试题与答案

风湿性心脏病二尖瓣狭窄者，二尖瓣口面积狭窄达多少即可引起血流动力学障碍（）A．＜1.

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题型：单项选择题

题目：

风湿性心脏病二尖瓣狭窄者，二尖瓣口面积狭窄达多少即可引起血流动力学障碍（）

A．＜1.0cm2

B．＜0.75cm2

C．＜1.5cm2

D．＜2.0cm2

E．＜3.0cm2

答案：

参考答案：D

解析：

[解题思路] 二尖瓣口面积正常是4～6cm2。舒张期房室间无跨瓣压差。瓣口面积＜2.0cm2时(轻度狭窄)，此时已有异常的跨瓣压差，靠此推动血液自左房流入左室；当瓣口面积＜1.5cm2。(中度狭窄)时，临床上可有明显症状；当瓣口面积＜1.0cm2 (重度狭窄)时，则跨瓣压差＞20mmHg，左心房压明显升高产生肺静脉、肺毛细血管压被动性升高并引起肺动脉高压。

[命题规律] 考查“二尖瓣狭窄”。必须掌握。

考点：中医执业医师中医执业医师
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