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[Enzymes and muscle diseases]

M. Plebani1

  • 1Dipartimento di Medicina di Laboratorio, Azienda Ospedaliera di Padova, Italia. pad08821@pd.nettuno.it

Reumatismo
|August 7, 2002
PubMed
Summary

Elevated muscle enzymes like creatine kinase in the blood can indicate skeletal muscle disorders. Measuring creatine kinase, aspartate aminotransferase, and aldolase helps differentiate muscular dystrophies from other myopathies, guiding biopsy decisions.

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Area of Science:

  • Biochemistry
  • Clinical enzymology
  • Neuromuscular disorders

Background:

  • Skeletal muscle disorders can cause muscle enzymes to enter circulation, increasing serum enzyme activity.
  • Creatine kinase (CK) is the most abundant muscle enzyme and shows the greatest elevation in various muscle diseases.
  • Aspartate aminotransferase (AST) is significantly associated with inflammation in muscle tissue.

Purpose of the Study:

  • To evaluate a diagnostic algorithm for differentiating skeletal muscle disorders.
  • To assess the utility of combined enzyme measurements in clinical diagnosis.
  • To identify patients who would benefit most from skeletal muscle biopsy.

Main Methods:

  • Measurement of serum creatine kinase (CK) levels.
  • Measurement of serum aspartate aminotransferase (AST) levels.
  • Measurement of serum aldolase levels.
  • Development of a diagnostic algorithm using these enzyme levels.

Main Results:

  • A diagnostic algorithm combining CK, AST, and aldolase effectively discriminated between muscular dystrophies and polymyositis/other myopathies.
  • This enzyme-based algorithm demonstrated diagnostic utility in identifying specific muscle disease types.
  • The algorithm aids in selecting patients requiring skeletal muscle biopsy.

Conclusions:

  • Combined measurement of creatine kinase, aspartate aminotransferase, and aldolase offers a valuable diagnostic approach for skeletal muscle disorders.
  • This biochemical strategy can improve the diagnostic pathway for myopathies.
  • The algorithm assists clinicians in optimizing the use of invasive diagnostic procedures like muscle biopsy.

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