问题 问答题 简答题

心脏药物负荷试验心血池显像有何临床意义?

答案

参考答案:

多巴酚丁胺主要作用于心脏的β[1.gif]受体,使心率加快,收缩压升高,心肌收缩力加强,心肌耗氧量增加,其作用机制基本与运动试验相似,但不同的是,小剂量多巴酚丁胺不仅不会抑制心肌收缩,反而对冬眠心肌有促进收缩的作用,因此,被用于心肌梗死病人存活心肌的检测。如果病人在安静状态下,局部心肌收缩降低,室壁运动低下,用小剂量多巴酚丁胺[<lOμg/(kg·min)]后,心肌室壁运动增强,表明心肌是存活的,只有大剂量[>20μg/(kg·min)]时,心肌缺血明显,局部收缩功能降低,使整体和局部EF下降,最大用量可至40μg/(kg·min),但要慎用。

阅读理解

根据短文内容,判断句子正“T”、误“F”。 

     An old man was sitting in front of his house. Just then, a young man walked up to him, "Excuse me, 

what kinds of people live in this town?" asked the young man.       

     "What kinds of people lived in the town you left?" the old man, replied with a smile. "Oh,  they were

 unkind and angry. I couldn't wait to leave. "said the young man."Then those are exactly the same kinds

 of people you will find in this town. You might not be happy here."After     hearing his words, the young

 man moved on.       

     About an hour later, another young man walked to the old man with a big smile on his face."Good 

afternoon, sir. Could you tell me what kinds of people live in this town?" the young man asked. "What 

kinds of people lived in the last town you lived in?" the old man asked. "Oh, they were amazing! They 

were polite and helpful. I really didn't want to leave," answered the young man."You'll find the same kinds of people in this town…Welcome! I hope you decide to stay here."    

( )1. The old man was playing chess when a young man walked to him.                  

( )2. The first young man wanted to ask him the way to the nearest town.              

( )3. The second young man was from a town where people were very polite and helpful.

( )4. The first young man decided to stay after hearing the old man's answer.        

( )5. The old man hoped the second young man would live in his town.                  

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