Small aortic annulus: The hydrodynamic performances of 5 commercially available bileaflet mechanical valves

Coronary perfusion: Impact of flow dynamics and geometric design of 2 different aortic prostheses of similar size

“…Conversely, the MMU bioprosthesis demonstrated a central flow very close to the natural geometry, hallowing a less turbulent flow passage during the systolic phase of cardiac cycle and a physiologic leaflet closure during the diastolic phase with negligible regurgitation. 17 This study also revealed evident stress-induced abnormalities of the cardiac cycle in all patients after AVR. As is widely known, the total cardiac cycle duration is algebraically dependent on the heart rate (60,000 ms/heart rate), which is the major determinant affecting diastolic and systolic duration.…”

Echocardiographic Signature of the On‐X Valve

“…Upon its release, the On‐X valve was reported to have superior hemodynamics compared to other bileaflet valves 6,7 . Newer bileaflet valves, specifically the St. Jude Regent valve, have also been shown to have similar improved hemodynamics compared to the On‐X valve, especially in patients with a small aortic root 8,9 . The advantage of using the On‐X valve, however, may be its low propensity to thrombogenesis 10 .…”

Intra-Supra Annular Aortic Valve and Complete Supra Annular Aortic Valve: A Literature Review and Hemodynamic Comparison

“…Although the Top Hat valve labeled 23 and the MCRI On-X valve labeled 19 can almost fit into the same artificial annulus (a diameter of 19.5mm and 20 mm, respectively), they can not fit into the same 21-mm valve holder which imitates the aortic root because the ESRD (Fig. 1) is 27.5 mm (14) for the Top Hat labeled 23 and only 22 mm (13) for the On-X labeled 19. This explains why Bottio T and colleagues (14) had to choose a Top Hat labeled 21, instead of 23, in their in vitro study.…”