肺栓塞是一种对患者健康甚至生存带来很大威胁的严重心肺疾患。在美国，静脉血栓引起的肺栓塞成为继急性心肌缺血综合征和中风之后的第3位最常见的心血管疾患，每年约有650，000例患者发病，300，000例需要住院治疗，50，000例死亡「1,2］。在日本，肺栓塞被列为‘讲非少见”的 Pulmonary embolism is a serious heart and lung disease that poses a great threat to the health and even survival of patients. In the United States, PE caused by venous thrombosis becomes the third most common cardiovascular disease following AMI and stroke, with about 650,000 episodes each year, 300,000 requiring hospitalization, and 50 , 000 deaths. “1,2 In Japan, pulmonary embolism is classified as” non-infrequent. "