心脏是个动力系统,它能作功推动血液不断循环流动。同时它也是个发电器官,产生电场及微弱电流。这个电场分布在身体各部分,通过体液反映到体表上来。用心电图机在体表不同部位记录心电位变化的波形称为心电图。探测电极之间或探测电极与心电偶零电位点之间的联线,就称为该心电图的导联轴。心脏在电激动过程中的任一瞬间,电激动过程可以用一个等效心电偶或心电偶矩矢量表示。现代理论认为,从定性方面说每一导联心电图,只不过是心跳一周期内变化的心电向量 The heart is a dynamic system that works to promote continuous circulation of blood. At the same time it is also a power generating organ, producing electric fields and weak currents. This electric field is distributed in various parts of the body and reflected on body surface through body fluids. Electrocardiograph with different parts of the body surface recorded changes in cardiac potential waveform called ECG. Detection of the electrode or between the detection electrode and the ECG even point between the potential line, it is called the lead axis of the ECG. At any moment during the heart’s electrical activation, the electrical activation process can be represented by an equivalent galvanic couple or cardiometrical couple moment vector. Modern theory that, from a qualitative point of view each lead ECG, heart rate is only one cycle of changes in ECG vector