Blood coagulation & fibrinolysis : an international journal in haemostasis and thrombosis
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Reduced factor XIIIA levels and decreased clot strength have been associated with increased bleeding after cardiopulmonary bypass (CPB). The purpose of this study was to evaluate the relationship between hemostatic factors, including factor XIIIA, and clot strength before, during and after CPB. Factor XIIIA antigen, platelet counts, fibrinogen, factor V activity, tissue plasminogen activator and clot strength (by thromboelastograph) were measured at baseline, after 45 min of CPB, at the end of CPB and 4 h post-operatively in 34 patients. ⋯ Addition of 10 mg/l recombinant factor XIII[a2] significantly increased clot strength. Postoperative bleeding at 2 h was inversely correlated with platelet count, factor XIIIA antigen and clot strength measured at the end of CPB. Maintenance of adequate platelet counts and factor XIIIA levels at the end of CPB may play a role in maintaining clot strength and reducing blood loss.
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Blood Coagul. Fibrinolysis · Mar 2001
Randomized Controlled Trial Clinical TrialEpsilon-aminocaproic acid promotes the release of alpha2-antiplasmin during and after cardiopulmonary bypass.
This double-blind, randomized study compared the mechanisms by which low-dose aprotinin and epsilon-aminocaproic acid (EACA) inhibited fibrinolysis during cardiopulmonary bypass surgery. D-dimer levels during and after bypass were similar, indicating an equivalent inhibition of fibrinolysis. ⋯ Compared with the aprotinin group, higher levels of the plasmin-alpha2-antiplasmin complex in the EACA group confirmed an increased inhibition of plasmin by alpha2-antiplasmin. In conclusion, it is hypothesized that EACA inhibited fibrinolysis by stimulating the release of the patients' own alpha2-antiplasmin.
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Blood Coagul. Fibrinolysis · Mar 2001
Reversible shear-mediated platelet dysfunction during cardiac surgery as assessed by the PFA-100 platelet function analyzer.
We undertook this investigation to assess alterations in shear-mediated platelet function during cardiac surgery and to determine the potential for the PFA-100 to predict post-operative bleeding. Platelet aggregation and PFA-100 closure times were determined in 18 adult patients at five intervals during cardiac surgery. Associations between post-operative bleeding and closure times were examined in an additional 58 patients. ⋯ Neither ex vivo correction of sample hematocrits nor supplementation with Humate P affected closure times. Positive and negative predictive values for post-CPB collagen/ADP closure times to predict bleeding were 18 and 96%, respectively. These results suggest that factors both intrinsic and extrinsic to the platelet contribute to reversible shear-mediated platelet dysfunction during CPB, and that the PFA-100 may prove useful after CPB to identify patients unlikely to benefit from platelet transfusions.
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Blood Coagul. Fibrinolysis · Mar 2001
Case ReportsThe management of von Willebrand's disease-associated gastrointestinal angiodysplasia.
There is a recognized association between von Willebrand's disease and gastrointestinal angiodysplasia. Most previous publications have been reports of the association itself and there is little published on the management and long-term follow-up of affected patients. We report our experience and follow-up of six patients, and review the previous literature.