每隔两次正常心跳有一次室性期前收缩时属于() ["A.二联律","B.三联律","C.多源室性期前收缩","D.预激综合征","E.短暂性室性心动过速"]
房室交界组织节律点每分钟发出的冲动为()。 ["A.40~50次/分","B.60~80次/分","C.80~100次/分","D.100~120次/分","E.120~160次/分"]
简述正常胎盘剥离的表现。
苯妥英钠治疗洋地黄中毒所致室上性心动过速,急用时可静脉推注() ["A.100mg/5~10min","B.50mg/5~10min","C.150mg/5~10min","D.200mg/5~10min","E.250mg/5~10min"]
产后2小时观察的主要内容有哪些?
简述预防产后出血的护理措施