患者,23岁,农民,住院号3146,因预产期超过16天,于1992年3月27日以“孕1产0。孕42 w~(+4)头位待产”收住本科。孕期经过良好。入院查体:生命体征正常,心肺正常,腹部无压痛及反跳痛,双下肢未见浮肿。产检:胎头高浮,余未发现异常。血尿常规正常。3月30日B超示.双顶径91mm,胎盘附着于子宫左前壁, Patient, 23 years old, farmer, hospital number 3146, because of the expected date of delivery for more than 16 days, on March 27, 1992 to "pregnancy 1 production 0. pregnant 42 w ~ (+4) Good pregnancy. Admission examination: vital signs normal, normal heart and lungs, abdominal tenderness and rebound tenderness, no swelling of both lower extremities. Inspection: fetal head floating, I found no abnormalities. Hematuria routine normal. March 30 B-show. Double top diameter 91mm, the placenta attached to the left anterior wall of the uterus,