1) Myotonia: Disorder causing difficulty relaxing contracted voluntary muscles.

2) As a result of face myotonia, expressional movement and twinkling eye movement decrease, show " mask face " .

3) Myotonia Congenital is a rare heredity disease, and has special clinical features in patients of the family.

4) People with myotonic dystrophy have prolonged muscle tensing (myotonia) and are not able to relax certain muscles after use.

5) Conclusions DM is a hereditary disease. The main clinical features are muscle weakness and myotonia associated with multisystem lesions.

6) Recently study founded this kind of patients often with symptoms, such as the curve of cervical vertebrae change, neck and shoulder aching , myotonia , etc.

7) Conclusions The clinical characteristics of DM are weakness, atrophy and myotonia.

8) Animal experiments demonstrated that uracil and uridine were capabie of lowering the elevated serum aldolase level of mice suffering from experimental myotonia.