What is Myotonia Congenita?

By  ,  National Institute of Health
Oct 10, 2012
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Myotonia congenita is an inherited neuromuscular disorder characterized by the inability of muscles to quickly relax after a voluntary contraction.  The condition is present since early childhood, but symptoms can be mild.  Most children will be 2 or 3 years old when parents first notice their muscle stiffness, particularly in the legs, often provoked by sudden activity after rest.  The disease doesn’t cause muscle wasting; in fact, it may cause muscle enlargement.  Muscle strength is increased. 

 

There are two forms of the disorder:  Becker-type, which is the most common form; and Thomsen’s disease, which is a rare and milder form.  The disorder is cause by mutations in a gene responsible for shutting off electrical excitation in the muscles.

 

 

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