单选题：护士巡视时，发现患者烦躁不安，呼吸频率及心率加快，球结膜充血，应该

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题目内容：

护士巡视时，发现患者烦躁不安，呼吸频率及心率加快，球结膜充血，应该 A．使用镇静剂
B．加大氧流量
C．使用呼吸兴奋剂
D．降低氧浓度
E．作气管切开准备

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