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15 results on '"Stanová, Viktória"'

3. Valve-in-Valve Transcatheter Aortic Valve Replacement and Bioprosthetic Valve Fracture Comparing Different Transcatheter Heart Valve Designs: An Ex Vivo Bench Study

Author

Sathananthan, Janarthanan, Sellers, Stephanie, Barlow, Aaron M., Stanová, Viktória, Fraser, Rob, Toggweiler, Stefan, Allen, Keith B., Chhatriwalla, Adnan, Murdoch, Dale J., Hensey, Mark, Lau, Karen, Alkhodair, Abdullah, Dvir, Danny, Asgar, Anita W., Cheung, Anson, Blanke, Philipp, Ye, Jian, Rieu, Régis, Pibarot, Phillippe, Wood, David, Leipsic, Jonathan, and Webb, John G.

Published
2019
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7. Leaflet stress quantification of porcine vs bovine surgical bioprostheses: an in vitro study.

Author

Stanová, Viktória, Godio Raboutet, Yves, Barragan, Paul, Thollon, Lionel, Pibarot, Philippe, and Rieu, Régis

Subjects
*HEART valve prosthesis implantation, *BIOPROSTHESIS, *BIOPROSTHETIC heart valves, *DIGITAL image correlation, *AORTIC valve transplantation
Abstract

Calcified aortic stenoses are among the most prevalent form of cardiovascular diseases in the industrialized countries. This progressive disease, with no effective medical therapy, ultimately requires aortic valve replacement – either a surgical or very recently transcatheter aortic valve implantation. Increase leaflet mechanical stress is one of the main determinants of the structural deterioration of bioprosthetic aortic valves. We applied a coupled in vitro/in silico method to compare the timing, magnitude, and regional distribution of leaflet mechanical stress in porcine versus pericardial bioprostheses (Mosaic and Trifecta). A double activation simulator was used for in vitro testing of a bioprosthesis with externally mounted pericardium (Abbott, Trifecta) and a bioprosthesis with internally mounted porcine valve (Medtronic, Mosaic). A non-contact system based on stereophotogammetry and digital image correlation (DIC) with high spatial and temporal resolution (2000 img/s) was used to visualize the valve leaflet motion and perform the three-dimensional analysis. A finite element model of the valve was developed, and the leaflet deformation obtained from the DIC analysis was applied to the finite element model calculate local leaflet mechanical stress throughout the cardiac cycle. The maximum leaflet stress was higher with the pericardial versus the porcine bioprosthesis (2.03 vs. 1.30 MPa) For both bioprostheses the highest values of leaflet stress occurred during diastole and were primarily observed in the upper leaflet edge near the commissures and to a lesser extent in the mid-portion of the leaflet body. In conclusion, the coupled in vitro/in silico method described in this study shows that the highest levels of leaflet stress occur in the regions of the commissures and mid-portion of the leaflet body. This method may have important insight with regard to bioprosthetic valve durability. Our results suggest that, compared to porcine bioprostheses, those with externally mounted pericardium have higher leaflet mechanical stress, which may translate into shorter durability. [ABSTRACT FROM AUTHOR]

Published
2022
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9. A bench test study of bioprosthetic valve fracture performed before versus after transcatheter valve-in-valve intervention

Author

Sathananthan, Janarthanan, primary, Fraser, Rob, additional, Hatoum, Hoda, additional, Barlow, Aaron M., additional, Stanová, Viktória, additional, Allen, Keith B., additional, Chhatriwalla, Adnan K., additional, Rieu, Régis, additional, Pibarot, Philippe, additional, Dasi, Lakshmi Prasad, additional, Søndergaard, Lars, additional, Wood, David A., additional, and Webb, John G., additional

Published
2020
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11. TCT-33 Bioprosthetic Valve Fracture Performed Pre– Versus Post–Valve-in-Valve Transcatheter Aortic Valve Replacement: Insights From Bench Testing

Author

Sathananthan, Janarthanan, primary, Fraser, Rob, additional, Hatoum, Hoda, additional, Barlow, Aaron, additional, Stanová, Viktória, additional, Hensey, Mark, additional, Landes, Uri, additional, Alkhodair, Abdullah, additional, Sellers, Stephanie, additional, Cheung, Anson, additional, Ye, Jian, additional, Allen, Keith, additional, Chhatriwalla, Adnan, additional, Blanke, Philipp, additional, Rieu, Régis, additional, Pibarot, Philippe, additional, Dasi, Lakshmi, additional, Leipsic, Jonathon, additional, Wood, David, additional, and Webb, John, additional

Published
2019
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13. Effect of size and position of self-expanding transcatheter valve on haemodynamics following valve-in-valve procedure in small surgical bioprostheses: an in vitro study

Author

Zenses, Anne-Sophie, primary, Evin, Morgane A., additional, Stanová, Viktória, additional, Clavel, Marie-Annick, additional, Barragan, Paul, additional, Rodés-Cabau, Josep, additional, Obadia, Jean-François, additional, Pibarot, Philippe, additional, and Rieu, Régis, additional

Published
2018
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15. Leaflet Mechanical Stress in Different Designs and Generations of Transcatheter Aortic Valves: An in Vitro Study

Author

Stanová, Viktória, Rieu, Régis, Thollon, Lionel, Salaun, Erwan, Rodés-Cabau, Josep, Côté, Nancy, Mantovani, Diego, and Pibarot, Philippe

Abstract

It is unknown whether bioprostheses used for transcatheter aortic valve implantation will have similar long-term durability as those used for surgical aortic valve replacement. Repetitive mechanical stress applied to the valve leaflets, particularly during diastole, is the main determinant of structural valve deterioration. Leaflet mechanical stress cannot be measured in vivo. The objective of this in vitro/in silico study was thus to compare the magnitude and regional distribution of leaflet mechanical stress in old vs new generations of self-expanding (SE) vs balloon expandable (BE) transcatheter heart valves (THVs).

Published
2023
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