题目内容

下列说法中正确的是

A. 心瓣膜病、心功能差及病情严重者、甲状腺功能低下者镇静及镇痛药的剂量应减少
B. 急诊手术因未禁食，发生误吸胃内容物的可能性增加，应提前给予非特异性抗酸药
C. 为防止药物可能有害的相互作用，选择术前用药时应了解患者目前的用药情况
D. 精神紧张焦虑者，可于手术前晚口服催眠药或镇静药
E. 术前应根据不同的给药途径选择不同给药时间

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