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Limb myokymia

J W Albers, A A Allen, J A Bastron

    Muscle & Nerve
    |November 1, 1981
    PubMed
    Summary
    This summary is machine-generated.

    Myokymic discharges in limb muscles often stem from chronic peripheral nerve damage, particularly after radiation therapy. These findings suggest a focal origin in the peripheral nerves for most limb myokymia.

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    Area of Science:

    • Neurology
    • Clinical Electrophysiology

    Background:

    • Myokymic discharges are abnormal muscle contractions detected via electromyography.
    • These discharges can be associated with various neurological conditions, including radiation-induced injuries and other chronic nerve disorders.

    Purpose of the Study:

    • To investigate the underlying causes and localization of myokymic discharges in limb muscles.
    • To differentiate between radiation-induced and other causes of myokymic discharges.

    Main Methods:

    • Electromyography (EMG) was used to identify myokymic discharges in 38 patients.
    • Clinical evaluation included assessment of neurologic lesions, previous radiation therapy, and diagnostic tests like local ischemia, peripheral nerve block, and percutaneous stimulation.

    Main Results:

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    • Twenty-seven patients had radiation-induced plexopathy, myelopathy, or both.
    • Eleven patients presented with diagnoses including multiple sclerosis, inflammatory polyradiculoneuropathy, ischemic neuropathy, inflammatory myopathy, and chronic spinal cord/peripheral nerve disorders.
    • Clinical findings suggested a focal origin at the site of chronic peripheral nerve lesions for most limb myokymic discharges.

    Conclusions:

    • Myokymic discharges in limb muscles are frequently linked to chronic peripheral nerve lesions.
    • Radiation-induced nerve damage is a significant cause of limb myokymia.
    • The study supports the hypothesis that focal peripheral nerve pathology is the primary source of most limb myokymic discharges.