患者农民,27岁。停经5个月,第1胎,因阴道不规则流血伴下腹部隐痛4小时,而来作Ｂ超检查。Ｂ超检查:宫腔内单胎妊娠,双顶径约5ｃｍ,四肢齐全,脊柱排列整齐,胎心率148次/分,羊水深度约5～55ｃｍ,透声良好。并见胎动现象。胎盘位于子宫前壁偏低,厚约2ｃｍ,Ⅰ级。宫腔底部偏左见85ｃ Patient farmer, 27 years old. Menopause 5 months, the first child, due to irregular vaginal bleeding with abdominal pain for 4 hours, and for B-ultrasound. B-ultrasound: intrauterine singleton pregnancy, biparietal diameter of about 5cm, complete limbs, spine arranged neatly, fetal heart rate 148 beats / min, amniotic fluid depth of about 5 ~ 55cm, sound through well. And see the fetal movement phenomenon. Placenta is located in the anterior wall of the uterus is low, about 2cm, Ⅰ grade. Uterine bottom left see 85c