DETERMINATION OF ARTERIAL VASCULAR RESISTANCE BY THE SLOPE ANGLE OF PHOTOPLETHYSMOGRAMS

Abstract

The results of an analysis of the pulse wave shape in the diastolic section of a photoplethysmogram obtained from the distal phalanx of the middle finger when its position changes are presented. A method for analyzing the shape of a pulse wave based on the maximum slope angle of a dicrotic wave section is proposed. A functional test associated with raising or lowering a limb leads to a change in pressure in the arterial part of the vascular system, causing a change in its resistance. We have provided a justification for the possibility of estimating changes in vascular system resistivity by the curvature of the dicrotic wave when changing the position of the arm, which can be measured by changing the slope angle of the photoplethysmographic signal in this area. Our proposed approach to explaining the formation of a dicrotic wave corresponds to the established patterns associated with changes in the tone of the smooth muscles of the arterioles forming the reverse blood flow and, consequently, with changes in vascular resistance. An increase in the curvature of the photoplethysmogram at the section of the dicrotic wave indicates an increase in the resistance of the arterioles.
Keywords: pulse wave shape, photoplethysmogram, diastolic wave, dicrotic wave, vascular resistance, smooth muscle tone.

Speaker

Dmitriy G. Verkhov
Saratov State University
Russia

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