1临床资料患者,女,23岁,因“妊娠10月,要求剖宫产”为主诉于2010年4月1日入院。末次月经(last menstrual period,LMP)2009-07-04,预产期(expected date of confinement,EDC)2010-04-01。患者平素月经规则,30 d 1次,停经40 d左右自测尿人绒毛膜促性腺激素(human chorionic gonadotrophin,HCG)阳性,孕4个月感胎动,孕中晚定期产前检查无特殊,否认孕期阴道流血、流液史,否认射线接触史,否认皮肤瘙痒及胸闷、心悸 1 clinical data of patients, female, 23 years old, due to “pregnancy in October, requiring cesarean section ” as the chief complaint on April 1, 2010 admission. Last menstrual period (LMP) 2009-07-04, expected date of confinement (EDC) 2010-04-01. Patients usually menstrual rule, 30 d 1, about 40 days after menopause self-test urinary human chorionic gonadotrophin (HCG) positive, 4 months pregnant fetal movement, regular middle and late pregnancy prenatal examination no special, denied Vaginal bleeding during pregnancy, fluid history, denied the history of radiation exposure, itchy skin and denied the skin, heart palpitations