While vasoreactivity of an individual blood vessel is quite well studied, much less in known about stimulustriggered behavior of microcirculatory networks in situ . the available experimental data on topic suggest that the response pattern of the network, being the coordinated change of flow through the group of vessel, asa well as adjusment of their diameters, ofthen can be found inconsistent with what is expected from ”system of elastic tubes”. Physiologically, this is because of autoregulation of vascular tone by means of number of pathways, mediated by cells that form two main cellular layers - the endothelial cells and the vascular smooth muscle cells. Since it is still not easy to measure simulteneously bothe the flow/ diameter and the degree of activation of smooth muscle cells, the mathematical modeling study on topic is very suitable. In this work we present the results of modeling study performed on the set of 20 different variants of 14-vessels vascular tree. Our results show three distinctive stages of vascular response to the abrupt change of conditions (occlusion of one of vessels).
Despite the variety of existing methods of recording the human pulse and a solid history of their development, there is still considerable interest in this topic. The development of new non-contact methods, based on advanced image processing, caused a new wave of interest in this issue. We present a simple but quite effective method for analyzing the mechanical pulsations of blood vessels lying close to the surface of the skin. Our technique is a modification of imaging (or remote) photoplethysmography (i-PPG). We supplemented this method with the addition of a laser light source, which made it possible to use other methods of searching for the proposed pulsation zone. During the testing of the method, several series of experiments were carried out with both artificial oscillating objects as well as with the target signal source (human wrist). The obtained results show that our method allows correct interpretation of complex data. To summarize, we proposed and tested an alternative method for the search and analysis of pulsating vessels.
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