何平凶险性前置胎盘课件

evia . Marginal placenta previa : The placenta is implanted at the margin of the internal cervical os, within 2 cm. If the placenta is seen to be more than 2 cm from the internal os, the rate of antepartum or intrapartum hemorrhage is not increased. 6临床特点?既往有剖宫产史的孕妇在孕中晚期出现无痛性阴道流血、先露高浮、异常胎产式等,应警惕! ?影像学证据:胎盘位于子宫下段并覆盖子宫瘢痕时即可明确诊断?发生产前出血的早晚及出血量多少往往与前置胎盘类型相关?中央型前置胎盘患者孕晚期若无异常阴道流血应警惕完全性胎盘植入 7胎盘植入分类?按植入的面积分完全性和部分性胎盘植入?根据绒毛植入的深浅分 3种: 侵入性胎盘( placenta accreta ):胎盘绒毛侵入子宫肌层浅层,其间无蜕膜组织相隔植入性胎盘( placenta increta ):胎盘绒毛侵入子宫肌层深层穿透性胎盘( placenta percreta ):胎盘绒毛穿透子宫肌层达浆膜层,有时甚至穿透浆膜至腹腔 8910 Cesarean hysterectomy specimens with placenta percreta. Total placenta previa with percreta involving the lower uterine segment and cervical canal. Black arrows show the invading line of the placenta through the myometrium