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Related Experiment Videos

Effect of methylprednisolone on complement activation during heparin neutralization

P G Loubser1

  • 1Department of Anesthesiology, Baylor College of Medicine, Houston, Texas, USA.

Journal of Cardiovascular Pharmacology
|January 1, 1997
PubMed
Summary

High-dose methylprednisolone pretreatment significantly reduces complement activation during heparin-protamine neutralization after cardiopulmonary bypass. This steroid effect persists, impacting second-phase complement activation in cardiac surgery patients.

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Area of Science:

  • Cardiovascular Surgery
  • Immunology
  • Pharmacology

Background:

  • Steroids are commonly used before cardiopulmonary bypass (CPB) to mitigate "first phase" complement activation.
  • The impact of steroid pretreatment on "second phase" complement activation during protamine administration remains unclear.
  • Heparin-protamine interaction is known to trigger complement activation post-CPB.

Purpose of the Study:

  • To investigate the effect of high-dose methylprednisolone pretreatment on complement activation during heparin-protamine interaction.
  • To determine if steroid pretreatment influences "second phase" complement activation after CPB termination.

Main Methods:

  • A randomized, placebo-controlled study involving 16 patients undergoing coronary artery bypass graft surgery.

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  • Eight patients received methylprednisolone (30 mg/kg) pre-CPB (group MP), while eight received placebo (group C).
  • Complement components (C3a, C4a, C5a) were measured using radioimmunoassay before and after protamine administration.

    • Main Results:

    • Both groups showed increased C3a and C4a levels post-protamine, indicating complement activation.
    • Methylprednisolone-treated patients exhibited significantly lower C3a and C4a levels compared to placebo.
    • No significant C5a levels were detected in either group.

    Conclusions:

    • Methylprednisolone pretreatment effectively inhibits "second phase" complement activation during heparin-protamine interaction.
    • The anti-complementary effect of steroid pretreatment extends beyond the CPB period.
    • Findings suggest potential benefits for patients at risk of severe anaphylactoid reactions to protamine.