【单选题】【消耗次数：1】
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随机题目
【单选题】
强心苷提高心肌收缩力的作用机制是（ ）
①
激活心肌细胞上的Na\super+\nosupersub ，K\super+\nosupersub -ATP酶，提高细胞内钙离子浓度
②
激活心肌的β受体，提高细胞内cAMP浓度
③
抑制心肌细胞膜上的Na\super+\nosupersub ，K\super+\nosupersub -ATP酶，提高细胞内钙离子浓度
④
提高交感神经活性
⑤
阻止细胞外钙离子内流
【单选题】
下列情况不宜用血管扩张剂治疗心力衰竭的是（ ）
①
心力衰竭伴低血压或血容量不足
②
心力衰竭伴高血压
③
心力衰竭伴低血钾
④
心力衰竭伴心动过缓
⑤
心力衰竭伴心房纤颤