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  • Title: Time courses of the antithrombotic effects, bleeding enhancing effects and interactions with factors Xa and thrombin after administration of low molecular weight heparinoid Org 10172 or heparin to rats.
    Author: Hobbelen PM, Vogel GM, Meuleman DG.
    Journal: Thromb Res; 1987 Dec 01; 48(5):549-58. PubMed ID: 3481660.
    Abstract:
    Time response curves of the anti-thrombotic effects, bleeding enhancing effects, effects on APTT, anti-Xa activities, anti-thrombin activities and thrombin generation inhibitory activities of the low molecular weight heparinoid Org 10172 and heparin have been compared in rats. The time courses of these effects were similar for heparin but quite different for Org 10172. Org 10172 induced anti-thrombotic and anti-Xa effects which lasted approximately 3 times longer than those at the same anti-Xa doses of heparin, whereas the bleeding enhancing effects and effects on APTT of Org 10172 were of shorter duration than those of heparin. The half-life of the anti-thrombin effect after Org 10172 seemed somewhat longer than after heparin administration. Thrombin generation inhibition by Org 10172 showed a slightly longer duration than by heparin. The similarities between the time courses of the anti-thrombotic effect and the anti-Xa activity after Org 10172 administration suggest that the most appropriate parameter to monitor Org 10172 treatment is the plasma anti-Xa level.
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