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Complement activation during cardiac and thoracic vascular operations.

P G Loubser1

  • 1Division of Cardiovascular Anesthesia, Texas Heart Institute, St. Luke's Episcopal Hospital, Houston, Texas, USA.

Texas Heart Institute Journal
|December 1, 1987
PubMed
Summary
This summary is machine-generated.

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Cardiopulmonary bypass (CPB) significantly elevates complement activation, particularly via the alternative pathway, with protamine further activating the classical pathway. Non-CPB patients show activation only from protamine via the classical pathway.

Area of Science:

  • Immunology
  • Cardiovascular Surgery

Background:

  • Complement activation is a critical immune response.
  • Understanding complement activation during surgery is vital for patient outcomes.

Purpose of the Study:

  • To investigate and compare complement activation levels in patients undergoing cardiac operations with and without cardiopulmonary bypass (CPB).
  • To elucidate the pathways of complement activation induced by CPB and protamine administration.

Main Methods:

  • Radioimmunoassay was used to measure C3a concentrations, a marker of complement activation.
  • Patient groups included nine undergoing cardiac operations with CPB and nine undergoing thoracic vascular operations without CPB.

Main Results:

  • CPB patients exhibited a tenfold increase in C3a post-bypass, with protamine causing a further twofold increase.

Related Experiment Videos

  • Non-CPB patients showed a tenfold C3a increase solely after protamine administration.
  • Peak post-protamine C3a levels were significantly higher in the CPB group (p < 0.01).

    • Conclusions:

    • CPB triggers complement activation via the alternative pathway, with protamine subsequently activating the classical pathway.
    • In non-CPB patients, complement activation occurs exclusively via the classical pathway in response to protamine.
    • Surgical procedures involving CPB lead to a more pronounced complement activation response compared to non-CPB thoracic vascular operations.