Download Stentless Bioprostheses by Tirone E David, Hans A Huysmans, Stephen Westaby PDF

By Tirone E David, Hans A Huysmans, Stephen Westaby

This article is split into seven sections protecting the purposes, makes use of, results and designs of stentless bioprostheses. the 3 establishing chapters describe the paediatric functions of stentless bioprostheses, almost about aortic valve alternative and correct ventricular outflow tract reconstruction Chapters within the moment part speak about using stentless bioprostheses within the mitral place. the subsequent sections speak about diversified features of the scientific results of stentless bioprostheses and the 5th part has seven chapters on haemodynamics and left ventricular functionality. the ultimate sections conceal the subjects of implantation concepts and the layout and building of stentless bioprostheses. the second one variation is up to date and greater and is Illustrated in complete color.

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All xenograft explants showed severe gross cuspal pathology with large, smooth, and thick immobilizing nodular structures representing the remnants of former cusps. 2). The tubular portion of the xenograft felt calcified in most explants and showed a smooth and shiny inner surface in all. Death and severe heart failure were apparently valve related in all 14 animals. 2 Macroscopic photograph of explanted xenograft showing the typical deformations of the valve as found in most animals. 3 Hematoxylin- and eosinstained section showing the prosthetic Stenless bioprostheses 16 wall (left) and the severely malformed valve (right) with large areas of collagen and fibrin.

At each of these load steps, both leaflet stress and coaptation were recorded. For stress results, the maximum principal stresses in the leaflets were plotted as colour contours superimposed on the deformed valve. From these plots, locations and values of stress concentrations and peak stress areas were identified. The extent and symmetry of coaptation was also observed in these plots. Finally, axial stresses in the chordae were examined. 2). Even at this early stage, the posterior leaflet was beginning to undergo compression, and the distribution of these stresses was slightly asymmetrical.

Hazekamp M G, Goffin Y A, Huysmans H A 1993 The value of the stentless biovalve prosthesis. An experimental study. Eur J Cardiothorac Surg 7:514–519 Stenless bioprostheses 18 5. Bisset G S, Schwartz D C, Benzing G, Helmsworth J A, Schreiber J T, Kaplan S 1981 Late results of reconstruction of right ventricular outflow tract with porcine xenografts in children. Ann Thorac Surg 31:437–443 6. Ebert P A 1984 Current techniques and results in infancy. In: Moulton A L (ed) Congenital heart surgery. Current techniques and controversies.

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