NUMERICAL METHOD FOR CALCULATING THE SEGMENTS’ WORK OF THE LEFT VENTRICLE 

Smirnov Yuriy Gennad'evich, Doctor of physical and mathematical sciences, professor, head of the sub-department of mathematics and supercomputer modeling, Penza State University (40, Krasnaya street, Penza, Russia), E-mail: mmm@pnzgu.ru
Oleynikov Valentin Elivich, Doctor of medical sciences, professor, head of the sub-department of therapeutics, Medical Institute, Penza State University (40, Krasnaya street, Penza, Russia), E-mail: v.oleynikof@gmail.com
Kupriyanova Svetlana Nikolaevna, Candidate of physical and mathematical sciences, associate professor, sub-department of mathematics and supercomputer modeling, Penza State University (40, Krasnaya street, Penza, Russia), E-mail: snkupr@yandex.ru
Galimskaya Vera Aleksandrovna, Candidate of medical sciences, associate professor, sub-department of therapeutics, Medical Institute, Penza State University (40, Krasnaya street, Penza, Russia), E-mail: Vera-budanova@mail.ru
Gundarev Evgeniy Andreevich, Postgraduate student, Penza State University (40, Krasnaya street, Penza, Russia), E-mail: psu.gun@mail.ru
Golubeva Alena Vladimirovna, Assistant, sub-department of therapeutics, Medical Institute, Penza State University (40, Krasnaya street, Penza, Russia), E-mail: Fialmy@mail.ru 

519.642 

10.21685/2072-3040-2020-1-2 

Background. Estimation of the work of each segment of the left ventricle (LV) characterizes the effectiveness of myocardial contraction and the actual cardiac output of the LV. The aim of this study is to develop and justify new indicators based on longitudinal, radial and circular deformations obtained using 3D speckles echocardiography.
Materials and methods. Segmented data was obtained using an ultrasound machine «VividTM E95» in 2D- and 3D-modes. To calculate the operation of individual LV segments, a numerical method is implemented.
Results. In this paper, studied the relationship between the deformation characteristics of the left ventricle and its volumetric indices. The obtained performance indicators can more accurately reflect LV systolic function.
Conclusion. The proposed indicators of the effectiveness of the LV provide a more accurate assessment of the state of the myocardium. The mathematical apparatus opens up unique opportunities for further study of the contractile function of the myocardium. 

segmental longitudinal strain, segmental circumferential strain, segmental radial strain, myocardial function, 3D speckle echocardiography 

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