(Department of Electrocardiogram, 1. the 940th Hospital of Joint Logistics Support Force of Chinese Peoples Liberation Army, Lanzhou Gansu 730050; 2. the Second Affiliated Hospital of Zhengzhou University, Zhengzhou Henan 450014; 3. the Fifth Affiliated Hospital of Zhengzhou University, Zhengzhou Henan 450000, China)
Abstract：We selected patients with second degree atrioventricular block (AVB) complicating frequent premature ventricular beats and junctional premature beats. Their characteristics of ECG scatter plot were analyzed, and analysis skills were summarized. There is an analogy between the characteristic point set related to second degree AVBinduced long period and the homonymous one without long period. The former is equivalent to a drift from the latter. The drifting law of Lorenz scatter plot is as follows: the front period is extended and moves to the right, the back period is extended and moves up, and both of the front and back period extend to the upper right. The drifting law of difference scatter plot is as follows: the front period is extended and moves to the left, the back period is extended and moves up, and the middle period is extended and moves to the bottom right. The appearance of AVBinduced long period complicates the original scatter plot of arrhythmia. The scatter point drifting method serves as a “secret weapon” to identify these cases.
