Overall, the symptoms and progression of DM 2 are not as severe as those of DM 1, and it is not associated with cognitive problems. Myotonic muscular dystrophy, which is sometimes called myotonic dystrophy, is a type of muscular dystrophy. Verywell Health uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Symptoms of myotonic dystrophy might include difficulty releasing one’s grip (myotonia), weakness of muscles in the hands and feet, difficulty swallowing and abnormal heart rhythms. It is the most common form of muscular dystrophy in adults and affects about one in 8,000 people. Electromyography. Source - National Institutes of Health (NIH) Ophanet, a consortium of European partners, currently defines a condition rare when it affects 1 person per 2,000. Regularly scheduled assessment of heart function is part of the management of myotonic muscular dystrophy. It is the most common form of muscular dystrophy that begins in adulthood, usually in a person’s 20s or 30s. There are two types of myotonic dystrophy: myotonic … There are several forms of MD that may affect different sets of muscles and cause more or less weakness. Myotonic dystrophy is also called Steinert’s disease or dystrophia myotonica. The word myotonic (myotonia) means the inability to relax muscles. The following sections discuss different problems that can occur, although many people with the disease have only some of them. 18 It is an autosomal dominant disorder characterized by facial and distal limb weakness, muscle atrophy, and clinical and electromyographic evidence of myotonia (delayed muscle relaxation after contraction). Also, symptoms such as colicky abdominal … Like DM 1, DM 2 is also autosomal dominant. It affects the muscles in the eyes (ocular) and the throat (pharyngeal). There also is some weakness of arm and neck muscles. Plano. The genetic defects of DM 1 and DM 2 are both described as expansion mutations, which are mutations (alterations) in a genetic code characterized by abnormally elongated strands of DNA, which result in defective protein formation. If your muscle weakness is associated with choking on food, it is best to have a speech and swallow evaluation and to adopt strategies for safe eating, such as chewing and swallowing your food carefully or eating soft foods. (Please note: congenital myotonic dystrophy is not the same as congenital myopathy or congenital muscular dystrophy. DM 1 usually begins during infancy, but may begin at any time during a person’s life. DM2 is generally a milder condition than DM1.The clinical onset of DM2 is typically in the third or fourth decade, with the most commonly presented symptoms being muscle weakness, stiffness and pain. People who have myotonic dystrophy have muscle wasting and weakness in their lower legs, hands, neck and face that get worse over time. Muscular dystrophy is a disease caused by muscle weakness as a result of mutations in genes that regulate muscle function. Muscles often contract and are unable to relax. It is characterized by wasting of the muscles (muscular dystrophy), cataracts, heart conduction defects, endocrine changes, and myotonia. The treatment is focused on relief of symptoms and prevention of complications. The Myotonic Dystrophy Foundation recently published clinical guidelines for people living with myotonic dystrophy, which may help people like Carly and Paul with their medical needs. Heart involvement, digestive problems, and pregnancy issues are not common. What Are the Causes of Muscular Dystrophy? It also causes your muscles to have difficulty relaxing. Sign up for our Health Tip of the Day newsletter, and receive daily tips that will help you live your healthiest life. Myotonic dystrophy is a progressive or degenerative disease. 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