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Myotonic dystrophy (dystrophia myotonica, myotonia atrophica) is a chronic, slowly progressing, highly variable, inherited multisystemic disease. It is an autosomal-dominant disease. It is characterized by wasting of the muscles (muscular dystrophy), cataracts, heart conduction defects, endocrine changes, and myotonia. There are two main types of myotonic dystrophy. Myotonic dystrophy type 1 (DM1), also called Steinert disease, has a severe congenital form and an adult-onset form. Myotonic dystrophy type 2 (DM2), also called proximal myotonic myopathy (PROMM) is rarer than DM1 and generally manifests with milder signs and symptoms. Myotonic dystrophy can occur in people of any age. Both forms of the disease display an autosomal-dominant pattern of inheritance. Both "DM1" and "DM2" have adult-onset forms. ==Signs and symptoms== Presentation of symptoms and signs varies considerably by form (DM1/DM2), severity and even unusual DM2 phenotypes. DM1 symptoms for DM2 include problems with executive function (e.g., organization, concentration, word-finding) and hypersomnia. Conduction abnormalities are more common in DM1 than DM2, but all people are advised to have an annual ECG. Both types are also associated with insulin resistance. Myotonic dystrophy may have a cortical cataract with a blue dot appearance, or a posterior subcapsular cataract. DM2 is generally milder than DM1, with generally fewer DM2 people requiring assistive devices than DM1 people. In addition, the severe congenital form that affects babies in DM1 has not been found in DM2 and the early onset of symptoms is rarely noted to appear in younger people in the medical literature. Death from the disease is unlikely but possible in both forms of myotonic dystrophy. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Myotonic dystrophy」の詳細全文を読む スポンサード リンク
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