前五胎盘是妊娠晚期或分娩期阴道出血的最常见原因，由于大量出血可危及母胎生命。我们在严密观察下对４２例前置胎盘采用期待疗法，取得了较好的疗效，现报道如下。１临床资料１．１一般资料１９９５年１月至１９９８年１２月在我院产科分娩的产妇共 ５ ６４１例，其中前置胎 The first five placentas are the most common causes of vaginal bleeding in late pregnancy or childbirth, which can be dangerous to maternal-fetal life due to massive bleeding. We closely observe the 42 cases of anterior placenta using expectant therapies, and achieved good results, are reported below. 1 Clinical data 1.1 General Information January 1995 to December 1998 in our hospital obstetric delivery of a total of 5 641 mothers, of which the front tire