What are the inherited myotonic disorders?
• Myotonic dystrophy type 1 (DM1)
• Myotonic dystrophy type 2 (DM2) (formerly known as proximal myotonic myopathy or PROMM)
• Myotonia congenita (Thomsen disease, Becker’s disease ∗∗ Autosomal recessive inheritance; all other conditions are autosomal dominant inheritance.)
• Paramyotonia congenita
• Periodic paralysis (hypokalemic, normo/hyperkalemic)
• Chondrodystrophic myotonia ∗ (Schwartz–Jampel syndrome)
