RT Book, Section A1 Amato, Anthony A. A1 Russell, James A. SR Print(0) ID 1115662058 T1 Myotonic Dystrophies T2 Neuromuscular Disorders, 2e YR 2015 FD 2015 PB McGraw-Hill Education PP New York, NY SN 9780071752503 LK neurology.mhmedical.com/content.aspx?aid=1115662058 RD 2024/03/28 AB Myotonic dystrophy is the most common myotonic disorder (Table 31-1). There are at least two genetically distinct forms of myotonic dystrophy: Dystrophica myotonia type 1 (DM1) and dystrophica myotonia type 2 (DM2), the later of which is also known as proximal myotonic myopathy (PROMM).