Autosomal dominant monosymptomatic myotonia permanens.

Colding-Jørgensen, Eskild; Duno, Morten; Vissing, John · Neurology · 2006

case_series · Level IV

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Abstract

Myotonia permanens is associated with a G1306E mutation in the SCN4A gene. Two sporadic patients have been reported, but the clinical phenotype has not been fully characterized. The authors report a family in which the disease is autosomal dominantly inherited. The patients have severe myotonia, but the clinical picture is not qualitatively different from that seen in other nondystrophic myotonias.

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