Optical multichannel sensing of skin blood pulsations

Spīgulis, Jānis; Erts, Renārs; Kukulis, I.; Ozols, Māris; Prieditis, Karlis

doi:10.1117/12.566082

Cited by 2 publications

(5 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Regarding the bilateral PPG studies in the cases of one-side vascular pathologies, there are only few qualitative observations of pulse shape deformations and temporal delays (Allen and Murray 2000, Spigulis et al 2004, Spigulis 2005. To the authors' knowledge, no systematic quantitative investigations of these features in larger patient groups have been reported so far.…”

Section: Introductionmentioning

confidence: 99%

“…Blood pumping and transport can be monitored at different body locationsfingertips, earlobes, forearms, forehead, etc-with relatively simple and convenient PPG contact probes. In addition to the classical single-probe technique (Hertzman 1937), several multi-channel PPG systems providing data flow from several body sites simultaneously have been developed and clinically tested over the recent years (Allen and Murray 2000, 2003, Nitzan et al 2002, Spigulis et al 2004, Spigulis 2005. The potential of the multi-channel PPG technique for clinical sensing and monitoring seems quite promising, especially regarding early detection and express-assessment of cardio-vascular pathologies (Spigulis et al 2004, Spigulis 2005.…”

Section: Introductionmentioning

confidence: 99%

“…In addition to the classical single-probe technique (Hertzman 1937), several multi-channel PPG systems providing data flow from several body sites simultaneously have been developed and clinically tested over the recent years (Allen and Murray 2000, 2003, Nitzan et al 2002, Spigulis et al 2004, Spigulis 2005. The potential of the multi-channel PPG technique for clinical sensing and monitoring seems quite promising, especially regarding early detection and express-assessment of cardio-vascular pathologies (Spigulis et al 2004, Spigulis 2005. Direct measurements of the heartbeat pulse wave transit time (PWTT) offered by the multi-channel PPG technique (Nitzan et al 2002, Allen and Murray 2002, Spigulis et al 2004, Spigulis 2005) make it possible to estimate the arterial compliance, a physiologically significant parameter.…”

Section: Introductionmentioning

confidence: 99%

“…The potential of the multi-channel PPG technique for clinical sensing and monitoring seems quite promising, especially regarding early detection and express-assessment of cardio-vascular pathologies (Spigulis et al 2004, Spigulis 2005. Direct measurements of the heartbeat pulse wave transit time (PWTT) offered by the multi-channel PPG technique (Nitzan et al 2002, Allen and Murray 2002, Spigulis et al 2004, Spigulis 2005) make it possible to estimate the arterial compliance, a physiologically significant parameter.…”

Section: Introductionmentioning

confidence: 99%

“…The present work is aimed at filling this gap with respect to patients having arterial stenosis in a leg. Using the originally developed four-channel PPG technology (Spigulis et al 2004), bilateral measurements were taken in representative groups of leg stenosis patients and healthy volunteers.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Bilateral photoplethysmography studies of the leg arterial stenosis

et al. 2005

Self Cite

View full text Add to dashboard Cite

A newly developed portable multi-channel photoplethysmography (PPG) device has been used for comparative studies of 20 healthy control subjects and 45 patients with diagnosed arterial stenosis in a leg. The peripheral blood pulsations were detected simultaneously at four body sites-the same fingers and toes of both arms and legs. The PPG pulses recorded at the periphery of the stenotic leg, if compared with those of the healthy leg, were much weaker, with delayed arrival as a consequence of increased pulse wave transit time (PWTT) due to higher vascular resistance. The specific PWTT delays for the occluded legs were in the range of 20-80 ms, while in the case of healthy subjects the leg PPG signals arrived without delays or with smaller time-shifts not exceeding 14 ms. The reference bilateral PPG signals detected at the fingertips did not show any notable PWTT delays in both groups. Parallel measurements of local blood pressures by means of the oscillometry method with subsequent calculation of the ankle-brachial index were performed. Convincing correlation between the bilateral differences in the local blood pressure (a routine tool for diagnostics of leg stenosis) and in the corresponding PWTT delay (Pearson's coefficient r = 0.93), as well as between the PWTT delay and the ankle-brachial index (r = -0.96) has been established. From the point of view of PWTT delay, the average value of leg stenosis diagnostic threshold was established to be in the range of 23 +/- 9 ms, with full reliability above 32 ms. The obtained data may find further applications in alternative methodologies for detection and/or assessment of arterial occlusions in human extremities.

show abstract

Section: Introductionmentioning

confidence: 99%