Study of Ranolazine in Myotonia Congenita, Paramyotonia Congenita and Myotonic Dystrophy Type 1

Paramyotonia congenita

Using MRI in Patients With Non-dystrophic Myotonia to Access Muscle Contractility Mexiletine and Non Dystrophic Myotonias Characteristics of Nondystrophic Myotonias Study of Ranolazine in Myotonia Congenita, Paramyotonia Congenita and Myotonic Dystrophy Type 1 Phase III Randomized, Double-Blind, Placebo-Controlled Study of Dichlorphenamide for Periodic Paralyses and Associated Sodium Channel Disorders