摘要: The annual incidence of diagnosed venous thromboembolism (VTE) is 1 to 2 events per 1000 the general population. VTE very uncommon before age 20 years and, after 40 age, about doubles with each decade. Over half episodes are deep vein thrombosis (DVT), and three quarters first episodes. similar in men women lower Asians than it Caucasians or Africans. Hereditary risk factors include factor V Leiden mutation; G20210A prothrombin gene deficiencies protein C, S, antithrombin. Hyperhomocysteinemia elevated levels I, VIII XI, which may be hereditary and/or acquired, also factors. Acquired malignancy, hospitalization, surgery, trauma, immobilization, estrogen therapy, pregnancy, antiphospholipid antibodies. Risk for a episode generally recurrence, although associated relative differ subsequent event.