血栓形成现在仍然认为有三个必备条件:(1)重要的凝血因子在血液中的变化;(2)血管壁的变化;(3)血流淤滞。在血流比较缓慢的静脉内的血栓形成(静脉血栓又称红色血栓),血小板团块主要在静脉袋形瓣处比较局限地附着于血管壁,由局部产生的凝血酶使血小板凝集。因此抑制这种酶的药物如肝素和香豆素是临床上防止动脉血栓形成的有效药物。但是在血流比较快 Thrombosis is still believed to have three prerequisites: (1) changes in important blood clotting factors in the blood; (2) changes in the blood vessel wall; and (3) blood stasis. In relatively slow blood flow thrombosis (venous thrombosis, also known as red thrombus), platelet clumps mainly in the venous pocket flap more localized in the vessel wall, the local production of thrombin platelet aggregation. Therefore, drugs that inhibit this enzyme, such as heparin and coumarin, are clinically effective agents for preventing arterial thrombosis. But in the bloodstream faster