09第九章弥散性血管内凝血详解.ppt

Common causes of DIC. 感染性疾病细菌感染败血症、内毒素血症、病毒性肝炎、流行性出血热 广泛组织损伤大面积挫伤或烧伤、挤压综合症、大手术、器官移植 产科意外胎盘早剥、羊水栓塞、宫内死胎、妊娠中毒症、流产术 恶性实质肿瘤肺、消化系及泌尿系癌、转移癌、恶性葡萄胎、绒毛膜上皮癌 急性白血病急性早幼粒白血病 其他疾病内毒素休克、严重出血或过敏性休克、大面积心肌梗死、异型输血、巨大海棉状血管瘤、肾小球肾炎、类风湿关节炎、系统性红斑狼疮、肾移植排斥反应 外源性凝血系统: 15 seconds;内源性凝血系统, 1-6 min Clotting factors from livers: I, II, V, VII, IX, X, XI, XII, XIII From Platelet: III, IV(Ca2+), VIII, XIII From endothelial cells: VIII 高分子激肽原, 前激肽释放酶 are synthesized in the liver VIIIa increase the speed of the reaction from X to Xa 200,000-fold faster. IV: Ca2+ Source: Liver: fibrinogen (I), prothrombin (II), V,VII,IX,X,XI,XII,XIII Platelets: III, V,VIII,, XIII Endothelial cells: VIII, XIII Thrombin activates factor V VIII 组织因子 is a cofactor, it make VIIa 1000-fold more active; VIIIa increase the speed of the reaction from X to Xa 200,000-fold faster. 凝血酶激活:V, VIII, XII, PROTHROMBIN, The injured tissues and endothelium very slowly release tissue plasminogen activator (t-PA；组织纤溶酶原激活物) a day or later after clot is formed and convert plasminogen to plasmin. Plasmin具有广泛的丝氨酸水解酶活性，能水解凝血终产物fibrin生成可溶性的纤维蛋白降解产物（fibrin degradation products, FDP），也能水解fibrinogen和其他多种coagulation factors、血浆蛋白与组织蛋白。 尿激酶原 is from kidney. 纤溶酶原激活物抑制物(PAIs)：from endothelium and platelets In patients with disseminated intravascular coagulation, fibrin is formed as a result of the generation of thrombin mediated by tissue factor. Tissue factor, expressed on the surface of activated mononuclear cells and endothelial cells, binds and activates factor VII. The complex of tissue factor and factor VIIa can activate factor X directly (black arrows) or indirectly (white arrows) by means of activated factor IX and factor VIII. Activated factor X, in combination with factor V, can convert prothrombin (factor II) to thrombin (factor IIa). Simultaneously, all three physiologic means of anticoagulation — antithrombin III, protein C, and tissue factor–pathway inhibitor (TFPI) — are impaired. The resulting intravascular formation of f