1临床资料患者36岁,孕2产1,因“停经22周,胎动消失2d,牙龈出血7h”于2008年11月13日4:55急诊入院。患者末次月经2008年5月27日,未产检,入院前2d开始未觉胎动,未重视,入院前1d夜间无明显诱因出现牙龈出血,后来我院急诊就诊,超声示:无胎心搏动,胎盘位于右前壁,胎盘内低至无回声区 1 clinical data of 36-year-old, 2 pregnancies 1, due to “menopause 22 weeks, fetal movement disappeared 2d, bleeding gums 7h” at November 5, 2008 4:55 emergency admission. The patient’s last menstrual period May 27, 2008, no childbirth, 2d before admission did not feel fetal movement, did not pay attention, 1d night before admission no obvious incentive bleeding gums, and later our hospital emergency treatment, ultrasound showed: no fetal heartbeat, placenta Located in the right anterior wall, the placenta as low as no echo zone