心肌氯需↑武供、氣供失平衡 状动脉供血J心肌暂时缺血缺氣 decrease myocardial increase oxygen oxvgen reguirement delivery心肌氧需 血供、氧供失平衡 冠状动脉供血 心肌暂时缺血缺氧 decrease myocardial oxygen requirement increase oxygen delivery