A.W.M. Ahmed - Post-graduate Student, Department of Biomedical and Electronic Systems and Technology, Vladimir State University. E-mail: walid_aed@mail.ru R.V. Isakov - Ph.D. (Eng.), Associate Professor, Department of Biomedical and Electronic Systems and Technology, Vladimir State University. E-mail: Isakov-RV@mail.ru L.T. Sushkova - Dr.Sc. (Eng.), Professor, Head of Department of Biomedical and Electronic Systems and Technology, Vladimir State University. E-mail: ludm@vlsu.ru

The functional condition of the cardiovascular system (CVS) is studied using complex instrumental methods to objectively evaluate the biophysical processes in the circulatory system (electrical and mechanical activity of the heart, intracardiac and hemodynamics) [1]. Among them, the most common method is electrocardiography, which allows to evaluate the functioning of the heart using an electrocardiogram (ECG). In this regard, a good addition to electrocardiography is phonocardiograph (PCG), allowing investigating and detecting the presence of disorders of the heart and valve apparatus. The method is based on recording and analyzing sounds produced during contraction and relaxation of the heart, including - heart murmur, which are known to be the first sign occurring disorders of the heart. The source of diagnostic information here is called phonocardiography. The advantages of the phonocardiography are [50]: a) The exclusion of subjectivity in the interpretation of heart sounds and heart murmurs; b) The possibility of registration of the heart sounds and noises in conjunction with electrical and mechanical phenomena that occur during the cardiac cycle. Analysis of the literature shows that the scientific and practical interest in the processing and analysis of the PCG in terms of its research in the diagnostics cardiovascular system is constantly growing, as evidenced by numerous scientific papers. One of the stages of processing PCG is its segmentation, providing high information content and accuracy of diagnostic information about the CVS. In this paper the task of comparing analysis of existing methods of segmentation of the main components of phonocardiogram (PCG) in terms of fulfillment of the tasks. Methods of segmentation must ensure reliable efficiency of localization of heart sound S1 and S2 in phonocardiogram. Reviewed examples of practical applications of known segmentation methods from domestic and foreign sources. On the basis of the conducted analysis demonstrated that in solving the problem of segmentation PCG should be prefer such method, which does not require the use of additional biosignals and priori information about any relationships in the original signal. The results of the analysis of the most frequently used methods of segmentation PCG allows to eliminate weaknesses in the known methods for improving the processing systems of the PCG.

 

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