Metabolic myopathy

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Obesity, Sleep & Internal medicine
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Metabolic myopathy
Synonyms
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Specialty	Neurology, Endocrinology
Symptoms	Muscle weakness, exercise intolerance, muscle cramps
Complications	N/A
Onset	Varies, often childhood or early adulthood
Duration	Chronic
Types	Glycogen storage disease, Mitochondrial myopathy, Lipid storage myopathy
Causes	Genetic mutations affecting muscle metabolism
Risks	Family history of metabolic disorders
Diagnosis	Muscle biopsy, Genetic testing, Blood test
Differential diagnosis	Muscular dystrophy, Inflammatory myopathy
Prevention	N/A
Treatment	Dietary management, exercise modification, medications
Medication
Prognosis	Varies depending on type and severity
Frequency	Rare
Deaths	N/A

Metabolic Myopathy is a group of metabolic disorders that primarily affect the muscles. These disorders are caused by defects in the processing of nutrients within the body, leading to a range of symptoms including muscle weakness, cramps, and in severe cases, rhabdomyolysis.

Skeletal Muscle Contraction

Causes

Metabolic myopathies are caused by genetic mutations that lead to deficiencies in the enzymes needed for muscle energy production. These enzymes are involved in the breakdown of carbohydrates and fats, the primary sources of energy for muscle cells. The specific enzyme deficiency determines the type of metabolic myopathy, such as McArdle's disease, CPT II deficiency, and mitochondrial myopathies.

Symptoms

The symptoms of metabolic myopathies vary depending on the specific disorder and the severity of the enzyme deficiency. Common symptoms include muscle weakness, fatigue, muscle cramps, and exercise intolerance. In severe cases, patients may experience rhabdomyolysis, a condition characterized by the breakdown of muscle tissue leading to the release of muscle fiber contents into the bloodstream.

Diagnosis

Diagnosis of metabolic myopathies involves a combination of clinical evaluation, laboratory testing, and genetic testing. Muscle biopsies may also be performed to examine the muscle tissue for signs of metabolic disease.

Treatment

Treatment for metabolic myopathies is primarily supportive and focuses on managing symptoms and preventing complications. This may include dietary modifications, physical therapy, and in some cases, medication.

See also

• Glycogen storage disease
• Lipid storage disorder
• Mitochondrial disease

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