Objective To evaluate the effects of Pituitrin was injected in lower uterine segment in the treatment of placenta previa. Methods 36-40+weeks of placenta previa cesarean section pregnancy were randomly devided into two groups. Experimental group:pituitrin 6 u plus normal saline 9 mL were injected in the musle layer of the lower uterine segment placental abruption after delivery of the placenta, each point 1-2 mL;pituitrin can be used continuously until no bleeding of uterus. The maximum dose was 12 U. The other treatment was the same as control group. Results Two groups in the hemostatic time , bleeding amount of postpartum hemorrhage comparison , There was a significant difference (P<0.05) . While in operation time, there was no significant difference between the two groups . Conclusion It is effective, safe and timely hemostasis that the lower uterine segment injection of pituitrin in the treatment of placenta previa. It can significantly reduce the amount of postpartum hemorrhage .%目的：探讨子宫下段注射垂体后叶素治疗前置胎盘出血的临床疗效。方法对妊娠36～40+周前置胎盘剖宫产的孕妇，随机分成试验组和对照组，试验组：胎盘娩出后以垂体后叶素6 U加生理盐水9 mL，于子宫下段胎盘剥离处肌层分多点注射，每点1～2 mL；如再出血可继续注射至无出血，最大剂量不超过12 U：其余处理方法同对照组；对照组：常规处理（宫肌注缩宫素、欣母沛，压迫、按摩子宫、出血处8字缝扎或补丁式缝合止血）。结果两组产妇在手术止血时间[（4±1.4）∶（24±2.5）min]、产后出血量[（884±401）∶(1902±827) mL的比较，差异有统计学意义(P<0.05)，而在手术时间方面两组比较则差异无统计学意义。结论子宫下段注射垂体后叶素治疗前置胎盘出血疗效确切，止血迅速，安全可靠，可明显减少产后出血量。
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