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Related Experiment Videos

Local anesthetic myotoxicity.

Wolfgang Zink1, Bernhard M Graf

  • 1Department of Anesthesiology, University of Heidelberg, Heidelberg, Germany.

Regional Anesthesia and Pain Medicine
|August 12, 2004
PubMed
Summary
This summary is machine-generated.

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Local anesthetics can cause skeletal muscle toxicity, leading to reversible myonecrosis. Muscle damage is dose-dependent, with bupivacaine causing more severe injury than procaine, but regeneration is possible.

Area of Science:

  • Anesthesiology
  • Toxicology
  • Skeletal Muscle Physiology

Background:

  • Local anesthetic drugs can induce skeletal muscle toxicity, a rare side effect.
  • Intramuscular injections of local anesthetics commonly cause reversible myonecrosis.
  • The severity of muscle damage is dose-dependent and exacerbated by continuous administration.

Purpose of the Study:

  • To review the mechanisms and clinical manifestations of local anesthetic-induced skeletal muscle toxicity.
  • To elucidate the dose-dependent and agent-specific myotoxic effects of local anesthetics.
  • To discuss the histological patterns, regenerative capacity, and pathomechanisms of muscle injury.

Main Methods:

  • Review of existing literature on local anesthetic myotoxicity.

Related Experiment Videos

  • Analysis of histological patterns and time course of muscle injury.
  • Discussion of proposed subcellular pathomechanisms, including calcium ion involvement.

    • Main Results:

    • All examined local anesthetics are myotoxic, with varying severity (procaine least, bupivacaine most severe).
    • Histological findings include hypercontracted myofibrils, sarcoplasmic reticulum degeneration, edema, and necrosis, followed by regeneration within weeks.
    • Increased intracellular Ca2+ is implicated in myocyte injury, though other pathways require further investigation.

    Conclusions:

    • Local anesthetic myotoxicity is a reproducible experimental finding, though clinical cases are rare.
    • Clinically relevant myopathy and myonecrosis have been reported after various regional anesthesia techniques.
    • Understanding the pathomechanisms is crucial for managing and preventing local anesthetic-induced muscle damage.