In vitro hemodynamic characteristics of tissue bioprostheses in the aortic position

Hemodynamic Performance and Incidence of Patient-Prosthesis Mismatch of the Complete Supraannular Perimount Magna Bioprosthesis in the Aortic Position

“…In general, the transvalvular gradient increases exponentially with decreasing EOAI when EOAI < 0.90 cm 2 /m 2 [14]. In our series, the mean pressure gradient in patients with EOAI ≤ 0.85 cm 2 / m 2 was 13.1 ± 4.1 mm Hg vs. 8.3 ± 3.8 mm Hg in patients with EOAI > 0.85 cm 2 /m 2 (p < 0.001).…”

“…Original Cardiovascular struction. Yoganathan et al reported that the area effectively used for blood flow only accounts for 40 -70% of the total area occupied by the prosthesis [14].…”

Sinus Hemodynamics in Representative Stenotic Native Bicuspid and Tricuspid Aortic Valves: An In-Vitro Study

“…This study is one of the first studies that investigated sinus flow and aortic sinus vortex complexity in a personalized native bicuspid with fusion of the left and right coronary cusps and native tricuspid aortic valve. Previous in-vitro studies [39,40] adopted rigid axisymmetric aortic sinus chambers (without the three sinuses). In this study, as previously discussed, the diverse anatomical geometries led to tremendously different dynamics, such as different initiation and evolution of the sinus vortex along with their characteristics regarding entrapment and dissipation.…”

A Novel Pulse Duplicator System: Evaluation of Different Valve Prostheses

“…Effective orifice area (EOA) is defined as the part of the primarytheoretically possibleorifice area (POA) actually being used during systole [7,8]. The performance index (PI) of a heart valve is defined as the relation of EOA to POA.…”

“…Distilled water was used as the test fluid because previous tests with both blood and an aqueous glycerine solution damaged the precision mechanics of the experimental equipment. Furthermore, according to Yoganathan et al, aqueous glycerine solutions change the leaflet properties of tissue valves [8]. Blood has nearly the same density as distilled water (r blood ≈ 1.055 -1.065 g/cm 3 versus r distilled water ≈ 1.0 g/cm 3 ) but a viscosity which is approximately two to four times higher than distilled water.…”