患者急性下壁心肌梗死出现心率慢至40/分钟，并出现P波与QRS波分_爱下问搜题

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问题单项选择题 B型题

患者急性下壁心肌梗死出现心率慢至40/分钟，并出现P波与QRS波分离，考虑（）

A.窦性心动过速

B.室性期前收缩

C.心房颤动

D.室性心动过速

E.三度房室传导阻滞

答案

参考答案：E

解析：1.患者近期进食少，出现容量不足，出现窦性心动过速。2.洋地黄中毒最常见心律失常是室性期前收缩二联律。3.P波消失，出现f波，且R-R间期绝对不等，心房率400/分钟，室率为130／分钟是房颤心电图表现。4.出现规律的宽大畸形QRS波最可能为室性心动过速。5.心率慢至40/分钟，并出现P波与QRS波分离，考虑三度房室传导阻滞。

完形填空

Everyone wants to win a first-place blue ribbon, to be the best in something. Even kids in Kindergarten want that blue ribbon. In sports, I was never a blue-ribbon person. In a race, I was always 36 . In baseball I was likely to be 37 on the head or drop the ball. During the spring of my kindergarten year, our class had a field trip to a park in a town about twenty miles away. Making that drive now is no big 38 but when you’re six and you’ve lived in a town of 300 people all your life, going to a big town of a couple of thousand people is really something.
I don’t remember too much about it. But there was one that I will never forget —the __39__ race. The parents tied our feet together. One little boy got me for a 40 . He was the second most   41 boy in our class so he usually won at everything and I knew that with me tied to him he didn’t have a chance. And I’m sure he knew he was in trouble. The gun sounded and we were off. Some couples were falling and stumbling all around us, 42   we stayed on our feet and made it to the other side. 43 , when we turned around and headed back for home, we were in the lead! Only one couple had a chance to win, and they were a good several yards behind us.
A few feet from the finish line, disaster struck: I tripped and fell. We were   44 enough that my partner could have easily dragged me across the finish line and won. But he didn’t. Instead he stopped,   45   down and helped me up — just at the other couple crossed the finish line. As a result, we received a small red ribbon for coming in second.
I still remember that moment when the young boy decided that helping a friend get on her feet was more important than winning a blue ribbon. And 13 years later, I still have that little ribbon because it’s a   46   that a friend like this boy is one who really   47 .

C．three-legged

D．four-legged

B．Unbelievably

D．Undoubtedly

填空题

电阻、感抗、容抗三者间的（）和称电路的阻抗。