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Types of Muscular Dystrophy

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Muscular dystrophy is the collective term given to a group of muscle wasting diseases that are hereditary (caused by inheriting a defective gene). Occasionally the parents do not pass on the gene and it occurs spontaneously (a new mutation). There are several different forms of muscular dystrophy. They are:

Congenital Muscular Dystrophy

This type occurs at or very near to birth. The baby will have muscle weakness and stiff or loose joints. They may have respiratory difficulty due to weakness in the muscles that control breathing. They might also suffer seizures, suffer vision problems or be mentally retarded.

Myotonic Muscular Dystrophy

This usually occurs in teenagers and adults, although it can occur in babies as a form of congenital muscular dystrophy. It begins with muscle weakness in the face, forearms, lower legs, neck and hands. Sometimes it can cause respiratory and heart problems, eye problems, gastrointestinal symptoms and occasionally, learning disabilities. It is very slow in its progression and can take as many as 60 years for the full range of symptoms to show.

Duchenne Muscular Dystrophy

This is the most common form of muscular dystrophy and affects mainly boys. Girls can carry the gene for Duchenne's, but they don’t usually display any symptoms. The onset of the disease is at around two to five years of age, starting with muscle wasting of the hips, pelvis, thighs and shoulders. It progresses to affect all of the body’s voluntary muscles, including the respiratory muscles and the heart. Most sufferers will die young and it is rare for a sufferer to reach the age of 30. Globally, the disease affects one in every 3,500 boys born.

Becker Muscular Dystrophy

This is a form of Duchenne’s but it is milder and sufferers usually have a normal life expectancy, although they may be in a wheelchair by the time they reach their 30’s. Occasionally death can occur earlier than normal due to heart complications.

Facioscapulohumeral Muscular Dystrophy

This type of muscular dystrophy affects the facial muscles, shoulders and upper arms. The face may become so weak that the person doesn’t have the strength to smile.

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