Dedicated Bifurcation Stent for the Treatment of Bifurcation Lesions InvolvingLarge Side Branches: Outcomes From the Tryton Confirmatory Study

Généreux, Philippe; Kumsars, Indulis; Schneider, Joel E.; Lesiak, Maciej; Redfors, Björn; Cornelis, Kristoff; Selmon, Matthew R.; Dens, Jo; Hoye, Angela; Metzger, D. Christopher; Muyldermans, Luc; Slagboom, Ton; Francese, Dominic P.; Ayele, Girma Minalu; Laak, Linda L.; Bartorelli, Antonio L.; Cutlip, Donald E.; Kaplan, Aaron V.; Leon, Martin B.

Abstract

Objectives: The aim of this study was to prospectively study and confirm the safety and efficacy of the Tryton Side Branch Stent in the treatment of coronary artery bifurcations involving large side branches (SBs). Background The TRYTON Pivotal randomized controlled trial (RCT) was designed to compare the Tryton stent with standard provisional SB stenting in large vessels. The trial inadvertently enrolled patients with too small SBs ( < 2.25 mm). The overall trial did not meet its primary endpoint, because of an increased rate of periprocedural myocardial infarction in the Tryton stent arm. A post hoc analysis restricted to the intended population showed that the trial would have met its endpoint if only patients with SBs ≥2.25 mm in diameter (by core laboratory quantitative coronary angiography) had been enrolled.

Methods
The Tryton Confirmatory Study was a prospective, single-arm extension of the TRYTON Pivotal RCT that enrolled an additional 133 patients treated with the Tryton Side Branch Stent. It was designed to confirm the results of the post hoc analysis and emphasized the inclusion of appropriately sized SBs. The primary endpoint was noninferiority with regard to periprocedural myocardial infarction (creatine kinase myocardial band 3 times the upper limit of normal) compared with a performance goal based on the TRYTON Pivotal RCT.

Results
Among the 133 enrolled patients, 132 (99.2%) had SBs ≥2.25 mm. Baseline clinical and angiographic parameters were similar in this study and the RCT. Periprocedural myocardial infarction occurred in 10.5% of patients, which was numerically lower than the provisional group in the TRYTON Pivotal RCT (11.9%). The 95% confidence bounds did not extend beyond the pre-defined performance goal of 17.9%, meeting the noninferiority primary endpoint.

Conclusions
The Tryton Confirmatory Study, in conjunction with the post hoc analysis of the intended population in the TRYTON Pivotal RCT, supports the safety and efficacy of the Tryton Side Branch Stent for treatment of bifurcation lesions involving large SBs.

Citation

Généreux, P., Kumsars, I., Schneider, J. E., Lesiak, M., Redfors, B., Cornelis, K., Selmon, M. R., Dens, J., Hoye, A., Metzger, D. C., Muyldermans, L., Slagboom, T., Francese, D. P., Ayele, G. M., Laak, L. L., Bartorelli, A. L., Cutlip, D. E., Kaplan, A. V., & Leon, M. B. (2016). Dedicated Bifurcation Stent for the Treatment of Bifurcation Lesions InvolvingLarge Side Branches: Outcomes From the Tryton Confirmatory Study. JACC: Cardiovascular Interventions, 9(13), 1338-1346. https://doi.org/10.1016/j.jcin.2016.03.042

• Journal Article Type: Article
• Acceptance Date: Mar 24, 2016
• Online Publication Date: Jul 4, 2016
• Publication Date: Jul 11, 2016
• Deposit Date: Apr 9, 2019
• Journal: JACC: Cardiovascular Interventions
• Print ISSN: 1936-8798
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 9
• Issue: 13
• Pages: 1338-1346
• DOI: https://doi.org/10.1016/j.jcin.2016.03.042
• Keywords: Bifurcation; PCI; Side branch; Stent; Tryton dedicated bifurcation stent
• Public URL: https://hull-repository.worktribe.com/output/1567794
• Publisher URL: https://www.sciencedirect.com/science/article/pii/S1936879816304903?via%3Dihub
• Additional Information: This article is maintained by: Elsevier; Article Title: Dedicated Bifurcation Stent for the Treatment of Bifurcation Lesions Involving Large Side Branches; Journal Title: JACC: Cardiovascular Interventions; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.jcin.2016.03.042; Content Type: article; Copyright: © 2016 by the American College of Cardiology Foundation. Published by Elsevier