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男性，75岁，心绞痛发作持续4小时，含硝酸甘油无效。心电图示Ⅱ、Ⅲ、AVF导联呈弓背样抬高6mm，V1～V3导联ST段水平样压低4mm，偶发室性早搏1次，诊断为急性心肌梗死10小时后出现烦躁不安，血压偏低，心率45次／分，心电示Ⅲ度房室传导阻滞，频发，此时治疗应首先A.
静滴肾上腺素
B.
静滴普罗帕酮
C.
应用升压药
D.
临时心脏起搏
E.
静滴阿托品
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