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有关开瓣音正确的是()

单选题
2021-12-25 12:26
A、出现于心底部
B、音调低
C、开瓣音提示瓣膜弹性和活动性尚好
D、S2后0.05秒
E、历时较长而响亮
查看答案

正确答案
C

试题解析
又称二尖瓣开放拍击音。出现于心尖内侧S2后0.07秒。听诊特点为音调高、历时短促而响亮、清脆,呈拍击样;听到开瓣音提示瓣膜弹性和活动性尚好。

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