单项选择题

患者女，66岁。患慢性心功能不全。按医嘱给予地高辛0.25mg.每日1次，护士发药前应首先

A.了解心理反应
B.测脉率（心率）及脉律（心律）
C.观察意识状态
D.测量血压
E.检查瞳孔
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