Concept

Glycogen storage disease type V

Summary
Glycogen storage disease type V (GSD5, GSD-V), also known as McArdle's disease, is a metabolic disorder, one of the metabolic myopathies, more specifically a muscle glycogen storage disease, caused by a deficiency of myophosphorylase. Its incidence is reported as one in 100,000, roughly the same as glycogen storage disease type I. The disease was first reported in 1951 by Dr. Brian McArdle of Guy's Hospital, London. Signs and symptoms Onset symptoms The onset of this disease is usually noticed in childhood, but often not diagnosed until the third or fourth decade of life. Symptoms include exercise intolerance with muscle pain, early fatigue, painful cramps, inappropriate rapid heart rate response to exercise, and may include myoglobin in the urine (often provoked by a bout of exercise). "In McArdle's, our heart rate tends to increase in what is called an 'inappropriate' response. That is, after th
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