胎盘附着于子宫下段,接近子宫内口或直接复盖在子宫内口上,称前置胎盘。它是妊娠晚期出血的主要原因之一,其主要表现为妊娠晚期自发的无痛性反复阴道流血。由于症状明显,诊断不难,往往出血开始就引起妇产科医生的重视。目前随着计划生育工作的深入开展,中期妊娠引产者逐日增多,如何及时发现和处理早期前置胎盘,减少并发症,是急待解决的问题。我们于1979 Placenta attached to the lower uterine segment, close to the mouth of the uterus or directly covered in the mouth of the uterus, said placenta previa. It is one of the major causes of bleeding in the third trimester of pregnancy and is characterized by spontaneous painless recurrent vaginal bleeding during late pregnancy. Obvious symptoms, the diagnosis is not difficult, often caused by obstetrics and gynecology doctor’s attention. At present, with the deepening of family planning work, the number of induced labor in mid-term pregnancy increases day by day. How to detect and treat the early placenta in time and reduce the complications is an urgent problem to be solved. We are in 1979