Myotonia
Description
The failure of a muscle to relax after a contraction. It is caused by a number of neuromuscular diseases including a form of muscular dystrophy (myoclonic dystrophy or myoclonic muscular dystrophy), and myotonia congenita. It can also occur in normal individuals after vigorous exercise.
Symptoms
Inbility of a muscle to relax after a contraction. The symptoms tend to improve with repetitive attempts to relax.
Tests
A history and physical will be done. A muscle biopsy or EMG (electromyograph) may be done to determine the cause as well as blood tests.
Treatment
Treatment is dependent on the disease causing the disorder. For more information on myotonic dystrophy see http://www.myotonic.org/, and for more information on myotonia congenita see http://www.nlm.nih.gov/medlineplus/ency/article/001424.htm.
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