• Acta Neurol. Scand. · Oct 1992

    Randomized Controlled Trial Comparative Study Clinical Trial

    Treatment of myotonia with antiarrhythmic drugs.

    • H Kwieciński, B Ryniewicz, and A Ostrzycki.
    • Department of Neurology, Warsaw Medical Academy, Poland.
    • Acta Neurol. Scand. 1992 Oct 1;86(4):371-5.

    AbstractThe effects of disopyramide, phenytoin, mexiletine, and tocainide were compared in 30 patients with myotonic disorders. The severity of myotonia was assessed by clinical and electromyographic criteria at the end of each treatment phase lasting four weeks. Mexiletine (MXT) and tocainide (TCD) were found to be the most potent antimyotonic agents. The antimyotonic efficacy of MXT and TCD is explained by their fast-blocking effect on voltage-dependent sodium channels in the muscle membrane. The benefits of myotonia control with pharmacological agents must be weight against the risk of therapy in the individual patient. Because of the risks of hematologic problems, TCD is not recommended by us for the treatment of myotonia.

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