BACKGROUND:In recent years the WTMM (wavelet transform modulus maxima) and MDFA (multifractal detrended fluctuation analysis) methods have become widely used techniques for the determination of nonlinear, multifractal heart rate (HR) dynamics. The purpose of our study was to compare multifractal parameters of heart rate calculated using both methods in a group of 90 patients with reduced left ventricular systolic function (rlvs group) and in a group of 39 healthy persons (nsr group). METHODS:For each subject from the rlvs group (LVEF < or =40%) and the nsr group, a 24-hour ECG Holter monitoring was performed. The width of the multifractal spectrum and global Hurst exponent were calculated by means of WTMM and MDFA methods for 5-hour daytime and nighttime subsets. RESULTS:The width of the multifractal spectrum was significantly lower and the Hurst exponent was significantly higher in rlvs group in comparison to nsr group both during diurnal activity and nocturnal rest according to MDFA and only during diurnal activity according to WTMM method. In both groups we observed significant differences of the multifractal spectrum width and the global Hurst exponent between the nighttime and daytime recordings. CONCLUSIONS:MDFA seems to be more sensitive as compared with WTMM method in differentiation between multifractal properties of the heart rate in healthy subjects and patients with left ventricular systolic dysfunction.

译文

背景:近年来,WTMM(小波变换模极大值)和MDFA(多重分形趋势波动分析)方法已成为广泛用于确定非线性,多重分形心率(HR)动力学的技术。我们研究的目的是比较90例左室收缩功能降低的患者(rlvs组)和39例健康人的组(nsr组)使用两种方法计算的心率的多重分形参数。
方法:对来自rlvs组(LVEF <或= 40%)和nsr组的每位受试者进行24小时ECG动态心电图监测。利用WTMM和MDFA方法,针对5小时的白天和夜间子集,计算了多重分形谱的宽度和整体赫斯特指数。
结果:根据MDFA,rlvs组的昼夜活动和夜间休息时,多重分形谱的宽度明显小于nsr组,Hurst指数显着较高;仅根据WTMM方法,在昼间活动时,多重分形谱的宽度较nsr组高。在两组中,我们观察到夜间和白天记录之间的多重分形谱宽度和全局赫斯特指数存在显着差异。
结论:与WTMM方法相比,MDFA在区分健康受试者和左室收缩功能不全患者的心率的多重分形特性方面似乎更为敏感。

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