急性心肌梗死左心功能不全伴频发多源室性期前搏动，用利多卡因无效，应首选下列哪种药物治疗（）。
A.普鲁卡因酰胺
B.普罗帕酮
C.胺碘酮
D.氨酰心胺
E.维拉帕米
参考答案：C
解析：普鲁卡因酰胺、普罗帕酮、胺碘酮、氨酰心胺这四种抗心律失常药物对急性心肌梗死所致的室性早搏都可有效，而普鲁卡因酰胺、普罗帕酮和氨酰心胺都伴有较明显的负性肌力作用，而胺碘酮的此种作用明显较弱，因患者为急性心梗伴左心功能不全，宜选用对心肌抑制作用较弱的药物，所以胺碘酮为最合适的选择。
| 完形填空 You may not realize it, but you are doing much more than just studying when you are at school. School is also the place __1__you socialize and learn to get along with people. But this is __2__easy. What can you do __3__you just don't like one of your classmates? If you discover that you have problems __4__your classmates or friends, the most important thing to learn is tolerance(宽容). Tolerance is the __5__to recognize and respect the __6__in others. We cannot change the way that other people act, __7__it is important to learn to live happily with them. Practicing tolerance will allow everyone to form better __8__with each other. Getting to know someone __9__help you understand why they do things __10__from you. It is important to remember that just because something is different does not mean that it is bad. Tolerance __11__us to keep an even temper and open mind. One thing to __12__is the old saying, "Treat others how you want __13__". You would like to be treated kindly by your classmates, so it is __14__to treat them with equal kindness. If you tolerate__15__it does not mean that you have to like it. No one is asking you to __16__who you are or what you believe in. Tolerance just means that you will be __17__of the differences in others and not try to make them change. It is important to ___18__tolerance because it will make everyone's lives easier. Learn to __19__people for their different abilities and interests. The world is a very __20__place, and practicing tolerance in your own school and city can help make a difference. | ||||
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