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Mechanical Heart Valves in Septuagenarians [PDF]
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 ...
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The Apex bileaflet mechanical heart valve
Journal of Medical Engineering & Technology, 2021Mechanical 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.
Arpin Bhullar, Hadi Mohammadi
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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.
Chris Isles +2 more
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Mechanical Heart Valves in Children
Scandinavian Journal of Thoracic and Cardiovascular Surgery, 1984Longterm 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.
Viking Olov Björk +2 more
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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.
Zhaoming He +2 more
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Mechanical heart valve prostheses
Cardiovascular Pathology, 2003Mechanical 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.
Cristina Fayet +9 more
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MECHANICAL HEART VALVES AND PREGNANCY
Fetal and Maternal Medicine Review, 2007Mechanical heart valves pose a particular challenge in pregnancy, as the primary agent used to prevent valve thrombosis, coumadin (warfarin), is a known teratogen. Alternatives to coumadin, such as unfractionated heparin (UFH) and low-molecular weight heparin (LMWH) are safer for the fetus, particularly during the first trimester of pregnancy, but ...
Mathew Sermer, Cynthia Maxwell
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Mechanical heart valve cavitation
Expert Review of Medical Devices, 2004Cavitation 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, 1989Most 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 ...
Lars I. Thulin +2 more
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On the Closing Sounds of a Mechanical Heart Valve
Annals of Biomedical Engineering, 2005In the 1994 Replacement Heart Valve Guidance of the U.S. Food and Drug Administration (FDA), in-vitro testing is required to evaluate the potential for cavitation damage of a mechanical heart valve (MHV). To fulfill this requirement, the stroboscopic high-speed imaging method is commonly used to visualize cavitation bubbles at the instant of valve ...
Changfu Wu +5 more
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