1. Objective To analyze the missed diagnostic causes of placental abruption antepartum and increase the accuracy of prenatal diagnosis. 目的分析胎盘早剥产前漏诊的原因，提高产前诊断的准确性。
2. In this retrospective cohort, all women with antepartum GBS bacteriuria in a research registry were included. Controls were women with negative urine cultures. 在这个回顾性队列中，所有登记了的产前有B型链球菌菌尿的妇女都包含在其中，对照组是尿培养阴性的妇女。
3. So antepartum monitoring, prevention and termination of regnancy at the right time is necessary to improve the perinatal outcome and degrade the perinatal fatality. 必须加强产前监护，积极防治子痫前期，并适时终止妊娠，以改善围生儿结局，降低围生儿死亡率。
