Abstract
A non-invasive technique is implemented to measure a peripheral vascular compliance index Cindex, using an infrared photoplethysmographic waveform as an indicator of intravascular volume change and a continuous blood pressure monitor to measure the blood pressure during each heart-beat. The non-linear behaviour of Cindex with pressure and the effect of age on Cindex are studied in 62 males (15–73 years). Repeatability tests and the effect of ice-water exposure of a portion of a limb are studied in 10 and 14 subjects, respectively. For each individual, Cindex measurements are taken at discrete values of local mean arterial pressure (Pmean), and a Cindex against Pmean plot is obtained. There is a statistically significant difference (p<0.05) in Cindex for the lower values of Pmean (60–100 mmHg) between two age groups formed (15–52 and 58–73 years). The cold-pressor test (CPT) shows a 68% median decrease in Cindex, with an inter-quartile range of 60–77%, in a matter of seconds. The results suggest that Cindex may be a useful noninvasive indicator of peripheral vascular compliance in humans.
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López-Beltrán, E.A., Blackshear, P.L., Finkelstein, S.M. et al. Non-invasive studies of peripheral vascular compliance using a non-occluding photoplethysmographic method. Med. Biol. Eng. Comput. 36, 748–753 (1998). https://doi.org/10.1007/BF02518879
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DOI: https://doi.org/10.1007/BF02518879