Abstract：Objective To explore the analytical skills and strategies of three-dimensional Lorenz scatter plot. Methods Mathematical model of threedimensional Lorenz scatter plot was made by using solid geometry software. Based on plane analytic geometry, spatial analytic geometry, graph theory, and permutation and combination, the spatial distribution rules of threedimensional Lorenz scatter plot were studied; its characteristics and analytical skills were summarized, in a combination with typical cases with frequent ventricular premature beats, and their bigeminy and trigeminy(DMS Company). Results The three-dimensional Lorenz scatter plots of frequent ventricular premature beats, and their bigeminy and trigeminy reflect extremely strong regularity. The xOy and yOz surfaces are equivalent of two-dimensional Lorenz scatter plots, which reflect the rules of adjacent RR intervals. The zOx surface expresses extremely strong regularity of separated RR intervals, which exhibits symmetric features. The xyz surface is similar to two-dimensional difference scatter plot, which expresses the regularity of difference of adjacent RR intervals. And the surface centered at spatial constant velocity line satisfies the law of vector conservation. Conclusion The threedimensional Lorenz scatter plot integrates all the advantages of two-dimensional Lorenz scatter plot and two-dimensional difference scatter plot. It also facilitates the research on the regularity of separated RR intervals by providing a new perspective of zOx surface. The analytical strategies of three-dimensional Lorenz scatter plot are as follows. For the xOy and yOz surfaces, three-impulseandtwo-interval point is supplemented into four-impulseandthree-interval point separately in the methods of “add cardiac impulse in back” and “add cardiac impulse in front” based on two-dimensional Lorenz scatter plot. In the zOx surface, the classification characteristics of RR intervals can be known by its symmetric features. In the xyz surface, arrhythmia events can be analyzed on the basis of vector conservation.
