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Coagulation Tests and Bleeding Classification After Cardiopulmonary Bypass: A Prospective Study.

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Journal of Cardiothoracic and Vascular Anesthesia
|March 2, 2023
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Standard coagulation tests and thromboelastography (TEG) show poor accuracy in identifying excessive microvascular bleeding after cardiopulmonary bypass (CPB). Prothrombin time-international normalized ratio and platelet count performed best but still had low predictive utility.

Keywords:
bleedingcardiac surgerycardiopulmonary bypasscoagulationtransfusion

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Area of Science:

  • Cardiovascular Surgery
  • Hematology
  • Anesthesiology

Background:

  • Excessive microvascular bleeding is a significant complication following cardiopulmonary bypass (CPB).
  • Accurate identification of patients at risk is crucial for effective perioperative management.
  • Current diagnostic tools require further evaluation for their efficacy in this specific context.

Purpose of the Study:

  • To assess the accuracy of standard coagulation tests and thromboelastography (TEG) in identifying patients with excessive microvascular bleeding after CPB.
  • To evaluate the predictive value of these tests for classifying bleeding severity.

Main Methods:

  • Prospective observational study at a single academic hospital.
  • Inclusion of adult patients undergoing elective cardiac surgery.
  • Qualitative assessment of microvascular bleeding by surgeon and anesthesiologist consensus, correlated with coagulation profile tests and TEG values.

Main Results:

  • 816 patients were analyzed; 358 (44%) were classified as bleeders.
  • Accuracy, sensitivity, and specificity for tested coagulation parameters ranged from 45% to 72%.
  • Prothrombin time-international normalized ratio (PT-INR) and platelet count demonstrated the highest performance but with low overall accuracy.

Conclusions:

  • Standard coagulation tests and TEG components, when used in isolation, show poor agreement with the clinical classification of microvascular bleeding post-CPB.
  • PT-INR and platelet count were the most accurate but still insufficient for reliable prediction.
  • Further research is needed to develop improved testing strategies for guiding transfusion decisions in cardiac surgery.