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Automatic analysis of the electromyogram in patients with chronic partial denervation

M Hayward, R G Willison

    Journal of the Neurological Sciences
    |September 1, 1977
    PubMed
    Summary

    Automatic electromyogram analysis reliably detects chronic partial denervation by identifying elevated mean amplitude. This finding correlates with weakness severity in motor neurone disease and long-standing motor neuropathies, suggesting reinnervation increases motor unit muscle fiber density.

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    Area of Science:

    • Neurology
    • Biomedical Engineering

    Background:

    • Chronic partial denervation affects patients with diverse neurological conditions.
    • Accurate assessment of denervation is crucial for diagnosis and management.

    Purpose of the Study:

    • To evaluate the utility of automatic electromyogram (EMG) analysis in identifying chronic partial denervation.
    • To establish reliable quantitative indices for assessing denervation severity.

    Main Methods:

    • Applied automatic EMG analysis to patients with chronic partial denervation.
    • Measured mean amplitude and mean turns count.
    • Correlated EMG findings with clinical assessments of weakness.

    Main Results:

    • Elevated mean amplitude (>2 SD above control) without significant change in mean turns count consistently indicated chronic partial denervation.

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  • The degree of mean amplitude elevation correlated with motor weakness severity in motor neurone disease.
  • Comparable mean amplitude elevation was observed in long-duration motor neuropathies.

    • Conclusions:

    • Automatic EMG analysis provides a reliable index for chronic partial denervation.
    • Increased motor unit muscle fiber density due to reinnervation is the likely cause of elevated mean amplitude.