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引起左室后负荷增高的主要因素是()。

单选题
2021-12-23 14:21
A、肺循环高压
B、体循环高压
C、回心血量增加
D、主动脉瓣关闭不全
E、红细胞压积增大
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正确答案
B

试题解析
前负荷是指心肌收缩之前所遇到的阻力或负荷,即在舒张末期,心室所承受的容量负荷或压力就是前负荷。在临床上,测定心室容量比较困难,通常情况下用心室的舒张末压作为指标,相对来说回心血量增多,心室的前负荷增加。后负荷是指心肌收缩之后所遇到的阻力或负荷,又称压力负荷。主动脉压和肺动脉压就是左、右心室的后负荷。取决于主动脉的顺应性、血液黏度、外周血管阻力等。

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