Abstract
We introduce a recently developed nonlinear-type time–frequency analysis tool, synchrosqueezing transform (SST), to quantify complicated and noisy physiological waveform that has time-varying amplitude and frequency. We apply it to analyze a peripheral venous pressure (PVP) signal recorded during a seven hours aortic valve replacement procedure. In addition to showing the captured dynamics, we also quantify how accurately we can estimate the instantaneous heart rate from the PVP signal.
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Notes
When we are concerned with the statistical properties, the stationarity is defined to have a zero mean and the covariance between any two time points only depends on the time difference. We do not pursue this kind of stationarity in this work.
The power spectrum is usually defined as the magnitude squared of the Fourier transform of a given signal. In this paper, to avoid the normalization issue, we call the magnitude of the Fourier transform of a given signal the power spectrum.
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HTW: idea, literature review, data analysis and write-up. AA: idea, literature review, data collection, and write-up. KS: idea, literature review, data collection, and write-up.
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Wu, HT., Alian, A. & Shelley, K. A new approach to complicated and noisy physiological waveforms analysis: peripheral venous pressure waveform as an example. J Clin Monit Comput 35, 637–653 (2021). https://doi.org/10.1007/s10877-020-00524-9
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DOI: https://doi.org/10.1007/s10877-020-00524-9