Results 281 to 290 of about 107,940 (326)
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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.
Jon Dale, Knut Rasmussen, Erik Myhre
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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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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.
Krishnan B. Chandran +2 more
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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, G. Rau, H. Reul
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Alternative mechanical heart valves for the developing world
Asian Cardiovascular and Thoracic Annals, 2019Due to the prevalence of rheumatic heart disease in the developing world, mechanical heart valves in the younger patient population remain the prostheses of choice if repair is not feasible.
E. Wium +3 more
semanticscholar +1 more source
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.
Lester R. Sauvage +2 more
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Impact of prosthetic heart valves on pregnancy in Bangladeshi women
Perfusion, 2019Background: This study evaluated pregnancy outcome in women with a prosthetic heart valve, especially with the oral anticoagulation therapy that must be weighed against the risk of intracardiac thrombosis. Methods: This multicenter, retrospective, cohort
R. Ranjan +5 more
semanticscholar +1 more source
International Journal of Artificial Organs, 2019
The past 65 years have witnessed remarkable progress in the development of safe, hemodynamically favorable mechanical heart valves. Today, there are a large number and variety of prostheses in use and many prostheses have been used for a while and then ...
M. Kalçık +9 more
semanticscholar +1 more source
The past 65 years have witnessed remarkable progress in the development of safe, hemodynamically favorable mechanical heart valves. Today, there are a large number and variety of prostheses in use and many prostheses have been used for a while and then ...
M. Kalçık +9 more
semanticscholar +1 more source
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
Frans Van de Werf +6 more
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Design of a system for the accelerated loading of heart valve prostheses
Journal of Biomechanics, 1984In this paper an equipment is described for the loading of heart valve prostheses under physiological pressure conditions at a frequency of 10 Hz. The system consists essentially of two reservoirs between which a housing is mounted for holding the valve prosthesis. The reservoirs are partly filled with liquid.
van Aa Anton Steenhoven +3 more
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