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Brachial plexus myoclonus.

G Banks, V K Nielsen, M P Short

    Journal of Neurology, Neurosurgery, and Psychiatry
    |June 1, 1985
    PubMed
    Summary
    This summary is machine-generated.

    Rhythmic arm myoclonus, persisting for six years after injury, was linked to mechanical irritation of the brachial plexus. Arm abduction above horizontal level alleviated the myoclonus and abnormal EMG activity.

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    Area of Science:

    • Neurology
    • Neurophysiology

    Background:

    • Rhythmic myoclonus is an involuntary muscle jerk.
    • Persistent myoclonus can significantly impact quality of life.

    Observation:

    • A six-year history of continuous rhythmic arm myoclonus following an injury.
    • Electromyography (EMG) revealed abnormal activity localized to muscles innervated by the axillary and radial nerves, originating from the posterior cord of the brachial plexus.

    Findings:

    • Arm abduction above the horizontal plane completely abolished the myoclonus and associated EMG discharges.
    • Electroencephalography (EEG) results were within normal limits.

    Implications:

    • Suggests mechanical irritation of the posterior cord of the brachial plexus as the cause of the myoclonus.

    Related Experiment Videos

  • Highlights the potential for localized nerve irritation to manifest as persistent rhythmic myoclonus.
  • Demonstrates a specific physical maneuver (arm abduction) that can alleviate symptoms, offering potential therapeutic insights.