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Blood, 26 February 2009, Vol. 113, No. 9, pp. 2070-2078. Prepublished online as a Blood First Edition Paper on October 17, 2008; DOI 10.1182/blood-2008-07-167411.
Submitted July 9, 2008
Institute of Cardiology, Jagiellonian University School of Medicine, Krakow, Poland * Corresponding author; email: kenneth.mann{at}uvm.edu.
We evaluated the systemic alterations on the blood coagulation system which occur during a coronary thrombotic event. Peripheral blood coagulation in individuals with acute coronary thrombosis was compared with that for individuals with stable coronary artery disease (CAD). Blood coagulation and platelet activation at the site of microvascular injury were assessed by using immunochemistry in 28 non-anticoagulated patients with acute myocardial infarction (AMI) versus 28 stable CAD patients matched for age, sex, risk factors, and medications. AMI was associated with increased maximum rates of thrombin-antithrombin complex generation (by 93.8%; P<0.001), thrombin B-chain formation (by 57.1%; P<0.001), prothrombin consumption (by 27.9%; P=0.012), fibrinogen consumption (by 27.0%; P=0.02), factor (f) Va light chain generation (by 44.2%; P=0.003), and accelerated fVa inactivation (by 76.1%; P<0.001), along with enhanced release of platelet-derived soluble CD40 ligand (by 44.4%; P<0.001). FVa heavy chain availability was similar in both groups owing to enhanced formation and APC mediated destruction. The velocity of coagulant reactions in AMI patients showed positive correlations with interleukin-6. Heparin treatment led to dampening of coagulant reactions with the profiles similar to those for stable CAD. In conclusion, AMI-induced systemic activation of blood coagulation markedly modifies the pattern of coagulant reactions at the site of injury in peripheral vessels compared with that in stable CAD patients.
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