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Transcatheter Aortic Valve Thrombogenesis: A Foreign Materials Perspective

  • John Tarbell
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Abstract

Purpose

The initiation of thrombus formation in transcatheter aortic valves (TAVs) is not well understood. The foreign material components of a TAV may play a key role in TAV thrombogenesis. The goal of this study was to evaluate the thrombogenic potential of a TAV (entire valve) and its stent (with skirt).

Methods

Blood was collected from eight human donors with citrate anticoagulation and later reconstituted with calcium chloride. A low-volume steady flow loop (flow rate = 0.8 L/min) was designed to facilitate three separate conditions (experimental duration = 1 h) per donor blood: (1) control (n = 8), (2) stent-with-skirt (leaflets removed from a 23 mm SAPIEN XT valve; n = 8) and (3) entire valve (an intact 23 mm SAPIEN XT valve; n = 8). Samples were collected at the start and end of each experiment. Serum D-Dimer and thrombin–antithrombin (TAT) concentrations were measured as markers of thrombogenicity.

Results

There was no significant change in serum D-Dimer and TAT concentration with time for the control group. An increasing trend in D-Dimer and TAT concentration was observed with time for the stent-with-skirt group. Interestingly, there was a decreasing trend in serum D-Dimer and TAT concentration with time for the entire valve (leaflet dominating) group. Moreover, changes in D-Dimer and TAT concentration were significantly different between the stent-with-skirt and entire valve (leaflet dominating) groups.

Conclusion

Stent-with-skirt was found to impart the most prominent thrombogenic effect, indicating the significance of blood-stent and blood-skirt interactions in TAV thrombosis.

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Acknowledgments

The authors would like to acknowledge the generous funding from Tom and Shirley Gurley and President’s Undergraduate Research Award (PURA) to Priya Nair. The authors would also like to thank Phillip Trusty for his valuable suggestions.

Conflict of interest

The authors declare that they have no conflict of interest.

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Correspondence to Ajit P. Yoganathan.

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Associate Editor Hanjoong Jo oversaw the review of this article.

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Salim, M.T., Sadri, V., Nair, P. et al. Transcatheter Aortic Valve Thrombogenesis: A Foreign Materials Perspective. Cardiovasc Eng Tech 12, 28–36 (2021). https://doi.org/10.1007/s13239-020-00505-8

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  • DOI: https://doi.org/10.1007/s13239-020-00505-8

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