Results 261 to 270 of about 64,339 (293)

The Apex bileaflet mechanical heart valve

Journal of Medical Engineering & Technology, 2021
Mechanical Heart Valves (MHVs) are known for their excellent lifespan and feasibly are the most reliable and stable valves amongst all prosthetic valves. Successful bileaflet MHVs such as the St. Jude Medical (SJM) are known for providing central blood flow and minimal pressure drop across the valve.
Hadi, Mohammadi, Arpin, Bhullar
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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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Evolution of mechanical heart valves

The Annals of Thoracic Surgery, 2000
The need for prosthetic heart valves was long recognized but seemed an impossible dream before 1952 when Dr Charles Hufnagel clinically introduced a ball valve that he placed into the descending thoracic aorta for treatment of aortic valvular insufficiency.
R A, DeWall, N, Qasim, L, Carr
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Mechanical Heart Valves in Children

Scandinavian Journal of Thoracic and Cardiovascular Surgery, 1984
Longterm follow-up of 17 children, who consecutively underwent replacement of one cardiac valve with the Björk-Shiley prosthesis, is presented. The children's mean age was 8 years (range 4-12 years) and body weight 23.5 kg (range 15.0-38.4 kg) at the time of surgery 1970-80. Nine of the 17 operations (53%) were second-stage cardiac surgery.
A, Henze, D, Lindblom, V O, Björk
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Fluid Mechanics of Heart Valves

Annual Review of Biomedical Engineering, 2004
▪ Abstract  Valvular heart disease is a life-threatening disease that afflicts millions of people worldwide and leads to approximately 250,000 valve repairs and/or replacements each year. Malfunction of a native valve impairs its efficient fluid mechanic/hemodynamic performance.
Ajit P, Yoganathan, Zhaoming, He, S, Casey Jones   +2 more
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Mechanical Heart Valves in Septuagenarians

Journal of Cardiac Surgery, 2008
To report on the use of a third-generation bileaflet mechanical valve in septuagenarians, selected to receive a mechanical valve, as compared to (a) a younger cohort undergoing same valve implant (study 1) and to (b) a matched group of septuagenarians undergoing biological implant (study 2).The study was carried out in a tertiary regional hospital in ...
Ascione, R, Culliford, LA, Rogers, CA, Wild, JM, Narajan, P, Angelini, G   +5 more
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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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Perception of Mechanical Heart Valve Sounds

Scandinavian Journal of Thoracic and Cardiovascular Surgery, 1989
Most currently used mechanical heart valve prostheses generate a distinct sound when they close. This sound is sometimes disturbing to the patient, and may impair quality of life. In a study of 285 patients followed up for a mean of 2.5 years after mechanical heart valve replacement, one-third were sometimes disturbed by sounds emanating from the ...
L I, Thulin, C H, Lührs, C L, Olin
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Warfarin in patients with mechanical heart valves

BMJ, 2020
### What you need to know A 55 year old woman with severe aortic stenosis underwent valve replacement with a mechanical valve. She has been started on warfarin and is maintaining an international normalised ratio (INR) within the target range of 2.0-3.0. She finds monitoring INR levels cumbersome.
Fiona, Catterall, Paul Rj, Ames, Chris, Isles   +2 more
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