Research Papers: Sensing

Effect of probe contact pressure on the photoplethysmographic assessment of conduit artery stiffness

[+] Author Affiliations
Andris Grabovskis, Uldis Rubins, Edgars Kviesis-Kipge

University of Latvia, Institute of Atomic Physics and Spectroscopy, Raina Boulevard 19, Riga, LV-1586, Latvia

Zbignevs Marcinkevics

University of Latvia, Department of Human and Animal Physiology, Raina Boulevard 19, Riga, LV-1586, Latvia

J. Biomed. Opt. 18(2), 027004 (Feb 01, 2013). doi:10.1117/1.JBO.18.2.027004
History: Received October 1, 2012; Revised January 6, 2013; Accepted January 7, 2013
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Abstract.  Currently, photoplethysmography (PPG) is a frequently studied optical blood pulsation detection technique among biophotonic and biomedical researchers due to the fact that it shows high potential for estimating the arterial stiffness (AS). The extraction of diagnostically useful information requires standardized measurement procedure with good repeatability. However, the effects of a crucially important factor—the optimal contact pressure (CP) of the probe—are often ignored. Also, CP values are not reported to evaluate those effects. It is hypothesized that AS estimated from PPG pulse wave 2nd derivative parameter b/a is strongly inconsistent when recorded at nonoptimal probe CP. Our pilot study confirmed this during in vivo PPG recordings from conduit artery sites on five healthy subjects at variable probe CP (0 to 15 kPa) by using 880 nm reflectance type sensor, force transducer, and PPG alternating current (AC) signal pulse area derived optimal CP criterion. The b/a values, calculated from PPG with variable CP, showed variation >300percent. In contrast, at the optimal CP, the b/a showed high repeatability (coefficient of variability <5percent). The effect has been explained with exponential pulse pressure-volume relationship model which indicates the optimal CP range.

Figures in this Article
© 2013 Society of Photo-Optical Instrumentation Engineers

Topics

Arteries

Citation

Andris Grabovskis ; Zbignevs Marcinkevics ; Uldis Rubins and Edgars Kviesis-Kipge
"Effect of probe contact pressure on the photoplethysmographic assessment of conduit artery stiffness", J. Biomed. Opt. 18(2), 027004 (Feb 01, 2013). ; http://dx.doi.org/10.1117/1.JBO.18.2.027004


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