Late differences in outcomes of patients with stable angina and an isolated lesion in the proximal left anterior descending artery treated with new-generation drug-eluting stents.

Background: New-generation drug-eluting stents have demonstrated the mid-term efficacy and safety, but possible differences between stents may emerge in a long-term period. We compared long-term outcomes of patients with chronic stable angina and an isolated de-novo lesion in the proximal left anterior descending artery that underwent percutaneous coronary intervention with Endeavor-zotarolimus eluting stents (E-ZES) and everolimus eluting stents (EES).
Methods: We prospectively enrolled 600 patients. Of these, 180 underwent E-ZES and 420 underwent EES implantation. Clinical follow-up was performed up to 7 years (median follow-up 61 months). The evaluated clinical outcomes were Target Lesion Failure (TLF), a composite of cardiac death, myocardial infarction and Target Lesion Revascularization (TLR), the Patient-Related Outcome (PRO) and stent thrombosis. Differences between groups evaluated with the Kaplan-Meier method and possible independent predictors with Cox proportional hazard regression.
Results: At 5 years, the cumulative probability for outcomes was: TLF: 13.8% versus 7.5%, p=0.025, cardiac death: 3.1% versus 2.5%, p=0.937, myocardial infarction: 1.2% versus 1.8%, p=0.829, TLR: 10% versus 3.3%, p=0.003, PRO: 19.6% versus 13.8%, p=0.528, ST: 2.5% versus 2.7%, p=0.965, for E-ZES and EES respectively. Differences between stents increased after 30 months. In multivariate analysis predictors of TLF adjusted for stent type were Diabetes mellitus and estimated Glomerular Filtration Rate (eGFR).
Conclusion: Both stents provided a favorable safety profile, with EES demonstrating better effectiveness. There was a late emergence in difference of endpoints after 30 months. Diabetes mellitus and eGFR predicted TLF.
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