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Hereditary persistent distal cramps.

A Jusic, S Dogan, V Stojanovic

    Journal of Neurology, Neurosurgery, and Psychiatry
    |June 1, 1972
    PubMed
    Summary
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    This study describes a rare inherited muscle cramp disease affecting multiple family generations. Potassium chloride initially relieved symptoms, but the condition recurred, suggesting a unique neurological disorder.

    Area of Science:

    • Neurology
    • Genetics
    • Clinical Medicine

    Background:

    • A familial disease characterized by persistent muscle cramps in distal muscle groups is presented.
    • The condition affects multiple generations within a single family, with varying onset and severity.

    Purpose of the Study:

    • To describe a novel inherited neuromuscular disorder.
    • To investigate the clinical, electrophysiological, and therapeutic characteristics of this unique disease.

    Main Methods:

    • Clinical observation and family history documentation.
    • Electromyography (EMG) including insertion activity, motor unit potentials, and repetitive nerve stimulation.
    • Pharmacological trials with carbamazepine, meprobamate, and potassium chloride.
    • Assessment of response to spinal anesthesia, nerve block, and hydrochlorothiazide.

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    Main Results:

    • Muscle cramps occurred during exertion, relaxation, or sleep, worsening in later generations.
    • EMG revealed continuous electrical discharges mirroring muscle contractions, without myotonic response or changes with nerve stimulation.
    • Spinal anesthesia and nerve block reduced pain but not contractions; local anesthetic infiltration stopped movements.
    • Potassium chloride provided temporary relief, while carbamazepine and meprobamate were ineffective; cramps worsened with hydrochlorothiazide.

    Conclusions:

    • The described disease represents a distinct nosological entity not fitting known classifications.
    • Dominant inheritance is suggested, with potential genetic factors influencing cramp intensity and onset.
    • Further research is needed to elucidate the pathophysiology and identify definitive treatments for this rare neuromuscular condition.