人体心脏脉动的混沌动力学研究

Study on chaotic dynamics of human heart beats

目的和方法采用混沌动力学方法，对冠心病３０例和正常对照组３０例的心率时间序列功率谱和关联维数等三个方面作了对比研究。结果心脏健康者的心率变化表现出明显的游走性，其功率谱和相空间吸引子明显呈现混沌特性，奇怪吸引子呈现复杂结构，关联维数Ｄｎ＞４。而心脏病患者的心率呈现出明显的周期性，其功率谱主要集中在０～０．１Ｈｚ的窄带范围，相空间轨迹不存在饱和的关联维数。结论上述结果为分析心率变化提供了反映动力学特性的量化指标。心脏病患者与正常人的心率变化特征有本质区别。

Objective and methods Dynamic characters of heart beats for 30 healthy persons and 30 patients with heart disease were studied by using the method of chaotic dynamics,three contrasted analysis methods were timeserial, power spectra and correlative fractral dimension. ResultsTSSHealthy heart beats appear random; heart beats' power-spectra and strange attractors in phasespace had chaotic characters very clearly , strange attractors appear complicated structure ( correlative fractral dimension Dn>4).On the contrary, heart beats of patients with heart disease had clear periodicity, its power spectra mainly concentrate on a narrow range with 00.1Hz.The orbit of phase space had not saturated dimension. Conclusion Dynamic characters of heart beats between healthy persons and patients with heart disease have an essential distinction.