Two-year real world clinical outcomes after intravascular imaging device guided percutaneous coronary intervention with ultrathin-strut biodegradable-polymer sirolimus-eluting stent

Background: There are little clinical data on imaging -guided percutaneous coronary intervention (PCI) 1 year after the biodegradable -polymer sirolimus-eluting stents (BP-SES) implantation, when the polymer disappears. Methods: We retrospectively analyzed 2455 patients who underwent successful PCI with BP-SES or durablepolymer everolimus-eluting stents (DP-EES) between September 2011 and March 2021, and compared 2 -year clinical outcomes of BP-SES (n = 459) with DP-EES (n = 1996). The outcome measures were target lesion revascularization (TLR) and major adverse cardiac events (MACE), defined as a composite of cardiac death, myocardial infarction, target vessel revascularization, and stent thrombosis. Multivariate analysis using the Cox proportional hazard model and inverse probability weighting (IPW) analysis based on the propensity score were used to evaluate the clinical outcomes. Results: The 2 -year cumulative incidences of TLR (BP-SES: 4.9% vs. DP-SES: 6.1%, p = 0.304) and MACE (10.3% vs. 12.5%, p = 0.159) were similar between the two groups. Multivariable and IPW analysis revealed the risks of TLR (p = 0.388 andp = 0.500) and MACE (p = 0.139 andp = 0.083) also had no significant difference. There was a significant interaction between none/mild and moderate/severe calcification with respect to MACE and TLR (adjusted p for interaction = 0.036 and 0.047, respectively). The risk of MACE was significantly lower in BP-SES than in DP-EES in lesions with none/mild calcification (adjusted hazard ratio [aHR]: 0.53; 95% confidence interval [CI]: 0.30-0.91), while it was similar in those with moderate/severe calcification (aHR: 0.95; 95% CI: 0.58-1.55). Conclusions: Compared with DP-EES, BP-SES demonstrated durable 2 -year clinical outcomes. However, BP-SES showed better clinical performance than DP-EES for lesions with none/mild calcification.