【单选题】【消耗次数：1】
二尖瓣狭窄第一心音亢进是因为
①
心脏开始收缩时，二尖瓣处于较低位置
②
心脏开始收缩时，二尖瓣后叶关闭延迟
③
心脏收缩力加强
④
二尖瓣前叶增厚
⑤
乳头肌功能失调
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相关题目
【多选题】
一风心病二尖瓣狭窄病人，超声心动图示二尖瓣钙化、僵硬。对该病人心脏听诊时，哪项正确
①
A.心尖区舒张期隆隆性杂音
②
B.心尖区第一心音亢进
③
C.肺动脉第二音亢进
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D.心尖区未闻及开瓣音
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