缺血预适应现象是心肌的一种强大的内源性保护机制，该现象已在多种动物模型得到证实。缺血预适应的保护作用表现为延缓心肌细胞坏死、缩小梗塞面积、减轻收缩功能的损伤、减少缺血／再灌注心律失常。人类心肌是否存在缺血预适应为目前研究的热点，研究者对离体心肌、ＰＴＣＡ及心脏手术中的心肌进行了大量研究，多数结果证明人类心肌确实存在预适应现象。这是进一步探讨用合适、安全的方式诱导心肌产生预适应的基础 Ischemic preconditioning is a powerful endogenous protective mechanism of myocardium that has been demonstrated in a variety of animal models. The protective effect of ischemic preconditioning is to delay myocardial necrosis, reduce the infarct size, reduce the damage of systolic function and reduce the ischemia / reperfusion arrhythmia. The preconditioning of ischemic preconditioning in human myocardium is a hot topic nowadays. Researchers have done a lot of researches on isolated myocardium, PTCA and myocardial in cardiac surgery. Most results prove that preconditioning exists in human myocardium. This is the basis for further exploring the induction of myocardial preconditioning in an appropriate and safe manner