Episodic ataxia type 1, an autosomaldominant neurological disorder, is caused by a mutation of the KCNA1 geneencoding the voltage-gated K+ channel KV1.1, whichsubstitutes valine for leucine at position 408 [9].Genetic studies have also identified mutations in KCNQ2 andKCNQ3 encoding the voltage-gated K+ channels KV7.2 andKv7.3, which lead to benign familial neonatal seizures[10]. This evidence concerns the gene KCND3 and hereditary continuous muscle fiber activity.