An in-vitro assessment of the hydraulic characteristics of the mark II Abrams-Lucas mitral valve prosthesis.
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TLDR
The pressure gradient of the Abrams-Lucas valve was significantly lower than that of the 29 mm Björk-Shiley valve and all other prostheses tested, but its reflux level was higher at 12 ml per stroke.Abstract:
As a result of the durability problems associated with the first Abrams-Lucas mitral valve, a redesigned model has recently been introduced into limited clinical trials. The new valve was subjected to in-vitro pulsatile flow studies, and measurements were made of mean diastolic pressure gradient and volume of reflux on closure. Similar measurements were made on other mitral valve prostheses of comparable size. High-speed cinematography was used to analyse the motion of the occluder during the simulated cardiac cycle, and the flow patterns produced by the valve in the model ventricular cavity were observed and photographed. The pressure gradient of the Abrams-Lucas valve was significantly lower than that of the 29 mm Bjork-Shiley valve and all other prostheses tested, but its reflux level was higher at 12 ml per stroke. The valve opened and closed smoothly and the flow visualisation study revealed that the valve produced a large vortex or swirl in the model ventricular cavity.read more
Citations
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In vitro hydrodynamic comparison of mitral valve prostheses at high flow rates
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References
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Journal ArticleDOI
Quantitative Angiocardiography IV. Relationships of Left Atrial and Ventricular Pressure and Volume in Mitral Valve Disease
TL;DR: Quantitative angiocardiographic methods have been used to determine left ventricular volume andLeft ventricular mass (LVM) in 100 patients with isolated mitral valve disease and the data are presented with cumulative distribution curves suitable for reference standards.
Journal ArticleDOI
An improved method for determining the flow characteristics of prosthetic mitral heart valves
J. T. M. Wright,L. J. Temple +1 more
TL;DR: The design and construction of a suitable rig for the testing of prosthetic mitral valves is described and the results obtained will be presented in a subsequent paper.
Journal ArticleDOI
A Flow Visualization Study of Prosthetic Aortic and Mitral Heart Valves in a Model of the Aorta and Left Heart
J T M Wright,L J Temple +1 more
TL;DR: An in vitro flow visualization study has been carried out on a range of aortic and mitral valve prostheses mounted in rigid, transparent models of the aorta and left ventricle, finding the aorted ball valve was found to produce less flow disturbance than either tilting disc valve or the porcine bioprosthesis.
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