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Beyond HRV: attractor reconstruction using the entire cardiovascular waveform data for novel feature extraction

Aston, Philip, Christie, Mark I, Huang, Ying and Nandi, Manasi (2018) Beyond HRV: attractor reconstruction using the entire cardiovascular waveform data for novel feature extraction Physiological Measurement.

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Abstract

Advances in monitoring technology allow blood pressure waveforms to be collected at sampling frequencies of 250-1000Hz for long time periods. However, much of the raw data are under analysed. Heart rate variability (HRV) methods, in which beat-to-beat interval lengths are extracted and analysed, have been extensively studied, However, this approach discards the majority of the raw data. Objective: Our aim is to detect changes in the shape of the waveform in long streams of blood pressure data. Approach: Our approach involves extracting key features from large complex datasets by generating a reconstructed attractor in a three-dimensional phase space using delay coordinates from a window of the entire raw waveform data. The naturally occurring baseline variation is removed by projecting the attractor onto a plane from which new quantitative measures are obtained. The time window is moved through the data to give a collection of signals which relate to various aspects of the waveform shape. Main results: This approach enables visualisation and quantification of changes in the waveform shape and has been applied to blood pressure data collected from conscious unrestrained mice and to human blood pressure data. The interpretation of the attractor measures is aided by the analysis of simple artificial waveforms. Significance: We have developed and analysed a new method for analysing blood pressure data that uses all of the waveform data and hence can detect changes in the waveform shape that HRV methods cannot, which is confirmed with an example, and hence our method goes "beyond HRV".

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Mathematics
Authors :
NameEmailORCID
Aston, PhilipP.Aston@surrey.ac.ukUNSPECIFIED
Christie, Mark IUNSPECIFIEDUNSPECIFIED
Huang, Yingy.h.huang@surrey.ac.ukUNSPECIFIED
Nandi, ManasiUNSPECIFIEDUNSPECIFIED
Date : 19 January 2018
Identification Number : 10.1088/1361-6579/aaa93d
Copyright Disclaimer : © 2018 Institute of Physics and Engineering in Medicine. As the Version of Record of this article is going to be/has been published on a gold open access basis under a CC BY 3.0 licence, this Accepted Manuscript is available for reuse under a CC BY 3.0 licence immediately. Although reasonable endeavours have been taken to obtain all necessary permissions from third parties to include their copyrighted content within this article, their full citation and copyright line may not be present in this Accepted Manuscript version. Before using any content from this article, please refer to the Version of Record on IOPscience once published for full citation and copyright details, as permission may be required. All third party content is fully copyright protected, and is not published on a gold open access basis under a CC BY licence, unless that is specifically stated in the figure caption in the Version of Record.
Depositing User : Clive Harris
Date Deposited : 23 Jan 2018 14:01
Last Modified : 23 Jan 2018 14:01
URI: http://epubs.surrey.ac.uk/id/eprint/845670

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