下肢深静脉血栓形成 (DVT)及其继发的肺梗死是妊娠期及产褥期危及母体和胎儿安全的主要疾病之一 ,患DVT的孕妇并存高血压、流产及生产低体重儿的概率明显增加[1] ,DVT继发的肺梗死可导致产妇死亡。因此妊娠期下肢DVT的治疗是一个重要课题 ,而其诊治与非妊娠期下肢DVT有明显不同 Lower extremity deep venous thrombosis (DVT) and its subsequent pulmonary infarction are one of the major diseases that endanger maternal and fetal safety during pregnancy and puerperium. The incidence of hypertension, abortion and the birth of low birth weight children are significantly increased in pregnant women with DVT [ 1], pulmonary infarction secondary to DVT can lead to maternal deaths. Therefore, the treatment of lower extremity DVT during pregnancy is an important issue, and its diagnosis and treatment of non-pregnant lower extremity DVT are significantly different