一、正常心电图波形特征及生理意义正常心电图波形由一组波群组成,每一个心动周期有以下各波形(图4-1):(一)P波P波反映左右两心房的电激动过程气也叫心房除极波。其起点表示窦房结开始激动,终点 First, the normal ECG waveform characteristics and physiological significance Normal ECG waveform consists of a group of wave groups, each cardiac cycle has the following waveforms (Figure 4-1) :( a) P wave P wave reflects the left and right atrial electrical excitation process Gas is also called atrial depolarization wave. The starting point that the beginning of sinus node activation, the end