单项选择题
A.心室纤颤 B.心房纤颤 C.房室传导阻滞 D.室速 E.窦性心律失常
A.31~40岁占2% B.41~50岁占6% C.51~60岁占23% D.61~70岁占45% E.71~80岁占100%