[WPW syndrome combined with AV block 2 in an adult with glycogenosis (Type II)].

A 31 year-old female with a five year history of muscle weakness, cardiac palpitations and elevation of activity of some serum enzymes of muscular origin, showed signs of the WPW syndrome on ECG, often in combination with grade 2 A-V block. Type II glycogenosis (Pompe's disease) was diagnosed on the basis of the results of physical examination, laboratory findings--especially subtotal deficiency of acid maltase (a-1,4 glucosidase) activity-and morphological aspects of light and electron microscopy of a quadriceps muscle biopsy specimen. To our knowledge the coincidence of such a rarely encountered arrhythmia with glycogenosis type II in an adult has never been reported so far.