DM and FSHD are two of the nine types of muscular dystrophy. They can be detected through testing at birth, and may be passed from one generation to the next. Both cause progressive, disabling weakness. In addition, DM sometimes results in sudden death. It is marked by a generally slow progression of weakness and muscle wasting affecting the face, feet, hands, neck and glandular system.
Muscles are unable to relax properly after contraction.
DM affects both males and females. The cause is unknown. FSHD is marked by weakness in the facial muscles and weakness and wasting in the shoulders and upper arms. It may progress either slowly or rapidly. FSHD affects both males and females, and a child from an affected parent has a 50 percent risk of inheriting the disease.