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Pulsatile in vitro flow tests are reported on a Bjork-Shiley conduit disc valve and a prototype ball valve conduit, both used as replacements for the aortic valve and ascending aorta. Comparison is made with a model of the aortic stenosis which the conduits would be used to replace. I t isfound that although the ball valve is considerably better than the disc valve, in terms of pressure drop and power loss for a given cardiac output, both prostheses ofler large improvements on the stenotic situation.

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