Correlation between structural changes and acute thrombogenicity in transcatheter pericardium valves after crimping and balloon deployment

Authors: Bourget, Jean-Michel; Zegdi, Rachid; Lin, Jing; Wawryko, P.; Mehri, Yahye; Convelbo, C.; Mao, Jifu; Fu, Yijun; Xu, T.Merkel, N. O.; Wang, Lu; Germain, LucieZhang, ZeGuidoin, Robert
Other Title(s): Corrélation entre les altérations structurales et la thrombogénicité aiguë des valves percutanées en péricarde après sertissage et expansion
Abstract: INTRODUCTION : Transcathether heart valve replacement has gained considerable acceptance during the last decades. It is now part of the armamentarium for aortic valve replacement. The procedure proved to be highly efficient. However the issues of the blood compatibility and tissue durability were not raised and the adverse events were probably under-reported, according to observations of thrombosis after deployment. MATERIAL AND METHOD : Bovine pericardium leaflets were sewn inside a 26mm diameter stainless steel stent to manufacture these valves (one control and two experimental). The correlation between the trauma and the acute thombogenicity of bovine pericardium leaflets, after crimping and ballooning, was investigated via an in vitro blood flow with labeled platelets. These leaflets were processed for histology: scanning electron microscopy, light microscopy, and transmission electron microscopy. RESULTS : The control specimens showed a regular pericardium structure with some blood cells deposited on the collagen fibrous surface (inflow) and scarce blood cells deposited on the serous surface (outflow). After crimping and ballooning, the structure of the pericardium was severely injured, eventually with delaminations and ruptures. The blood cell uptake was considerably increased compared to the control. CONCLUSION : It would therefore be appropriate to pay more attention to the design of the valves. Specifically, the incorporation of a buffer tissue or fabric between the pericardium and the metallic stent is suggested. The issue of ballooning deserves detailed and in depth investigation regarding the lifetime of the device.
Document Type: Article de recherche
Issue Date: 8 August 2016
Open Access Date: Restricted access
Document version: VoR
This document was published in: Morphologie, Vol. 101 (332), 19-32 (2017)
Alternative version: 10.1016/j.morpho.2016.06.003
Collection:Articles publiés dans des revues avec comité de lecture

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