Glycogen storage disease type V

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Glycogen storage disease type V

Biochemistry

Biochemistry and metabolism

Glycolysis

Citric acid cycle

Electron transport chain and oxidative phosphorylation

Gluconeogenesis

Glycogen metabolism

Pentose phosphate pathway

Physiological changes during exercise

Amino acid metabolism

Nitrogen and urea cycle

Fatty acid synthesis

Fatty acid oxidation

Ketone body metabolism

Cholesterol metabolism

Metabolic disorders

Essential fructosuria

Hereditary fructose intolerance

Galactosemia

Pyruvate dehydrogenase deficiency

Glucose-6-phosphate dehydrogenase (G6PD) deficiency

Lactose intolerance

Glycogen storage disease type I

Glycogen storage disease type II (NORD)

Glycogen storage disease type III

Glycogen storage disease type IV

Glycogen storage disease type V

Leukodystrophy

Metachromatic leukodystrophy (NORD)

Krabbe disease

Gaucher disease (NORD)

Niemann-Pick disease types A and B (NORD)

Niemann-Pick disease type C

Fabry disease (NORD)

Tay-Sachs disease (NORD)

Mucopolysaccharide storage disease type 1 (Hurler syndrome) (NORD)

Mucopolysaccharide storage disease type 2 (Hunter syndrome) (NORD)

Cystinosis

Hartnup disease

Alkaptonuria

Ornithine transcarbamylase deficiency

Phenylketonuria (NORD)

Cystinuria (NORD)

Homocystinuria

Maple syrup urine disease

Abetalipoproteinemia

Familial hypercholesterolemia

Hypertriglyceridemia

Hyperlipidemia

Disorders of carbohydrate metabolism: Pathology review

Disorders of fatty acid metabolism: Pathology review

Dyslipidemias: Pathology review

Glycogen storage disorders: Pathology review

Lysosomal storage disorders: Pathology review

Disorders of amino acid metabolism: Pathology review

Assessments

Glycogen storage disease type V

Flashcards

0 / 11 complete

USMLE® Step 1 questions

0 / 3 complete

High Yield Notes

7 pages

Flashcards

Glycogen storage disease type V

of complete

Questions

USMLE® Step 1 style questions USMLE

of complete

A 20-year-old man comes to the emergency department with painful muscle spasms. He notices that these episodes worsen after a run and seem to improve after brief periods of rest. His past medical history includes a right knee ACL tear. His temperature is 37.0°C (98.6°F), pulse is 80/min, respirations are 16/min, and blood pressure is 125/75 mmHg. Abdominal examination is unremarkable. Rapid fingerstick glucose is 80 mg/dL. Serum creatine kinase levels are elevated. Laboratory investigations are shown below:

 Serum 
 Sodium   140 mEq/L 
 Potassium  4 mEq/L 
 Creatinine   1.3 mg/dL 
 Creatine kinase  645 U/L 
 Urine  
 BUN/Cr  <15 
 Blood   Positive  
 Erythrocytes  0/hpf 
 Leukocytes  2/hpf 
 Fractional excretion of sodium (FENa  >2%  

Electrocardiogram and echocardiogram are unremarkable. Which of the following is the most likely diagnosis? 

External References

First Aid

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Arrhythmias

McArdle disease p. 85

McArdle disease p. 85

Myoglobinuria

McArdle disease p. 85

External Links

Summary

Glycogen storage disease type V, also known as McArdle's disease, is a glycogen metabolism disorder in which an enzyme known as muscle phosphorylase (myophosphorylase) is deficient. Muscle phosphorylase is necessary to break down glycogen stored in muscles into usable glucose. People with Glycogen storage disease type V can present with rhabdomyolysis, myoglobinuria, exercise intolerance, and muscle weakness.

Elsevier

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