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COMPARISON OF THE MANUFACTURER'S TECHNICAL SPECIFICATIONS WITH POSTOPERATIVE RESULTS IN FOUR TYPES OF STENTED BIOPROSTHESES IN THE AORTIC POSITION

The problem of the best bioprosthesis type for aortic valve substitute is unresolved. We used bioprostheses from four manufacturers for patients in older age group. The aim of the study was to analyze technical characteristics of the valves, compare hemodynamics between four valve types in 21, 23, 25 sizes in our and literature data. The research was retrospective and unrandomised. During the period 1.01.2007–1.06.2018 in the district of cardiosurgery of Belgorod regional Hospital 169 bioprostheses were implanted in aortic position. 21 mm size valves were used in 74 cases, 23 mm size in 66 cases, 25 mm in 29 cases. Stented bioprostheses of four manufacturers were used: Carpentier-Edwards PERIMOUNT (Edwards, USA), Aspire (Vascutek, USA), Hancock-2 (Medtroniс, USA), UniLine (NeoCor, Russia). Technical characteristics of the valves were obtained from official sources of manufacturers. The evaluated parameter were: peak and mean gradient, stroke volume. Comparison of three hemodynamic parameters in early postoperative period revealed best hydrodynamic results with UniLine (NeoCor) valve. The Hancock-2 stented valve conceded all other prostheses. According to technical characteristics: internal diameter, external diameter and their interrelationship the best was the UniLine (NeoCor) valve. Among the four investigated valves the UniLine (NeoCor) valve showed most effective hemodynamics and morphometry. Thus it proposes better systolic and diastolic left ventricle function, more complete hypertrophy regress. In combination with flexible stent this valve is preferable for surgical implantation.

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