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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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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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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 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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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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A key to identify heart valve prostheses.
Archives of pathology, 1975A system for the identification of heart valve prostheses has been developed. A series of observations is made on the structure of a prosthesis. Following each the most appropriate choice of two or three alternative findings is made. One is then directed to the next observation until a genus of prostheses is found with structural characteristics ...
M D, Silver, B N, Datta, V F, Bowes
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[Heart failure in patients with valve prostheses].
Cardiologia (Rome, Italy), 1992Congestive heart failure in patients with prosthetic valves is a complex syndrome which poses difficult clinical and therapeutical problems. In order to identify etiologic factors, pathophysiologic substrates, clinical pictures and natural history we retrospectively evaluated 124 consecutive patients (mean age 61 +/- 11 years) with prosthetic valves ...
C, Rapezzi +9 more
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