24小时心率波动的时频分析用于表征极低频成分

Proceedings of 16th Annual International Conference of the IEEE Engineering in Medicine and Biology Society Pub Date : 1994-12-01 DOI:10.1109/IEMBS.1994.415417

H. Chan, Jiunn-Lee Lin, C. Du, Chien-Ping Wu

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引用次数: 0

摘要

采用平滑伪Wigner-Ville分布研究24小时心率波动的极低频分量(小于0.04 Hz)的时间和频率特征。在一些心力衰竭的病例中，作者可以看到与Cheyne-Stokes呼吸有关的Wigner-Ville分布的显著和非常低的频率振荡。而正常受试者的Wigner-Ville分布没有这种振荡，而是更随机的谱特征。此外，作者计算了平均谱的1/f/sup /spl α //回归斜率作为分形维数的粗略估计。心力衰竭患者的斜率比正常人更负(-1.866/spl plusmn/0.888 vs -0.957/spl plusmn/0.180 p<0.005)，这与心力衰竭患者心率波动维度的丧失有关。

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Time-frequency analysis of 24-hour heart rate fluctuation for the characterization of very low-frequency component

A smooth pseudo Wigner-Ville distribution was employed to investigate both time and frequency characteristics in a very low-frequency component (less than 0.04 Hz) of 24-hour heart rate fluctuation. In some cases of heart failure the authors could see remarkable and very low-frequency oscillations of the Wigner-Ville distribution, which are related to Cheyne-Stokes respiration. However the Wigner-Ville distribution of normal subjects did not have such oscillations, but more random spectral characteristics instead. Furthermore, the authors calculated 1/f/sup /spl alpha// regression slopes of average spectrum to be a crude estimate of fractal dimensions. The slopes are more negative in heart failure patients than normals (-1.866/spl plusmn/0.888 vs. -0.957/spl plusmn/0.180 p<0.005), which associates a loss of dimensionality of heart rate fluctuation in heart failure.

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Proceedings of 16th Annual International Conference of the IEEE Engineering in Medicine and Biology Society

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