EA1 was first identified in 1975 by Van Dyke and colleagues when they described a family with a movement disorder accompanied by myokymia, which is characterized by muscle rippling [14]; however, it was not until much later, in 1994, that Browne et al. identified KCNA1 as the genetic cause of EA1 [11]. This evidence concerns the gene KCNA1 and Myokymia.