应用Lorenz散点图确定短联律间期室早的易发部位

Application of Lorenz scatterplot in identifying the originating site of short coupling interval ventricular premature beats

目的探讨短联律间期室早的发生与心室解剖位置的相关性。方法应用Lorenz散点图找出室早点集中显示最短联律间期点,并通过逆向技术确定室早起源部位。测量401例单源性和93例多源性、不同起源点室早的最短联律间期,并进行统计学分析,确定短联律间期室早的易发部位。结果左、右室心尖部起源的室早在单源性及多源性室早中形成的联律间期均为最短,二者比较差异无统计学意义(P>0.05);与其他部位起源的短联律间期室早相比,差异均有统计学意义(P<0.05)。结论左、右心尖部起源室早形成短联律间期,可能与心尖部的结构及功能有关。同时,该部位室早是否是一些恶性室性心律失常的诱因,尚待进一步做大样本研究。

Objective To explore the correlation between short coupling interval ventricular premature beats( PVBs) and ventricular anatomical position. Methods Lorenz plot was utilized in finding the points representing the shortest coupling interval among the PVBs point set,and the originating site of PVBs was identified by reversal technique. The shortest coupling intervals of 401 cases with single-sourced PVBs and 93 cases with multifocal PVBs were measured and statistically analyzed.Based on the analysis,the regions were specified where the short coupling interval PVBs was prone to occur. Results PVBs originating at the apex of left and right ventricle had the shortest coupling intervals,whatever among single-sourced or multifocal PVBs. There was no statistically significant difference in the shortest coupling interval between left and right ventricular apex originated PVBs( P >0. 05),however,if compared with those of PVBs originating from other sites,the differences were statistically significant( P < 0. 05). Conclusion It is possibly related to the structure and function of heart apex that the shortest coupling interval is found in PVBs originating at the apex of left and right ventricle. Meanwhile,it requires further study on large sample to decide whether PVBs originating at the above sites can induce some kinds of malignant ventricular arrhythmias.