Their signs and symptoms overlap, although type 2 tends to be milder than type 1. There are two major types of myotonic dystrophy: type 1 and type 2. The severity of the condition varies widely among affected people, even among members of the same family. The features of myotonic dystrophy often develop during a person's twenties or thirties, although they can occur at any age. Some affected individuals develop a condition called diabetes mellitus, in which blood sugar levels can become dangerously high. Other signs and symptoms of myotonic dystrophy include clouding of the lens of the eye ( cataracts ) and abnormalities of the electrical signals that control the heartbeat (cardiac conduction defects). Also, affected people may have slurred speech or temporary locking of their jaw. For example, a person may have difficulty releasing their grip on a doorknob or handle. People with this disorder often have prolonged muscle contractions (myotonia) and are not able to relax certain muscles after use. Myotonic dystrophy is characterized by progressive muscle wasting and weakness. It is the most common form of muscular dystrophy that begins in adulthood. Myotonic dystrophy is part of a group of inherited disorders called muscular dystrophies.
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