Analysis of the design and dynamics of aortic bioprostheses in vivo

Size and distensibility of the aortic root and aortic valve function after different techniques of the Ross procedure

“…This interrelation between supra-aortic ridge displacement and leaflet motion greatly determines the stress on the leaflets. 24,25 We found no significant differences in the distensibility parameters at the supra-aortic ridge level between the operative techniques and control subjects. These normal values of distensibility probably decrease leaflet stresses 24,25 and thus serve to contribute to the durabil- ity of valve function.…”

“…24,25 We found no significant differences in the distensibility parameters at the supra-aortic ridge level between the operative techniques and control subjects. These normal values of distensibility probably decrease leaflet stresses 24,25 and thus serve to contribute to the durabil- ity of valve function. In addition these data also provide some evidence that the inclusion technique does not lead to increased stiffness by the double wall as suggested by Ross.…”

In vivo analysis of aortic valve dynamics by transesophageal 3-dimensional echocardiography with high temporal resolution

“…Geometry and dynamic changes of aortic bioprostheses have been studied for the most part experimentally. 40,41 3D echocardiography could make comparable studies in humans possible. 3.…”

A “Semi-Supported” Porcine Xenograft - Description and First Clinical Use

“…14). Design parameters of the stented bioprostheses and the configuration of the leaflets (20). as well as the rigidity (8.…”

“…and height (12) ofthe commissural stents are primary factors for unphysiological stresses. A reduction of stresses on the leaflets by modification of the design in imitation of the natural aortic valve apparatus should theoretically improve their hemodynamic function and durability (20).…”