Sam:

In addition to the resources Jan pointed you to, there are also many people on the Facebook myotonias group with paramyotonia and other myotonia causing SCN4A mutations. Most SCN4A mutations that I am aware of seem to be dominant...there is usually a parent with it as well, so if she has not already had it, I would ask to have it done.

Type of Myotonia: Becker

Country: USA