Background: Drug-eluting stent (DES) platforms devoid of durable polymer have potential to enhance long-term safety outcomes. The ISAR-TEST-3 study was a randomized trial comparing three rapamycin-eluting stents with different coating strategies. The present study examined 2-year outcomes of these patients and is the first large-scale study to report long-term outcomes with biodegradable polymer and polymer-free DES.
Methods: Patients with de novo coronary lesions in native vessels were randomly assigned to receive biodegradable polymer (BP; n=202), permanent polymer (PP; Cypher; n=202) and polymer-free (PF; n=201) stents. The 2-year endpoints of interest were target lesion revascularization (TLR), death/myocardial infarction (MI), stent thrombosis, and delayed angiographic late luminal loss (LLL) between 6-8 months and 2 years.
Results: There were no significant differences in TLR (8.4%, 10.4% and 13.4% for BP, PP and PF stents respectively; p=0.26), death/MI (5.9%, 6.4% and 6.5% with BP, PP and PF respectively; p=0.97) or stent thrombosis (definite/probable 0.5%, 1.0%, 1.0% with BP, PP and PF respectively; p=0.82). Paired angiographic follow-up at 6-8 months and 2 years was available for 302 patients (69.0% of eligible). Delayed LLL was significantly different across the treatment groups: 0.17±0.42 mm, 0.16±0.41 mm and -0.01±0.36 mm for BP, PP and PF stents respectively (p<0.001).
Conclusion: Clinical antirestenotic efficacy was maintained with all three platforms between 1 and 2 years, although angiographic surveillance showed ongoing delayed LLL with both BP and PP stent platforms. At 2 years there was no signal of a differential safety profile between the three stent platforms.
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