Results 231 to 240 of about 1,654 (283)

Tissue Valve Degeneration and Mechanical Valve Failure

Current Treatment Options in Cardiovascular Medicine, 2019
The management of valvular heart disease has been dramatically influenced by recent evolutions in biomedical technology and surgical practice. With an aging population worldwide and accompanying increase in the prevalence of surgical valve disease, an understanding of prosthetic valve behavior and durability is essential for proper patient selection ...
Andrew C W, Baldwin, George, Tolis
openaire   +2 more sources

Tricuspid Valve Replacement: Bioprosthetic or Mechanical Valve?

Asian Cardiovascular and Thoracic Annals, 2004
Significant morbidity and mortality is associated with tricuspid valve replacement, and controversy still exists as to the ideal prosthesis in this position. This study aimed to identify the risk factors for low cardiac output and mortality, and whether bioprosthetic or mechanical valves perform better in the tricuspid position.
Neville A G, Solomon, Remy C H, Lim, Parma, Nand, Kenneth J, Graham   +3 more
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Patents and Heart Valve Surgery - I: Mechanical Valves

Recent Patents on Cardiovascular Drug Discovery, 2013
Valvular heart disease, inherited or acquired, affects more than 5 million Americans yearly. Whereas medical treatment is beneficial in the initial stages of valvular heart disease, surgical correction provides symptomatic relief and long-term survival benefits.
F.H. Cheema, N. Hussain, A. P. Kossar, G. Polvani   +3 more
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Mechanical heart valve prostheses

Cardiovascular Pathology, 2003
Abstract Mechanical heart value prostheses have been in use since the 1950s. Many prostheses have been used for a while and then discontinued. Today, there are a large number and variety of prostheses in use and an even larger variety that are in place in patients. These may be explanted at any time for a number of reasons.
Jagdish Butany, Manmeet S. Ahluwalia, Craig Munroe, Cristina Fayet, Christina Ahn, Patrick Blit, Charis Kepron, Roberto J. Cusimano, Richard L. Leask   +8 more
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Fluid Mechanics of the Mitral Valve

Nature, 1969
THE exploitation of trapped vortices and flow deceleration by the aortic valve to ensure maximum efficiency and to make possible laminar flow1,2 suggests a similar mechanism for the atrio-ventricular valves. These are the inlet valves to the two ventricles, the mitral valve on the left side and the tricuspid valve on the right.
B J, Bellhouse, F H, Bellhouse
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Mechanical heart valve cavitation

Expert Review of Medical Devices, 2004
Cavitation was first directly related to mechanical heart valves in the mid 1980s after a series of valve failures observed with the Edwards-Duromedics valve. The damages observed indicated that cavitation could be responsible. Later, several in vitro studies visualized the bubble formation and collapse of cavitation at mechanical heart valves.
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Mechanism of Closure of the Aortic Valve

Nature, 1968
THE human aortic valve consists of three cusps made of relatively inelastic, muscle-free material about 0.15 mm thick. It opens and shuts about once a second, and withstands a pressure difference of 100 mm of mercury when closed. It usually functions for 70 yr without failure, and works so efficiently that very little blood is regurgitated at each ...
B J, Bellhouse, F H, Bellhouse
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Mechanical Decalcification of the Aortic Valve

The Annals of Thoracic Surgery, 1986
Thromboembolism and anticoagulant-related complications secondary to prosthetic aortic valve replacement constitute a significant risk (28% at 5 years). From 1978 through 1984, decalcification of the aortic valve was performed in 8 patients who were undergoing coronary artery revascularization.
R M, King, J R, Pluth, E R, Giuliani, J M, Piehler   +3 more
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Stuck Mechanical Valve in Pregnancy

Journal of Cardiac Surgery, 2008
Mechanical heart valve thrombosis during pregnancy is a challenging condition. We present a pregnant patient with stuck mechanical mitral valve. During the 36th week of pregnancy, she was admitted to our emergency clinic because of aggravated dyspnea, tachypnea, and cyanosis.
Askin A, Korkmaz, Murat, Yuce, Feride, Korkmaz, Fisun, Gulcan, Mustafa, Guden   +4 more
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Impact of calcific aortic valve disease on valve mechanics

Biomechanics and Modeling in Mechanobiology, 2021
The aortic valve is a highly dynamic structure characterized by a transvalvular flow that is unsteady, pulsatile, and characterized by episodes of forward and reverse flow patterns. Calcific aortic valve disease (CAVD) resulting in compromised valve function and increased pressure overload on the ventricle potentially leading to heart failure if ...
Brennan J. Vogl, Nicholas R. Niemi, Leigh G. Griffiths, Mohamad A. Alkhouli, Hoda Hatoum   +4 more
openaire   +2 more sources