Regurgitant flow through isolated porcine aortic valves following single leaflet replacement with pericardium. Flow was determined by using a reservoir of water at height corresponding to 80 mmHg of pressure to load the distal end of the excised aorta. Efflux through the valve was collected over 60 seconds. The first row (W0H0) corresponds to the case where both the free edge width and height of the graft were equal to corresponding dimensions of the native (noncoronary) leaflet that was excised (n=3). The second row (W25H0) corresponds to the case where the height of the graft was 25% greater than that of the native (noncoronary) leaflet that was excised (n=3).