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日本产妇死亡率由于出血、感染、妊娠毒血症等的减少而有逐年下降的趋势,但在产妇死亡中肺栓塞死亡所占比例却急剧增加。有人认为,由于妊娠过程中子宫体不断增大,使下肢及骨盆内静脉血瘀滞,以及血液凝固功能亢进等,使妊娠期发生静脉血栓的危险性增加约6倍。除妊娠是肺栓塞较大的危险因素外,高龄及多产也是重要因素。一般认为,40岁以上,有4次以上妊娠史的孕妇发生肺栓塞的危险性,是30岁以下初产妇的20倍。剖腹产发生肺栓塞的危险性是自然分娩的20倍。东京大学医院近十年的分娩统计分
The maternal mortality rate in Japan has been declining year by year due to the decrease of bleeding, infection and pregnancy toxemia, but the proportion of deaths due to pulmonary embolism has increased dramatically in maternal deaths. Some people think that due to the growing uterus during pregnancy, so that lower extremities and pelvic venous blood stasis, as well as blood coagulation and so on, so that the risk of venous thrombosis during pregnancy increased by about 6 times. In addition to pregnancy is a larger risk factor for pulmonary embolism, the elderly and prolific is also an important factor. It is generally believed that the risk of pulmonary embolism in pregnant women over the age of 40 with more than 4 pregnancy history is 20 times that of primipara under 30 years of age. Caesarean section of the risk of pulmonary embolism is 20 times the natural childbirth. Tokyo University Hospital nearly ten years of childbirth statistics