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Related Experiment Videos

Complement activation by propofol and its effect during propofol anaesthesia.

H Ohmizo1, H Iwama, T Sugita

  • 1Department of Anaesthesiology, Central Aizu General Hospital, Aizuwakamatsu, Japan.

Anaesthesia and Intensive Care
|January 13, 2000
PubMed
Summary

Propofol's lipid solvent activates complement, generating C3a and C4a. However, propofol anesthesia did not significantly increase plasma C3a levels, indicating minimal accumulation.

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Area of Science:

  • Anesthesiology
  • Immunology
  • Pharmacology

Background:

  • Propofol is a widely used intravenous anesthetic agent.
  • The potential for propofol to activate the complement system has been investigated.
  • Understanding complement activation is crucial for patient safety during anesthesia.

Purpose of the Study:

  • To determine if propofol activates the complement system.
  • To investigate the role of propofol's lipid solvent in complement activation.
  • To assess the in vivo relevance of complement activation during propofol anesthesia.

Main Methods:

  • In vitro studies mixing blood with saline, propofol, or lipid solvent, followed by C3a and C4a assays.
  • In vitro studies assessing C3a levels with varying concentrations of nafamostat mesilate (anti-complement agent).

Related Experiment Videos

  • In vivo study measuring plasma C3a concentration in patients during propofol anesthesia.

    • Main Results:

    • The lipid solvent for propofol activated complement, producing C3a and C4a similar to propofol.
    • Complement activation by the lipid solvent occurred via classical and alternative pathways.
    • Nafamostat mesilate did not inhibit the observed complement activation.
    • No significant change in plasma C3a concentration was observed during propofol anesthesia.

    Conclusions:

    • Propofol's lipid solvent, not propofol itself, is responsible for in vitro complement activation.
    • Complement activation by the lipid solvent is not effectively inhibited by nafamostat mesilate.
    • Clinical accumulation of C3a during propofol anesthesia is minimal, suggesting limited in vivo complement activation.