Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Speckle Plethysmography and Photoplethysmography behaviour during Cold Pressor Test

Jorge Herranz Olazabal
* ,
Ilde Lorato
ORCID logo ,
Jesse Kling
,
Marc Verhoeven
,
Fokko Wieringa
ORCID logo ,
Chris Van Hoof
,
Willem Verkruijsse
ORCID logo ,
Evelien Hermeling
Version 1 : Received: 1 May 2023 / Approved: 2 May 2023 / Online: 2 May 2023 (08:25:05 CEST)

A peer-reviewed article of this Preprint also exists.

Herranz Olazabal, J.; Lorato, I.; Kling, J.; Verhoeven, M.; Wieringa, F.; Van Hoof, C.; Verkruijsse, W.; Hermeling, E. Comparison between Speckle Plethysmography and Photoplethysmography during Cold Pressor Test Referenced to Finger Arterial Pressure. Sensors 2023, 23, 5016. Herranz Olazabal, J.; Lorato, I.; Kling, J.; Verhoeven, M.; Wieringa, F.; Van Hoof, C.; Verkruijsse, W.; Hermeling, E. Comparison between Speckle Plethysmography and Photoplethysmography during Cold Pressor Test Referenced to Finger Arterial Pressure. Sensors 2023, 23, 5016.

Abstract

Speckle Plethysmography (SPG) and Photoplethysmography (PPG) are different biophotonics technologies that allow for measurement of hemodynamics. As the difference between SPG and PPG under low perfusion conditions is not fully understood, a Cold Pressor Test (CPT) was used to modulate blood pressure and peripheral circulation. A custom-built setup simultaneously derived SPG and PPG from the same video streams at two wavelengths (639 nm and 850 nm). SPG and PPG were measured at right index finger location before and during CPT using finger Arterial Pressure (fiAP) as reference. The effect of CPT on Alternating Component amplitude (AC) and Signal-to-Noise-Ratio (SNR) of dual-wavelength SPG and PPG signals was analysed across participants. Furthermore, waveform differences between SPG, PPG, and fiAP based on frequency harmonic ratios, were analysed for each subject (n=10). Both PPG and SPG at 850 nm show a significant reduction during CPT for both AC and SNR. However, SPG showed significantly higher and more stable SNR than PPG in both study phases. Harmonic ratios were found substantially higher in SPG than PPG. Therefore, in low perfusion conditions, SPG seems to offer a more robust pulse wave monitoring with higher harmonic ratios than PPG.

Keywords

speckle contrast; optical monitoring; laser speckle; SPG; PPG; CPT; hypoperfusion

Subject

Engineering, Bioengineering

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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