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  • Title: Anti-thormbin III and heparin clotting times in thrombosis and atherosclerosis.
    Author: O'Brien JR.
    Journal: Thromb Diath Haemorrh; 1974 Sep 30; 32(1):116-23. PubMed ID: 4454034.
    Abstract:
    A survey of the literature shows that when whole blood clots thrombin is formed and there is a decrease in anti-thrombin III (Anti-Th. III) and an increase in heparin neutralizing activity (HNA) which is probably identical to platelet factor 4 derived from platelets. Many studies of atherosclerosis and of arterial and venous thrombosis using various tests thought to measure Anti-Th. III and HNA report a decrease in Anti-Th. III or an increase in HNA or both. We have measured both in patients with atherosclerosis and survivors of myocardial infarction. The HNA was increased and the serum anti-thrombic activity was decreased relative to controls and there was an inverse correlation between the two measurements. All this evidence suggests that some kind of mild chronic intravascular coagulation may occur in atherosclerosis. These changes could be related to the cause or the result of atherosclerosis.
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