What exactly is pompe disease?

Glycogen storage. Pompes disease is a glygogen storage disorder type ii , due to lack of an enzyme glycogen ( the way you store glucose in muscle and liver) can not be broken down.Glycogen excess in muscle causes severe muscle weakness(hypotonia) and eventuallybrespiratory failure(due to respiratory muscle involvement).
Glycogen Storage. A genetic disease where there is accumulation of glycogen in muscle, heart, and liver because of a deficiency in the enzyme, acid maltase, which helps to convert glycogen into the usable glucose fuel for the body. There are 3 types. Please refer to this site for more info http://ghr.Nlm.Nih.Gov/condition/pompe-disease.