在探测二尖瓣或左室流出道血流频谱时，有时会出现两种时相不同、方向相异的血流信号，使频

发布时间：2017-08-10 22:03 │ 来源：www.tikuol.com

题型：单项选择题 A型题

问题：

在探测二尖瓣或左室流出道血流频谱时，有时会出现两种时相不同、方向相异的血流信号，使频谱变形，原因是（）。

A.所探测部位有双期逆向血流

B.局部有异常血管瘘

C.二尖瓣有反流

D.主动脉瓣有反流

E.由于取样容积位置不当，随心脏舒缩，同一取样位置在舒张期为左室流入道，而收缩期成为左室流出道所致

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