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Related Experiment Videos

Complement activation during cardiopulmonary bypass in children.

S Meri1, M Aronen, M Leijala

  • 1Department of Bacteriology and Immunology, University of Helsinki, Finland.

Complement (Basel, Switzerland)
|January 1, 1988
PubMed
Summary
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Cardiopulmonary bypass surgery activates the complement system (C), indicated by decreased C levels and increased C3 activation products. Longer perfusion times correlated with higher C3a desArg levels, suggesting a link to complications.

Area of Science:

  • Immunology
  • Pediatric Surgery
  • Cardiovascular Surgery

Background:

  • Cardiopulmonary bypass (CPB) is a critical procedure in pediatric cardiac surgery.
  • The complement system (C) plays a vital role in innate immunity and can be activated during CPB.
  • Understanding C activation during CPB is crucial for managing postoperative complications.

Purpose of the Study:

  • To prospectively evaluate complement activation in children undergoing CPB.
  • To investigate the correlation between C activation markers and postoperative complications.

Main Methods:

  • Serial serum and plasma samples were collected from 30 children undergoing CPB.
  • Hemolytic C levels and C3 activation products (C3a desArg, C3bi/c) were measured.
  • Complications such as death, respiratory failure (RF), septicaemia, postpericardiotomy syndrome (PPS), and pancreatitis were recorded.

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Main Results:

  • All patients exhibited decreased total hemolytic C levels and increased C3 activation products post-CPB.
  • In 11 patients, CPB was associated with complications, including death, RF, septicaemia, PPS, and pancreatitis.
  • Increased C3a desArg levels showed a linear correlation with CPB perfusion time.
  • Younger patients with RF experienced more extensive C system changes, but no direct correlation between high C3a desArg and RF was found.
  • Postoperative complications were linked to episodes of lower-grade C activation.

Conclusions:

  • CPB surgery consistently activates the complement system in children.
  • Perfusion time is a significant factor influencing C activation during CPB.
  • While not directly correlated with RF, C activation markers may indicate an increased risk or presence of postoperative complications.