妊娠20周后或分娩期,正常位置的胎盘在胎儿娩出前部分或全部从子宫壁剥离称为胎盘早期剥离。胎盘早剥时底蜕膜层出血,形成血肿,使胎盘自附着处剥离,如剥离面小,血浆很快凝固,临床可无症状,只是凝血块压迫胎盘,在胎盘母体面上遗留压迹。如剥离面大,继续出血,则形成胎盘后血肿,若出血冲开胎盘边缘,沿胎膜与子宫壁之间向子宫颈口 20 weeks after pregnancy or childbirth, the normal position of the placenta in part or all of the fetus before childbirth is exfoliated from the uterine wall called early placental dissection. At the end of placental abruption decidual layer bleeding, the formation of hematoma, so that the placenta from the attachment of peel, such as the peeling surface is small, fast plasma coagulation, clinical asymptomatic, but the blood clot pressure placenta, plaque left in the placenta. Such as peeled face, continue to hemorrhage, the formation of placental hematoma, bleeding if the edge of the placenta puncture along the membranes between the uterine wall and the cervix to the mouth