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2010
Prosthetic heart valves may be mechanical or bioprosthetic. Mechanical valves, which are composed primarily of metal or carbon alloys, are classified according to their design as ball-caged, single-tilting-disc, or bileaflet-tilting-disc valves (Fig. 9.1). In ball-caged valves, the occluder is a sphere that is contained by a metal “cage” when the valve
Luigi P. Badano, Rosa Sicari
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Prosthetic heart valves may be mechanical or bioprosthetic. Mechanical valves, which are composed primarily of metal or carbon alloys, are classified according to their design as ball-caged, single-tilting-disc, or bileaflet-tilting-disc valves (Fig. 9.1). In ball-caged valves, the occluder is a sphere that is contained by a metal “cage” when the valve
Luigi P. Badano, Rosa Sicari
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Pulsatile flow experiments on heart valve prostheses
Medical & Biological Engineering & Computing, 1983In vitro fluid dynamic characteristics of aortic valve prostheses were experimentally measured for physiological relevant pulsatile flows using hot-film velocimetry. The prostheses studied were (i) centrally occluding ball-in-cage and (ii) tilting disc valves. The valves sewn to a plexiglass ring were placed in a specially designed valve chamber.
K B, Chandran +3 more
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MECHANISMS OF HEMOLYSIS IN PATIENTS WITH HEART VALVE PROSTHESES
Acta Medica Scandinavica, 1971Abstract. Intravascular hemolysis was studied in a large, non‐selected series of patients with aortic and mitral valvular disease or valve prostheses in order to clarify the mechanisms of the erythrocyte destruction. Hemolysis was slight in unoperated patients, even in cases with severe valvular disease.
E, Myhre, K, Rasmussen, J, Dale
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Cavitation Dynamics of Mechanical Heart Valve Prostheses
Artificial Organs, 1994Abstract: Nine different mechanical mitral heart valves were chosen in order to study cavitation dynamics in detail in an in vitro flow system simulating a single event of mitral valve closure. The transvalvular pressure (ventricular minus atrial pressure) rise rate averaged during the valve closing period was used as an index of the loading rate.
C S, Lee, K B, Chandran, L D, Chen
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Cavitation Potential of Mechanical Heart Valve Prostheses
The International Journal of Artificial Organs, 1991Just like technical check valves, the function of mechanical heart valve prostheses may presumably also lead to cavitation effects during valve closure. Due to the waterhammer effect, cavitation may primarily occur in the mitral position leading to high mechanical loading of the valve itself and of corpuscular blood elements.
T, Graf, H, Fischer, H, Reul, G, Rau
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A hydraulic figure‐of‐merit for heart valve prostheses
Journal of Biomedical Materials Research, 1967AbstractThe pressure losses in the currently available prostheses are too high. We believe an excellent way to focus designers' attention upon this fact is to rank the various designs according to their hydraulic efficiency. The proposal of this paper is for pressure drop vs.
R F, Viggers, S B, Robel, L R, Sauvage
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Antithrombotic Therapy in Patients With Heart Valve Prostheses
Cardiology in Review, 2013Heart valve prostheses carry a risk for thrombosis and require an antithrombotic strategy to prevent stroke, systemic embolism, and prosthetic valve thrombosis. Contemporary randomized trials to guide the clinician on the optimal anticoagulant treatment are scarce, and the validity of the historical data for current recommendations can be questioned in
Hadewich, Hermans +6 more
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Current heart valve prostheses.
American family physician, 1979Current heart valve prostheses may be classified as either mechanical or tissue valves (bioprostheses). The principal advantage of mechanical devices is their established long-term durability; however, chronic anticoagulation is recommended to reduce the incidence of thromboembolic complications.
E A, Lefrak, A, Starr
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MATERIALS AND HEART VALVE PROSTHESES
Annals of the New York Academy of Sciences, 1968W R, Pierie +3 more
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[Glutaraldehyde residues in heart valve prostheses].
Archiv der Pharmazie, 1991Bioprosthetic heart valves prepared from glutaraldehyde-pretreated bovine pericardium are used to replace diseased human cardiac valves. Mineralisation in the course of time and toxic effects are possibly caused by glutaraldehyde residues. Different washing methods carried out before transplantation are compared with regard to the different ability of ...
H, Spreitzer +4 more
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