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This article presents an analysis of the impact of the transcatheter prosthesis frame design features on the results of its implantation in the aortic root model. In this paper we analyzed the various approaches to the design of such structures, as well as modifications in order to improve their functional characteristics during the implantation. As a general method for obtaining the results of interaction of the objects was used finite element method with nonlinear materials description and analysis of the main parameters: the stress-strain state, radial and friction forces.

This paper presents the analysis of dependences between frame basic cell geometry parameters and function via finite element analysis. The simplified models of frame cell with varied strut width, thickness and quantity in a circle was researched to evaluate radial forces, maximum stress and strain, permanent residual strain and pinching load forces. The outcomes of this study might help in the development of new artificial heart valves and during the analysis of existing in-clinical TAVI prostheses.

Aim. To study different ways of development and combinational abilities of pathological changes common for bicuspid aortic valvulopathy. Material and methods. Totally 207 patients included, who had during previous 5 years been operated for progression of inherited aortic valve defect. The age varied from 17 to 75 years (median 49,6±0,9 y.), men to women — 3:1. Comorbidities included rheumatic fever in 33 (15,9%) patients and infectious endocarditis in the past in 45 (21,7%). In 111 (53,6%) patients aortic stenosis dominated and distension of ascending aorta — in 82 (39,6%) patients.Results. For most of patients mechanical prostheses were used and only for 12 — biological; 13 patients underwent valvulopastic or no any operation. One third of patients (31,9%) required a prosthesis of ascending aorta. Combinations of additional procedures (as aortic valve plastic or prosthesis, tricuspid plastic, left atrium plastic, septal defects sewing, coronary bypass grafting) were not unusual — in 57. In-hospital mortality reached 2,9%.Conclusion. Bicuspid aortic valve is a specific kind of valvulopathy, commonly combined with aortopathy. The development of this pathology is probably inherited. Clinical picture of the defect develops during time and its exacerbation might be accelerated by rheumathic fever and infectious endocarditis. Surgical treatment is effective.