妊娠晚期出血有前置胎盘、胎盘早剥、胎盘边缘血窦破裂出血和帆状胎盘血管前置破裂等疾病,其中以前置胎盘最常见.我院在1980年1月至1990年12月住院分娩病人中,前置胎盘分娩88例,占分娩总数0.67%.其中低置胎盘40例,边缘性或部分性前置胎盘33例,中央性前置胎盘15例.产前根据临床和B 超检查结果作诊断,产后检查胎盘位置及外观 Bleeding in the third trimester of pregnancy placenta previa, placental abruption, placental marginal sinusoidal hemorrhage and placenta previa rupture of blood vessels and other diseases, of which the most common placenta previa in our hospital in January 1980 to December 1990 hospital delivery Among the patients, 88 cases were delivered by placenta previa, accounting for 0.67% of the total number of deliveries, including 40 cases of low placenta, 33 cases of marginal or partial placenta previa, and 15 cases of central placenta previa.According to clinical and B-ultrasound Results for diagnosis, postpartum examination of placental location and appearance