4.2 GLYCOGEN STORAGE DISEASES Flashcards
What is the enzyme deficiency in GSD I (Von Gierke Disease)?
Glucose-6-phosphatase.
What are the key clinical features of GSD I?
Severe hypoglycemia, lactic acidosis, hepatomegaly, hypertriglyceridemia, hyperuricemia.
What is the treatment for GSD I (Von Gierke Disease)?
Uncooked cornstarch, frequent feedings, liver/kidney transplant.
What is the enzyme deficiency in GSD II (Pompe Disease)?
Lysosomal acid alpha-glucosidase.
What are the key clinical features of GSD II?
Cardiomyopathy in infancy, skeletal myopathy in juvenile/adult forms, muscle weakness.
What is the treatment for GSD II (Pompe Disease)?
Enzyme replacement therapy (alglucosidase alfa), heart transplant for cardiomyopathy.
What is the enzyme deficiency in GSD III (Cori/Forbes Disease)?
Debrancher enzyme (amyloglucosidase).
What are the key clinical features of GSD III?
Hepatomegaly, muscle weakness, hypoglycemia
What is the treatment for GSD III (Cori/Forbes Disease)?
Uncooked cornstarch, high-protein diet.
What is the enzyme deficiency in GSD IV (Andersen Disease)?
Branching enzyme.
What are the key clinical features of GSD IV?
Progressive cirrhosis, hepatomegaly, muscle atrophy (neuromuscular form).
What is the treatment for GSD IV (Andersen Disease)?
Liver transplantation.
What is the enzyme deficiency in GSD V (McArdle Disease)?
Muscle phosphorylase
What are the key clinical features of GSD V?
Exercise intolerance, muscle cramps, rhabdomyolysis.
What is the treatment for GSD V (McArdle Disease)?
Carbohydrate administration before exercise.
What is the enzyme deficiency in GSD VI (Hers Disease)?
Liver phosphorylase