Document Detail


Effect of probe contact pressure on the photoplethysmographic assessment of conduit artery stiffness.
MedLine Citation:
PMID:  23377011     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
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 >300  percent. In contrast, at the optimal CP, the b/a showed high repeatability (coefficient of variability <5  percent). The effect has been explained with exponential pulse pressure-volume relationship model which indicates the optimal CP range.
Authors:
Andris Grabovskis; Zbignevs Marcinkevics; Uldis Rubins; Edgars Kviesis-Kipge
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of biomedical optics     Volume:  18     ISSN:  1560-2281     ISO Abbreviation:  J Biomed Opt     Publication Date:  2013 Feb 
Date Detail:
Created Date:  2013-02-04     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9605853     Medline TA:  J Biomed Opt     Country:  United States    
Other Details:
Languages:  eng     Pagination:  27004     Citation Subset:  IM    
Affiliation:
University of Latvia, Institute of Atomic Physics and Spectroscopy, Raina Boulevard 19, Riga, LV-1586, Latvia.
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