1986
DOI: 10.1055/s-2007-1020400
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Abstract: The in vitro function of 6 tissue valves and 6 mechanical valves (all size 29) was assessed in a purpose-built pulse duplicator under different pulsatile flow conditions. Valve function was analyzed by measuring the mean pressure difference across each valve during forward flow, and the reverse flow through each valve during valve closure (dynamic regurgitation) and in the fully closed position (static regurgitation). Although valves of the same type showed similar characteristics, there were significant diffe… Show more

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Cited by 32 publications
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“…18 The first stentless bioprostheses that we used in 1985 were completely unsupported. When compared to stented bioprostheses, 19 the pressure gradients were low even up to 6 years postoperatively, and no significant leaflet calcification was observed. In homografts, the incidence of valve degeneration was essentially higher, 20 probably due to immunological reactions of the unpreserved tissue.…”
Section: Resultsmentioning
confidence: 89%
“…18 The first stentless bioprostheses that we used in 1985 were completely unsupported. When compared to stented bioprostheses, 19 the pressure gradients were low even up to 6 years postoperatively, and no significant leaflet calcification was observed. In homografts, the incidence of valve degeneration was essentially higher, 20 probably due to immunological reactions of the unpreserved tissue.…”
Section: Resultsmentioning
confidence: 89%
“…The normal regurgitant volume can be up to 10% of the stroke volume [85,89]. This physiologic regurgitation of mechanical valves is less likely to be detected in mitral position than in the aortic position, which is due to the shielding of the regurgitant jets by the prosthetic valve in the mitral position [90,91].…”
Section: Mechanical Valve Regurgitationmentioning
confidence: 97%
“…The acoustic shadowing from prosthesis may lead to nonvisualization or underestimation of the severity of the regurgitation, especially with mechanical valves [88][89][90][91][92][93][94]. The transthoracic approach is better for the evaluation of aortic prosthetic valve regurgitation than the mitral prosthetic valve regurgitation because the prosthesis at aortic position does not interface in between the transducer and the regurgitant jet [77][78][79][80][81].…”
Section: Evaluation Of Prosthetic Valvular Regurgitationmentioning
confidence: 99%
“…This corresponds to a cardiac output of approximately 3 L/min. The mean pressure difference during forward flow and the regurgitant volumes per stroke were measured (18). Recordings of the valve leaflet dynamics were made on video tape.…”
Section: Valve Implantation In Sheepmentioning
confidence: 99%