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心率变异(HRV)可无创伤地、灵敏地反映心脏自主神经状况;交感活动加强,HRV减小;副交感活动加强,HRV增大。研究表明,由自主神经调控的HRV呈非线性变化过程。以往多采用RR间期的标准差、直方图以及功率谱描述,可总体评价HRV,但掩盖了瞬时每搏心率的变化,需以非线性方法进行分析,此方面报道尚属少见。我们利用Lorenz散点图(以前一RR间期作横坐标,以后一RR间期作纵坐标,绘得散点
Heart rate variability (HRV) can be noninvasively and sensitively reflect the autonomic status of the heart; sympathetic activity increased, HRV decreased; parasympathetic activity increased, HRV increased. Studies have shown that HRV regulated by autonomic nerve is a nonlinear process. In the past, the use of RR interval standard deviation, histogram and power spectrum description, can be an overall evaluation of HRV, but to cover the instantaneous heart rate changes, need to be non-linear method of analysis, this report is still rare. We use the Lorenz scatter plot (the previous RR interval for abscissa and the RR interval for ordinate, plotting scatter points