l心脏收缩前一瞬间(主动脉开放时),球囊放气,降低主动脉内舒张末压,减少左心室做功,降低后负荷,减少心肌耗氧。l心脏舒张前一瞬间(主动脉关闭时),球囊充气,增加舒张期冠脉灌注压力,增加心肌供氧。A20写在最后写在最后成功的基础在于好的学习习惯成功的基础在于好的学习习惯The foundation of success lies in good habits谢谢聆听 学习就是为了达到一定目的而努力去干,是为一个目标去战胜各种困难的过程,这个过程会充满压力、痛苦和挫折Learning Is To Achieve A Certain Goal And Work Hard,Is A Process To Overcome Various Difficulties For A Goal