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- Title
One-year performance of biorestorative polymeric coronary bypass grafts in an ovine model: correlation between early biomechanics and late serial Quantitative Flow Ratio.
- Authors
Wu, Xinlei; Ono, Masafumi; Poon, Eric K W; O'Leary, Neil; Torii, Ryo; Janssen, Johannes P; Zhu, Shuang Jie; Vijgeboom, Yves; El-Kurdi, Mohammed S; Cox, Martijn; Reinöhl, Jochen; Dijkstra, Jouke; Barlis, Peter; Wijns, William; Reiber, Johan H C; Bourantas, Christos V; Virmani, Renu; Onuma, Yoshinobu; Serruys, Patrick W
- Abstract
Open in new tab Download slide Open in new tab Download slide OBJECTIVES This study aimed to investigate the impact of mechanical factors at baseline on the patency of a restorative conduit for coronary bypass grafts in an ovine model at serial follow-up up to 1 year. METHODS The analyses of 4 mechanical factors [i.e. bending angle, superficial wall strain and minimum and maximum endothelial shear stress (ESS)] were performed in 3D graft models reconstructed on baseline (1-month) angiograms frame by frame by a core laboratory blinded for the late follow-up. The late patency was documented by Quantitative Flow Ratio (QFR®) that reflects the physiological status of the graft. The correlation between 4 mechanical factors and segmental QFR (△QFR) were analysed on 10 equal-length segments of each graft. RESULTS A total of 69 graft geometries of 7 animals were performed in the study. The highest △QFR at 12 months was colocalized in segments of the grafts with the largest bending angles at baseline. Higher △QFR at 3 months were both at the anastomotic ends and were colocalized with the highest superficial wall strain at baseline. High baseline ESS was topographically associated with higher △QFR at the latest follow-up. Correlations of minimum and maximum ESS with △QFR at 3 months were the strongest among these parameters (ρ = 0.30, 95% CI [−0.05 to 0.56] and ρ = 0.27, 95% CI [−0.05 to 0.54], respectively). CONCLUSIONS Despite the limited number of grafts, this study suggests an association between early abnormal mechanical factors and late flow metrics of the grafts. The understanding of the mechanical characteristics could help to improve this novel conduit.
- Subjects
CORONARY artery bypass; IMPACT (Mechanics); BIOMECHANICS; SHEARING force
- Publication
European Journal of Cardio-Thoracic Surgery, 2022, Vol 61, Issue 6, p1402
- ISSN
1010-7940
- Publication type
Article
- DOI
10.1093/ejcts/ezab554