ASSESSMENT OF HEART RATE VARIABILITY IN PATIENT UNDERGOING VASCULAR SURGERY

这项研究的目的是检验同时分析非线性和线性测量是否揭示了血管手术患者围手术期心率变异性(HRV)的不同特征。心率变异性的低频、高频和总功率在术后第7天均低于对照组。非线性测量改变了术后即刻的时间，一周内恢复到对照水平。同时对HRV的非线性和线性测量进行分析，揭示了大血管手术后动态心血管稳态和自主神经系统状态的不同变化模式。通过量纲分析，我们发现，仅在术后即刻，HRV中维度的嵌入和相关性都有显著的降低。然而，在大血管手术后，RR方差和HRV频谱功率的所有分量的减少对一个弱者持续存在。量纲分析揭示了大血管手术后HRV改变的几个不同的亚类，它们可能对应于简单统计分析无法区分的不同生理状态，或者HRV时间序列的功率谱，HRV的非线性和线性测量不能被认为是大血管手术后的等价测量。

The aim of this study was to examine whether simultaneous analysis of nonlinear and linear measures revealed different characteristics of heart rate variability (HRV) during perioperative period in patients undergoing vascular surgery. Low frequency, high frequency and total power of heart rate variability were decreased until 7th postoperative day as compared to control. The nonlinear measures changed immediate postoperative period, returning to control level within one week. Simultaneous analysis of nonlinear and linear measures of HRV revealed different patterns of alterations in status of dynamic cardiovascular homeostasis and autonomic nervous system after major vascular surgery. Using dimensional analysis, we heve shown that significant reduction occurred both the embedding and correlation of dimensions in HRV only during immediate postoperative period. Whereas, decreases in RR variance and all components of the spectral power of HRV persisted for one weak after major vascular surgery. Dimensional analysis revealed several distinct subcategories of patterns of alterations in HRV after major vascular surgery, which may correspond to different physiologic atates that are indistinguishable by simple atatistical analyzes, or the power spectrum of the time series of HRV.Non-linear and linear measures of HRV cannot be considered equivalent measures after major vascular surgery.