Results 241 to 250 of about 20,334 (293)

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
openaire   +2 more sources

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
openaire   +2 more sources

Mitral valve replacement with mechanical or bioprosthetic valve

Multimedia Manual of Cardio-Thoracic Surgery, 2005
A presentation on the technique of mitral valve replacement is shown: exposure and excision of the diseased mitral valve is demonstrated along with the use of sub-annular and supra-annular interrupted suture techniques for securing biological and mechanical mitral prostheses. A brief overview of the literature is presented.
David, Wheatley, Malcolm, Will
openaire   +2 more sources

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.
openaire   +3 more sources

Mechanical Prosthetic Valves

2020
Mechanical valves offer excellent durability and hemodynamics at both the aortic and mitral position but require lifelong anticoagulation. The majority of mechanical valves utilized today are bileaflet valves composed of pyrolytic carbon, and most of the newer generation valves are designed to reduce thrombogenicity and improve hemodynamics.
Matthew C. Henn, Marc R. Moon
openaire   +1 more source

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
openaire   +2 more sources

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
openaire   +2 more sources

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
openaire   +2 more sources

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
openaire   +2 more sources

Mechanisms of Expiratory Valves Resistance

American Review of Respiratory Disease, 1988
Expiratory valves are the major source of resistance in ventilator circuits. Some valves, particularly under certain conditions, cause high resistances. To establish the mechanisms of expiratory valve resistance (R), we measured R of 4 commercial valves under several experimental conditions.
R A, Kayaleh, A F, Wilson
openaire   +2 more sources