患者,女,33岁。孕3产1,末次月经1998年10月15日,平素月经规则,预产期1999年7月22日。1999年6月29日下午5时无明显诱因开始阴道流血伴流液,量多于月经量,色淡红,即到外院就诊,Ｂ超示:前置胎盘,胎儿偏小,遂予促胎肺成熟及抗感染治疗。6月30日外院查胎心基线高(158次/ｍｉｎ)而转 Patient, female, 33 years old. Pregnancy 3 1, the last menstrual October 15, 1998, normal menstrual rules, the expected date of July 22, 1999. June 29, 1999 5:00 no obvious incentive to start vaginal bleeding with fluid, the amount of more than the amount of menstruation, color pink, that is to the outer hospital, B ultrasound shows: placenta previa, the fetus is too small, then to promote fetal Lung maturity and anti-infective treatment. June 30 outside the hospital check fetal heart rate baseline high (158 times / min) and turn