Results 151 to 160 of about 1,453,502 (192)
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The Pathology of Bioprosthetic Heart Valves and Allografts
1994Valve surgery continues to be a challenging aspect of current cardiac surgical practice, where each year some 30 000 patients in the United States (Miller et al. 1987) present for what might appear to be an easy procedure: the replacement of a heart valve.
H H, Scheld, W, Konertz
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A Non-Invasive Material Characterization Framework for Bioprosthetic Heart Valves
Annals of Biomedical Engineering, 2018 Computational modeling and simulation has become more common in design and development of bioprosthetic heart valves. To have a reliable computational model, considering accurate mechanical properties of biological soft tissue is one of the most ...
Danny Dvir +2 more
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Flexible Bioprosthetic Pericardial Heart Valve
The Thoracic and Cardiovascular Surgeon, 1980A flexible bioprosthetic pericardial heart valve has been produced as a consequence of adverse long-term clinical information about tissue heart valves on rigid frames. The concept of flexibility has been supported by a comparison between homograft valves on rigid and flexible supports used in the mitral position. Principles and methods of construction
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Quantitative Histological Examination of Bioprosthetic Heart Valves
Clinical Infectious Diseases, 2006The histological features that characterize infective endocarditis in bioprosthetic valves are not accurately defined. Moreover, bioprosthetic valves may have a noninfective, degenerative evolution associated with calcifications, vegetation-like lesions, and inflammatory infiltrates.
Hubert, Lepidi +5 more
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Bioprosthetic Heart Valve Failure: Pathology and Pathogenesis
Cardiology Clinics, 1984Bioprosthetic heart valves are widely used because of their low risk of thromboembolic complications. The major limitation to the long-term success of these prostheses is caused by degenerative processes leading to late primary valve failure, including calcification.
F J, Schoen, R J, Levy
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An approach to the optimization of preparation of bioprosthetic heart valves
Journal of Biomechanics, 1991The stress and strain states of the valve leaflets during fixation with glutaraldehyde affect their final mechanical parameters. Comparative studies of the stress-strain relationships of aortic valve leaflet strips from fresh, statically and dynamically fixed porcine and human valves were made. Static pressures of 5 mmHg, 16 mmHg, and 95 mmHg result in
D, Mavrilas, Y, Missirlis
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Porcine bioprosthetic heart valves: The next generation
American Heart Journal, 2012There have been significant advances in organ xenotransplantation (cross-species transplantation), especially in the development of genetically engineered pigs, but clinical trials of solid organ transplants are still a time away. However, there is a form of pig-to-human xenotransplantation that has been taking place since the 1960s-bioprosthetic heart
Rizwan A, Manji +3 more
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Bioprosthetic Heart Valve Rupture Associated with Trauma
The Journal of Trauma: Injury, Infection, and Critical Care, 1986Disruption of a bovine pericardial bioprosthetic aortic heart valve occurred in a motor vehicle accident, and was treated by valve replacement for progressive aortic insufficiency. Leaflet rupture was through areas of noninflammatory tissue degeneration, corresponding to regions of repeated mechanical stress and trauma that occur during the normal ...
J D, Rumisek +4 more
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Bioprosthetic heart valves: the need for a quantum leap
Biotechnology and Applied Biochemistry, 2004More than 250000 bioprosthetic heart valves are being implanted annually. Although the majority of recipients are elderly developed‐world patients, the most urgent need for tissue valves is in younger patients, where rapid degeneration of contemporary prostheses remains a serious obstacle. After decades of empirical and mostly futile attempts to extend
Peter, Zilla +2 more
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Infective Endocarditis in a Hancock Bioprosthetic Heart Valve
Journal of Cardiac Surgery, 2005Contemporary prosthetic heart valves (PHV) are a good mode of treatment of valvular heart disease. They last for an average of 5 to 10 years and bioprostheses fail due to the tissue degeneration. Infective endocarditis of the prosthetic valve is a relatively rare complication occurring in 0.5% to 1% of cases per year, and its late occurrence is even ...
Jagdish W, Butany +4 more
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