患者，女，38岁。妊娠26周，阴道不规则流血，伴腹痛。妇科检査:子宫体压痛，宫底位于脐上3横指。实验室检査:血红蛋白浓度92g/L，红细胞平均血红蛋白含量25Pg。彩超:后壁胎盘，厚度约1.8cm,胎盘后可见1.8cmxl.5cmx2.3cm液性低回声区。该病的西医治疗原则是

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