties in patients with conditions like Parkinson's disease and dysphagia.

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    Area of Science:

    • Biomedical Engineering
    • Speech-Language Pathology
    • Clinical Measurement

    Background:

    • The electroglottograph (EGG) is a non-invasive device that measures vocal fold vibration by detecting changes in electrical impedance across the larynx.
    • Swallowing (deglutition) is a complex physiological process involving intricate coordination of laryngeal and pharyngeal movements.
    • Current methods for swallowing assessment, such as videofluoroscopy, provide valuable information but may have limitations in terms of radiation exposure or quantitative data.

    Observation:

    • Low-frequency impedance changes were recorded using EGG during deglutition in six nonimpaired, two parkinsonian, and two dysphagic subjects.
    • EGG waveforms in nonimpaired subjects were consistently monophasic and correlated with laryngeal height changes.
    • Aberrant EGG waveform patterns were observed in both dysphagic and parkinsonian patients, differing significantly from nonimpaired controls.

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    Findings:

    • The EGG successfully recorded impedance variations during the swallow act.
    • Distinctive EGG waveform patterns were identified in individuals with dysphagia and Parkinson's disease.
    • The observed waveform characteristics in dysphagic patients aligned with videofluoroscopic findings.

    Implications:

    • The electroglottograph demonstrates significant potential as a quantitative tool for swallowing evaluation.
    • EGG measurements could aid in the diagnosis, therapy planning, and research of swallowing disorders.
    • This technique offers a promising non-invasive method for assessing deglutition function and identifying pathological changes.