通常认为,心脏的电活动发生在机械收缩之前,称为兴奋收缩耦联。心肌组织或心肌细胞电活动的发生时间、起源部位及传导路径决定了其后心脏的机械活动。但在连续的心动周期中,机械性收缩也对下一次电活动有充分的影响,称为机械电反馈,晚近 It is generally believed that electrical activity of the heart occurs prior to mechanical contraction, known as excitation-contraction coupling. Myocardial tissue or cardiomyocyte electrical activity occurs at the time, the origin and conduction path determines the subsequent heart mechanical activity. However, in a continuous cardiac cycle, mechanical contraction also has a sufficient effect on the next electrical activity, known as mechanical and electrical feedback, late