A sixth family with autosomal dominantly inherited myokymia and paroxysmal ataxia is described. The syndrome in this family is linked to the recently discovered locus for inherited myokymia and paroxysmal ataxia on the human chromosome 12p, and a missense mutation is shown in the KCNA1 gene. The
Thirty-eight patients with myokymic discharges localized to limb muscles on needle electromyography had various neurologic lesions, both acute and chronic. Of the 38 patients, 27 had had previous radiation therapy and the clinical diagnosis of radiation-induced plexopathy, myelopathy, or both. For
The authors report the case of a 67-year-old man, affected by diffuse spasms evoked by ischemia and voluntary and reflex movements electromyographically characterized by an intense repetitive activity. There was also a modest and diffuse muscle wasting with lower limbs areflexia; no myokymia. The
A case of Isaacs' syndrome with Trousseau's phenomenon is reported. Myokymia, pseudomyotonia (difficulty relaxing after forceful contraction), and ischemia-induced carpal spasm (Trousseau's phenomenon) were not abolished by nerve block distal to the cuff or by intravenous infusion of calcium.
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