Background: The BASE ACS randomized trial demonstrated non-inferiority of titanium-nitride-oxide-coated bioactive stents (BAS), compared with everolimus-eluting stents (EES), for the primary endpoint of major adverse cardiac events (MACE) in patients presenting with acute coronary syndrome (ACS) at 12-month follow-up. We report the final long-term clinical outcome of the trial.
Methods: We randomly assigned 827 patients with ACS to receive either BAS (417) or EES (410). The primary endpoint was MACE: a composite of cardiac death, non-fatal myocardial infarction (MI) or ischemia-driven target lesion revascularization (TLR) at 12-month follow-up. Analysis was performed by intention to treat. Follow-up was planned at 12months, and yearly thereafter through 7years.
Results: Mean follow-up duration was 4.2±1.9years (median 5.0years). At 5-year follow-up, BAS was non-inferior to EES for the primary endpoint of MACE (14.4% versus 17.8%, respectively; hazard ratio for BAS versus EES, 0.82; 95% confidence interval, 0.58-1.16; p=0.26 for superiority; p<0.001 for non-inferiority). The rate of non-fatal MI was lower in the BAS group (5.9% versus 9.7%, respectively, p=0.028). The rates of cardiac death and ischemia-driven TLR were comparable (2.8% versus 3.8%, and 8.3% versus 9.9%; p=0.76 and p=0.58, respectively).
Conclusions: In the current final report of the randomized BASE ACS trial in patients with ACS, BAS implantation was associated with a rate of cumulative MACE at long-term follow-up that was statistically non-inferior to EES.
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