Keselbrener L, Akselrod S
Abramson Center for Medical Physics, Sackler Faculty of Exact Sciences, Tel Aviv University, Israel.
Clin Auton Res. 1995 Oct;5(5):295-301. doi: 10.1007/BF01818895.
The non-invasive Finapres (finger arterial pressure) device is widely used for the measurement of arterial blood pressure (BP) in BP variability studies, in particular in experimental studies. In our work, we have noticed that the calibration pauses of the Finapres, occurring approximately every 80 heart beats, introduce artefacts in standard and time-dependent spectral analysis of the arterial BP signal. This report describes these artefacts and indicates their dependence on the heart rate (HR) of the subject. In standard spectral analysis, they appear principally for low HR subjects, whereas in time-dependent spectral analysis, they distort the time-dependent spectrum both for low and high HR subjects. A possible correction procedure is presented which eliminates these pauses, causing minimal distortion from the original arterial BP time series. This correction keeps the total time-duration of the corrected signal equal to that of the original signal, thus allowing reliable spectral analysis of arterial BP fluctuations to be performed.
无创Finapres（手指动脉压）设备广泛用于血压变异性研究，尤其是实验研究中的动脉血压（BP）测量。在我们的工作中，我们注意到Finapres大约每80次心跳出现一次的校准停顿会在动脉血压信号的标准和时变频谱分析中引入伪影。本报告描述了这些伪影，并指出了它们对受试者心率（HR）的依赖性。在标准频谱分析中，它们主要出现在心率较低的受试者中，而在时变频谱分析中，它们会使心率低和高的受试者的时变频谱都发生畸变。本文提出了一种可能的校正程序，该程序消除了这些停顿，使原始动脉血压时间序列产生的失真最小。这种校正使校正后信号的总时长与原始信号的总时长相等，从而可以对动脉血压波动进行可靠的频谱分析。
