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Postoperative changes in procoagulant factors after major surgery
Susanne Lison1, Georg Weiss, Michael Spannagl
1Department of Hemostasis and Transfusion Medicine, University of Munich, Munich, Germany. susanne.lison@med.uni-muenchen.de
Summary
Post-surgery, patients develop hypercoagulability (increased clotting) by day 2, increasing thrombotic risk. Standard coagulation tests fail to detect this critical change in procoagulant factors.
Area of Science:
- Clinical Medicine
- Hematology
- Surgical Research
Background:
- Surgical patients face bleeding risks but also develop postoperative hypercoagulability, increasing thrombotic event likelihood.
- The temporal dynamics of post-surgical coagulation remain incompletely understood.
- Characterizing these changes is crucial for managing surgical patient hemostasis.
Purpose of the Study:
- To comprehensively describe changes in procoagulant factors following major surgery.
- To assess the efficacy of standard coagulation tests in identifying postoperative hypercoagulability.
Main Methods:
- Analysis of 51 major surgery patients, with blood sampling preoperatively and on postoperative days (PODs) 1, 2, 3, and 6.
- Measurement of prothrombin time (PT), activated partial thromboplastin time (aPTT), clotting factors, von Willebrand factor (vWF), fibrinogen, thrombelastometry, and multiplate electrode aggregometry (MEA).
Main Results:
- Procoagulant factors (II, VII, X, XI, XII) decreased on POD 1, persisting until POD 3.
- Fibrinogen, factor VIII, and vWF increased from POD 2 onwards.
- Thrombelastometry and MEA indicated increased clot firmness and platelet aggregation, but absolute values remained within normal limits, with hypercoagulation evident only through serial measurements.
Conclusions:
- Significant hypercoagulability emerges by POD 2 after major surgery.
- Conventional coagulation tests (PT, aPTT) and point-of-care devices do not reliably detect this postoperative hypercoagulable state.
- Serial monitoring of coagulation parameters is essential for identifying hypercoagulability in surgical patients.
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