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

摘要: Currently, photoplethysmography (PPG) is a frequently studied optical blood pulsation detection tech- nique among biophotonic and biomedical researchers due to the fact that it shows high potential for estimating arterial stiffness (AS). The extraction of diagnostically useful information requires standardized measurement pro- cedure with good repeatability. However, effects crucially important factor—the optimal contact pressure (CP) probe—are often ignored. Also, CP values are not reported evaluate those effects. It hypothesized AS estimated from PPG pulse wave 2nd derivative parameter b∕a strongly inconsistent when recorded at nonoptimal probe CP. Our pilot study confirmed this during in vivo recordings conduit artery sites on five healthy subjects variable (0 15 kPa) by using 880 nm reflectance type sensor, force transducer, alternating current (AC) signal area derived criterion. values, calculated CP, showed variation >300 percent. In contrast, repeatability (coefficient variability <5 percent). effect has been explained exponential pressure-volume rela- tionship model which indicates range.©2013 Society ofPhoto-OpticalInstrumentation Engineers (SPIE)(DOI:10.1117/1