【单选题】【消耗次数：1】
具有钾通道开放作用，可用于心绞痛治疗的药物是（）。
①
地尔硫
②
维拉帕米
③
普萘洛尔
④
氯沙坦
⑤
尼可地尔
参考答案：
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普萘洛尔治疗心绞痛时，下面描述错误的是
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阻断β受体，抑制心脏，降低心肌耗氧量
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增大心室容积，延长射血时间，能相对增加心肌耗氧量
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抑制心肌收缩力，减小心室容积，缩短射血时间，降低心肌耗氧量
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阻断心脏β受体，降低窦房结、房室结的自律性
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大剂量或高浓度是可抑制窦房结及浦氏纤维的传导
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治疗量时可产生膜稳定作用，延长APD和ERP
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