When functionally debilitating, myotonia in Muscular dystrophy (MD) disease in the U.S. affects 1 in 50 million girls and 1 in 5,600 to 7,000 males from ages 5 to 24. Approximately 1 in 8,000 people have myotonic dystrophy.. However, it's often the smaller muscles that are affected first, such as those in the face, jaw and neck. DM 1 is also called Steinert’s disease. 161 N. Clark, Suite 3550. Myotonic muscular dystrophy is a common multi-system disorder that affects the skeletal muscles (the muscles that move the limbs and trunk) as well as smooth muscles (the muscles that control the digestive system) and cardiac muscles of the heart. The condition is progressive, so symptoms of muscle stiffness and weakness tend to worsen over time. Myotonic dystrophy can appear at any time between birth and old age. Myotonic dystrophy (DM) is one of the muscular dystrophies. Electrodiagnostic and genetic testing help differentiate among the NDMs and between NDM and DM. Muscular Dystrophy Statistics. There are two types of myotonic muscular dystrophy, described as type 1 (DM 1) and type 2 (DM 2). Other symptoms include daytime sleepiness, cataracts and heart problems, notes the Muscular Dystrophy Association. Muscular dystrophy (MD) refers to a group of nine genetic diseases that cause progressive weakness and degeneration of muscles used during voluntary movement. from myotonic dystrophy type 1 and 2 (DM1 and DM2), which have significant, extra-muscular,systemicmanifestations.Onclinicalgroundsalone,thereisoftenanoverlap among DM2andNDM. As with other types of muscular dystrophy, myotonic dystrophy involves progressive muscle weakness and muscle wasting. There are nine different types of MD: Myotonic: Most common MD in both men and women. The frequency and predictors of NAFLD in this population have not been described. It is the most common form seen in adults and is suspected to be among the most common forms overall. Myotonic dystrophy is a disease that affects the muscles and other body systems. General Overview. It is estimated that the condition affects about one in 8,000 people worldwide. Myotonic dystrophy (DM1) is the most common form of adult-onset muscular dystrophy, and there is a high frequency of insulin resistance due to insulin receptor mRNA splicing defects in muscle tissue. Myotonic muscular dystrophy is the most common form of muscular dystrophy that affects adults and is characterized by myotonia, a symptom involving prolonged muscle stiffening or spasms that worsen in cold temperatures, explains WebMD. Chicago, Illinois 60601. 800-572-1717 | ResourceCenter@mdausa.org Myotonic dystrophy is the most common type of late-developing muscular dystrophy.Although it can appear at any age, it usually presents itself in adults in their 20s and 30s. There are congenital forms of MD that are present at the time of birth, whereas other types often develop when a person is in his or her teens or 20s. Myotonic muscular dystrophy, which is sometimes called myotonic dystrophy, is a type of muscular dystrophy. Myotonic dystrophy. This disease is characterized by progressive muscle loss and weakness. In the world, 1 in 3,500 males has MD. Other types of muscular dystrophy, including limb-girdle, myotonic, fascioscapulohumeral (FSHD), and congenital MD, can affect both men and women. Myotonic Dystrophy or dystrophia myotonica (DM) is a genetic disease characterized by progressive muscle degeneration. Muscular Dystrophy Association National Office. Myotonic Dystrophy is a tri-nucleotide repeat, autosomal dominant disease characterized by an inability to relax (myotonia) and muscle wasting (muscular dystrophy). 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