前置胎盘为妊娠期严重的并发症,是妊娠晚期出血常见病因,对母婴均造成极大的危害。现我院对妊娠未足月前置胎盘患者,使用盐酸苄羟麻黄碱(安宝)行期待疗法,在保证孕妇安全前提下,延长胎龄,使其达到或接近足月,从而提高胎儿成活率,取 Placenta previa severe complications during pregnancy, is a common cause of bleeding in the third trimester, both mother and child caused great harm. Now in our hospital on pregnancy is not full month placenta previa patients, the use of benzalkonium chloride (Anbao) expectant therapy, to ensure the safety of pregnant women, to extend the gestational age to reach or near full-term, thereby enhancing the survival of the fetus Rate, take