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男性，39岁，在心脏手术过程中，突然出现Ⅲ度房室传导阻滞，术者检查无心脏传导束缝扎，此时该用哪药作为急救处理（）。
A . 静注阿托品
B . 静滴异丙肾上腺素
C . 静注肾上腺素
D . 静滴麻黄碱（麻黄素）
E . 静滴去甲肾上腺素
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