The
glycogen storage diseases (GSD) are a heterogenous group of inherited disorders involving one of the several steps of
glycogen synthesis or degradation. Type III GSD, also known as Cori's or Forbe's disease, results from a deficiency of the
enzyme,
amylo-1,6-glucosidase, which is responsible for the breakdown or debranching of the
glycogen molecule during catabolism. As a result of this deficiency, inadequate
glycogen breakdown occurs, resulting in hypoglycaemia during periods of fasting or stress, as well as storage of excessive
glycogen, predominantly in the liver.
Glycogen accumulation in the liver leads to hepatogmegaly and, in some instances, hepatic dysfunction with
cirrhosis in the third and fourth decades of life. Additionally, deficiency of the
enzyme in skeletal and cardiac muscle can lead to skeletal muscle weakness and
cardiomyopathy. We present a 28-month-old girl who presented for anaesthetic care for
cardiopulmonary bypass and closure of an
atrial septal defect. The potential perioperative implications of GSD type III are discussed.