Human Vascular System Screening System Using a Relative Description Photoplethysmograms

Screening studies play an important role in the prevention of chronic diseases of the cardiovascular system. One of the methods of screening vascular diagnostics is the method of photoplethysmography, which is widely used to assess the state of the cardiovascular system. To increase the efficiency of screening studies, it is proposed to use an algorithm for automated processing of photoplethysmograms, which is based on a relative description of the shape of the pulse curve, represented as a lattice function of the digital signal of the photoplethysmogram. The advantages of the relative description of the digital representation of a photoplethysmogram is its invariance to linear transformations of the signal amplitude and its time shift. This is important when analyzing pulse curves due to the possibility of changing the amplitude parameters of the curve, as well as their time shift during their registration. In this case, the analysis of changes in the shape of the photoplethysmogram is carried out after it is presented as a matrix of the ratio of the order of the components of the lattice function, representing the digital representation of the photoplethysmogram after the analog-to-digital conversion of the analog representation of the photoplethysmogram. During screening studies, changes in the shape of the photoplethysmogram are detected by comparing it with the standard of the ratio matrix. The ratio matrix is derived from the grid function of the digital representation of a typical photoplethysmogram of a patient. Such a photoplethysmogram characterizes a certain disease of the cardiovascular system. As a result of comparing the ratio matrices, the proximity of the features of the typical form of the photoplethysmogram to the photoplethysmogram standards is determined, after which the diagnosis of the disease is established. To implement the proposed research algorithm, a block diagram of an automated system for screening the cardiovascular system is provided. In this scheme, a homomorphic relative description is used to represent the photoplethysmogram digitally. This makes it possible to identify individual changes in the shape of the photoplethysmogram associated with abnormalities in the state of the cardiovascular system. This approach expands the arsenal of technical tools used in screening the cardiovascular system.

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