Related Experiment Videos
Relationship of fibrinolysis and platelet function to bleeding after cardiopulmonary bypass
M J Ray1, N A Marsh, G A Hawson
1Department of Haematology, Prince Charles Hospital, Brisbane, Queensland, Australia.
Insights
Cardiopulmonary bypass (CPB) significantly impacts fibrinolysis and platelet function, leading to increased post-operative blood loss. Higher fibrinolytic activation during CPB correlates with greater blood loss, highlighting a critical relationship.
Area of Science:
- Cardiovascular Surgery
- Hemostasis and Thrombosis
- Coagulation and Fibrinolysis
Background:
- Cardiopulmonary bypass (CPB) is crucial for cardiac surgeries but can affect blood coagulation and fibrinolysis.
- Understanding these effects is vital for managing post-operative bleeding.
Purpose of the Study:
- To investigate the impact of CPB on fibrinolysis and platelet function.
- To determine the relationship between these changes and post-operative blood loss.
Main Methods:
- Analysis of 127 patients undergoing CPB.
- Measurement of fibrinogen, plasminogen, alpha 2-antiplasmin, fibrinolytic potential, platelet aggregation, soluble fibrin, fibrinogen degradation products, D-dimer, PAI-1, and t-PA activity.
- Correlation of pre- and post-CPB levels with post-operative blood loss.
Main Results:
- CPB significantly reduced fibrinogen, plasminogen, alpha 2-antiplasmin, fibrinolytic potential, and platelet aggregation.
- Soluble fibrin, fibrinogen degradation products, D-dimer, and PAI-1 levels increased during CPB.
- Lower pre-CPB alpha 2-antiplasmin and higher t-PA activity were associated with increased blood loss.
- Hemodilution exacerbated the decrease in coagulation factors and increased blood loss.
Conclusions:
- Increased fibrinolytic activation during CPB is directly linked to greater post-operative blood loss.
- Pre-operative hemostatic status influences post-CPB bleeding risk.
- CPB-induced hemostatic changes, including fibrinolysis activation, are critical factors in post-operative bleeding management.
Abstract:
In order to study the effects of cardiopulmonary bypass (CPB) on fibrinolysis and platelet function and the possible relationship of these effects on post-operative blood loss, 127 patients undergoing CPB were examined. There was a significant reduction in the median levels of fibrinogen, plasminogen, alpha 2-antiplasmin, fibrinolytic potential and platelet aggregation during CPB (P < or = 0.001). Median levels of soluble fibrin, fibrinogen degradation products, D-dimer and PAI-1 were increased, while the level of t-PA activity remained constant. Post-CPB levels of fibrinogen and plasminogen correlated negatively with blood loss (P = 0.003 and P < 0.001, respectively) and interestingly, lower levels of alpha 2-antiplasmin and higher levels of t-PA activity before CPB were associated with greater blood loss after CPB (P < 0.001 and P = 0.004, respectively). Better pre-CPB platelet function correlated with lower levels of D-dimer before and after CPB. As expected, haemodilution had a significant effect on fibrinolytic and coagulation parameters post-CPB; the greater the haemodilution, the more the concentration of fibrinogen, plasminogen and alpha 2-antiplasmin fell post-CPB and the greater the blood loss. The increase in PAI-1 levels intra-CPB appeared to result in mean t-PA activity remaining unchanged 1 h post-CPB. Post-CPB increases in soluble fibrin were paralleled by increases in fibrinogen degradation products and D-dimer, suggesting that intra-operative contact activation is related to activation of the fibrinolytic system. The present findings indicate the greater the fibrinolytic activation, the greater the post-CPB blood loss.