患者男性，68岁，冠心病史10年，近1个月心绞痛频繁发作，休息时也有发作，心电图表现为ST段压低和T波改变。口服异山梨酯和美托洛尔治疗。冠状动脉造影示三支病变。拟行非体外循环下冠状动脉搭桥术。
此患者术前服用美托洛尔，术中出现心动过缓和低血压，应如何处理（）。
A.纠正低血容量
B.减浅麻醉
C.解除手术操作影响
D.多巴胺
E.必要时阿托品纠正心动过缓
参考答案：A, C, D, E
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| Dear Zhou Jun, Thank you for your letter. It's great to 1 you again. How's your study? I hope you can 2 all your exams to get into a high school. When I got your last letter, I was very 3 volunteering (志愿活动) in Ghana. So I had no time to write back. I just got back home last week. I've got so much to 4 you! It was my first time to be a volunteer. I 5 two months there, teaching in a very poor school. When I arrived, there were only six classes and three 6 ! I had my own 7 . There were twenty children in it. I could teach them anything I wanted. They love me very much. I was so 8 in Ghana. I slept in the same house with some of the children in my class. That was a (an) 9 experience for me! I'd love to 10 to Ghana in a few months to see them again. Well, good luck with your exams! Ben | ||||
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