The Impact of Different Anticoagulant Therapy on Hemorrhage and Coagulation After Thoracic Surgery

Inclusion Criteria: * clinical diagnosis of esophageal carcinoma and planned for esophagectomy * clinical diagnosis of lung carcinoma and planned for lung resection * general anesthesia combined with epidural anesthesia Exclusion Criteria: * blood clotting disfunction before surgery * anticoagulating or antiplatelet history before surgery * low blood platelets count * hemorrhagic disease * cerebral hemorrhage * cerebral,spinal,ophthalmologic operation history * peptic ulcer * bleeding\>400ml in operation * bleeding\>100ml/h after operation * blood transfusion in or after operation * severe renal or liver disfunction * severe hypertension