Source:http://linkedlifedata.com/resource/umls/id/C0238358
MSH: An autosomal dominant familial disorder characterized by recurrent episodes of skeletal muscle weakness associated with falls in serum potassium levels. The condition usually presents in the first or second decade of life with attacks of trunk and leg paresis during sleep or shortly after awakening. Symptoms may persist for hours to days and generally are precipitated by exercise or a meal high in carbohydrates. (Adams et al., Principles of Neurology, 6th ed, p1483),NCI: An autosomal dominant inherited or genetic disorder characterized by irregular episodes of muscle weakness or paralysis which are always accompanied by low levels of potassium in the blood.