scholarly journals Surgical validation of the accuracy of multiplane transesophageal echocardiographic planimetry in the quantification of anatomic aortic valve orifice area in patients with aortic stenosis

1996 ◽  
Vol 27 (2) ◽  
pp. 395
Author(s):  
Ravi Kasliwal ◽  
Rajesh Rohatgi ◽  
Praveer Aggrawal ◽  
Naresh Trehan ◽  
Natesa Pandian
Keyword(s):  
Aortic Valve ◽  
Aortic Stenosis ◽  
Orifice Area ◽  
Valve Orifice ◽  
Valve Orifice Area

Further insights into normal aortic valve function: role of a compliant aortic root on leaflet opening and valve orifice area

2004 ◽  
Vol 77 (3) ◽  
pp. 844-851 ◽  
Author(s):  
Vangipuram Canchi Sripathi ◽  
Ramarathnam Krishna Kumar ◽  
Komarakshi R Balakrishnan
Keyword(s):  
Aortic Valve ◽  
Aortic Root ◽  
Orifice Area ◽  
Valve Orifice ◽  
Valve Function ◽  
Valve Orifice Area

Abstract 12568: Impact of Aortic Stenosis on Myofiber Stress: Translational Application of Left Ventricle-Aortic Coupling Simulations

Circulation ◽  
2020 ◽  
Vol 142 (Suppl_3) ◽  
Author(s):  
Andrew D Wisneski ◽  
Yunjie Wang ◽  
Reza Salari ◽  
Steve Levine ◽  
Jiang Yao ◽  
...  
Keyword(s):  
Left Ventricle ◽  
Aortic Stenosis ◽  
Patient Specific ◽  
Element Analysis ◽  
Orifice Area ◽  
Valve Orifice ◽  
Lv Dysfunction ◽  
Cardiac Model ◽  
Hyperelastic Model ◽  
Valve Orifice Area

Introduction: Grading aortic stenosis (AS) has traditionally relied on measuring hemodynamic parameters of transvalvular pressure gradient, ejection jet velocity, or estimating valve orifice area. Recent research has highlighted limitations of these criteria at effectively grading AS in presence of left ventricle (LV) dysfunction. We hypothesize that simulations coupling the aorta and LV will provide meaningful insight into myocardial biomechanical derangements that accompany AS. Reference data from the normal ventricle should first be obtained. Methods: A multi-domain cardiac model with representative anatomy and material properties was used to create AS simulations. Finite element analysis was performed with ABAQUS FEA®. An anisotropic hyperelastic model was assigned to the aorta and LV passive properties, while time-varying elastance function governed LV active response. Mild and severe AS were created by restricting the aortic valve orifice area. Results: Global LV myofiber end systolic (ES) stress (mean±SD) was 9.31±10.33 kPa at baseline (no AS), 13.13±10.29 kPa for mild AS, and 16.18±10.59 kPa with severe AS. Mean LV myofiber ES strains were -22.4±8.7%, -22.2±8.9%, and -21.9±9.2%, respectively. Mild and severe AS had significant stress elevation compared to baseline (mild AS vs base; p<0.01, severe AS vs base; p<0.001) and when compared to each other (p<0.01). See Figure 1 . Ventricular regions that experienced greatest magnitude ES stress were (severe AS vs baseline) basal inferior (39.87±14.73 vs 30.02±12.08 kPa; p<0.01), mid-anteroseptal (32.29±11.56 vs 24.79±12.00 kPa; p<0.001), and apex (27.99±8.44 vs 23.52±10.19 kPa; p<0.001). Conclusions: Isolated AS in a normal heart was simulated, and significantly elevated LV myofiber stress was quantified. This data serves as a comparison to future studies that will incorporate patient-specific ventricular geometries and material parameters, aiming to correlate LV biomechanics to AS severity.

Determination of aortic valve orifice area in aortic valve stenosis by two-dimensional transesophageal echocardiography

1987 ◽  
Vol 59 (4) ◽  
pp. 330-335 ◽  
Author(s):  
Thomas Hofmann ◽  
Wolfgang Kasper ◽  
Thomas Meinertz ◽  
Gerhard Spillner ◽  
Volker Schlosser ◽  
...  
Keyword(s):  
Aortic Valve ◽  
Transesophageal Echocardiography ◽  
Aortic Valve Stenosis ◽  
Two Dimensional ◽  
Orifice Area ◽  
Valve Orifice ◽  
Valve Orifice Area

The presence of fructosamine in human aortic valves is associated with valve stiffness

2016 ◽  
Vol 69 (9) ◽  
pp. 772-776 ◽  
Author(s):  
Antoine S Kishabongo ◽  
Philippe Katchunga ◽  
Justin C Cikomola ◽  
Filip M De Somer ◽  
Marc L De Buyzere ◽  
...  
Keyword(s):  
Aortic Valve ◽  
Heart Valves ◽  
Biomechanical Properties ◽  
Pressure Gradients ◽  
Aortic Valves ◽  
Transthoracic Doppler Echocardiography ◽  
Orifice Area ◽  
Valve Orifice ◽  
Valve Orifice Area

AimsHuman heart valves are prone to glycation, a fundamental process of ageing. The aim of this study was to establish the relationship between fructosamine formation and the mechanical properties of human aortic valves.Methods67 patients (age: 76±8 years) diagnosed with an aortic valve stenosis, who underwent an aortic valve replacement were enrolled. Fructosamine and calcium concentrations in aortic valves were determined. Using a transthoracic Doppler echocardiography, aortic valve orifice area and transvalvular pressure gradients were measured. In a subgroup of 32 patients, the aortic valve orifice area was sufficient to carry out mechanical testing on a LFPlus Universal material tester. An in vitro removal of fructosamine of the valve was initiated using ATP-dependent fructosamine 3-kinase (FN3K).ResultsA significant correlation was found between the aortic valve fructosamine concentration and the calculated aortic valve orifice area: Y (aortic valve orifice area, mm2)=1.050−0.228X (aortic valve fructosamine concentration, µmol/g valve) (r=−0.38). A significantly higher calcium concentration was measured in the aortic valves of diabetics in comparison with those of non-diabetics. A multiple regression analysis revealed that the presence of diabetes mellitus and aortic valve fructosamine concentration were the main predictors of the extensibility of the aortic valves. In the in vitro deglycation study, a significant lower aortic valve fructosamine concentration was detected after treatment with FN3K. This resulted in an increased flexibility of the aortic valves.ConclusionsAlthough no direct causativeness is proven with the presented results, which just show an association between fructosamine, the effect of FN3K and aortic valve stiffness, the present study points for the first time towards a possible additional role of the Amadori products in the biomechanical properties of ageing aortic valves.

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