Paperdoi:10.1088/0967-3334/36/10/2203
Estimation of instantaneous venous blood saturation using the photoplethysmograph waveform
Physiological Measurement
TL;DR
Non-invasive estimation of regional venous saturation (SxvO2) using a conventional pulse oximeter could provide a means of obtaining clinically relevant information. This study was carried out in order to investigate the hypothesis that SxvO2 could be estimated by utilising the modulations created by positive pressure ventilation in the photoplethysmograph (PPG) signals. The modulations caused by the mechanical ventilator were extracted from oesophageal PPG signals obtained from 12 patients undergoing cardiothoracic surgery.
- Published in Physiological Measurement (2015).
Abstract
Non-invasive estimation of regional venous saturation (SxvO2) using a conventional pulse oximeter could provide a means of obtaining clinically relevant information. This study was carried out in order to investigate the hypothesis that SxvO2 could be estimated by utilising the modulations created by positive pressure ventilation in the photoplethysmograph (PPG) signals. The modulations caused by the mechanical ventilator were extracted from oesophageal PPG signals obtained from 12 patients undergoing cardiothoracic surgery. The signals analysed in this work were acquired in a previous study. For the purpose of this analysis the raw PPG signal was considered to have three major components, ac PPG signal (cardiac related component), a static component or dc PPG signal (created mostly by the absorption of light by surrounding tissue) and the ventilator modulation component. These components were then used to estimate instantaneous arterial blood oxygen saturation (SpO2) and SxvO2 by utilising time-frequency analysis technique of smoothed-pseudo Wigner-Ville distribution (SPWVD). The results showed that there was no significant difference in the traditionally-derived (time-domain) arterial saturation and the instantaneous arterial saturation. However, the instantaneous venous saturation was found to be significantly lower than the estimated time-domain and instantaneous arterial saturation (P = < 0.001, n = 12).
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Cite this paper
Shafqat, K., Langford, R. M., & Kyriacou, P. A. (2015). Estimation of instantaneous venous blood saturation using the photoplethysmograph waveform. Physiological Measurement. https://doi.org/10.1088/0967-3334/36/10/2203
Shafqat, K, R M Langford, and P A Kyriacou. 2015. "Estimation of instantaneous venous blood saturation using the photoplethysmograph waveform." Physiological Measurement. https://doi.org/10.1088/0967-3334/36/10/2203.
Shafqat, K., Langford, R. M. and Kyriacou, P. A. (2015) 'Estimation of instantaneous venous blood saturation using the photoplethysmograph waveform', Physiological Measurement. doi: 10.1088/0967-3334/36/10/2203.
Shafqat, K, et al. "Estimation of instantaneous venous blood saturation using the photoplethysmograph waveform." Physiological Measurement, 2015. https://doi.org/10.1088/0967-3334/36/10/2203.
K. Shafqat, R. M. Langford, and P. A. Kyriacou, "Estimation of instantaneous venous blood saturation using the photoplethysmograph waveform," Physiological Measurement, 2015, doi: 10.1088/0967-3334/36/10/2203.
@article{shafqat2015estimation,
title = {{Estimation of instantaneous venous blood saturation using the photoplethysmograph waveform}},
author = {Shafqat, K. and Langford, R. M. and Kyriacou, P. A.},
year = {2015},
journal = {Physiological Measurement},
doi = {10.1088/0967-3334/36/10/2203}
}Added to the ChatPPG research hub
