病历摘要：患者男性，72岁。拟行阑尾切除术。除偶有胸闷外，无其他特殊病史。术前检查：Hb110g／L，WBC8．9×109／L，ECG示Ⅱ、Ⅲ、avF导联S-T段下移超过0．05mv。下面哪项是老年人麻醉后循环抑制的主要原因（）_福建住院医师麻醉科(综合练习)_全学科试题题库

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病历摘要：患者男性，72岁。拟行阑尾切除术。除偶有胸闷外，无其他特殊病史。术前检查：Hb110g／L，WBC8．9×10⁹／L，ECG示Ⅱ、Ⅲ、avF导联S-T段下移超过0．05mv。下面哪项是老年人麻醉后循环抑制的主要原因（）
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