【单选题】【消耗次数：1】
硝酸甘油治疗充血性心力衰竭的主要机制是
①
直接扩张心内膜下血管
②
降低心肌耗氧量
③
扩张动脉，降低心脏后负荷
④
扩张静脉，降低心脏前负荷
⑤
扩张冠状动脉，改善心肌供血
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相关题目
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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
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心力衰竭伴低血钾
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心力衰竭伴心动过缓
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心力衰竭伴心房纤颤
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