Abstract：The appearance of long period complicates the original scatter plot of arrhythmia, and the scatter point drifting method serves as a “secret weapon” to solve these cases. The long period related characteristic point set is similar to the homonymous one without long period, and the former is equivalent to a drift from the latter. The drifting law of Lorenz scatter plot is as follows: the extended front period moves to the right, the extended back period moves up, and both of the front and back period extend to the upper right. The drifting law of the difference scatter plot is as follows: the extended front period moves to the left, the extended back period moves up, and the extended middle period moves to the bottom right. Taking second degree atrioventricular block scatter plot as an example, this paper summarizes the positional relationship between long period related point set and basic point set, which is popularized to premature beat related characteristic point set. This paper aims to lay a foundation for rapid analysis of ambulatory electrocardiography by exploring the analytical skills of long period related ECG scatter plot.
