单选题:强心苷治疗心房颤动的主要机制是

题目内容:
强心苷治疗心房颤动的主要机制是 A.缩短心房有效不应期
B.延长心房有效不应期
C.降低窦房结自律性
D.降低心房异位节律点自律性
E.减慢房室传导

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