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当前学科：麻醉学(综合练习)
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患者女性，59岁。慢性胆囊炎、胆石症急性发作。高血压、冠心病（心绞痛）10年，ECG示冠状动脉供血不足，心率66次/分，血压185/100mmHg。行胆囊切除加胆总管探查T形管引流术，术中处理胆囊时突然心率减慢、室性二联律。预防该病人上述不良反应的最好办法是（）
A . 术前肌注阿托品
B . 不牵拉胆囊
C . 胆囊三角区神经局麻药封闭
D . 静注异丙肾上腺素
E . 静注氯胺酮
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