Ultrathin bioresorbable polymer sirolimus-eluting stents in US patients undergoing coronary revascularization: 1-Year outcomes from the BIOFLOW VII trial.

Background: Ultrathin strut coronary drug-eluting stents (DES) have demonstrated improved safety and efficacy in large contemporary trials. The evaluation of an ultrathin strut DES in a post-market United States (US) patient population was undertaken.
Objective: The purpose of this post-approval study is to confirm that the clinical performance of an ultrathin strut bioresorbable polymer sirolimus-eluting stent (BP SES) in clinical practice is similar to that observed with BP SES in the BIOFLOW V pivotal trial.
Methods: BIOFLOW VII is a prospective, multicenter, single-arm US post-market approval study to confirm the clinical performance of BP SES in a real-world setting. The primary endpoint of 1-year target lesion failure (TLF) was compared with a performance goal of 6.9% based on an adapted BIOFLOW V trial BP SES TLF rate and TLF rates from other US market-released DES utilizing the Society for Cardiovascular Angiography and Interventions definition for peri-procedural myocardial infarction (MI). Subjects undergoing percutaneous coronary intervention with BP SES were consented within 24 h post-index procedure with planned follow-up through 5 years.
Results: Among 556 enrolled patients, clinical demographics included: 34.7% female, 35.6% with diabetes mellitus, and 56.8% with acute coronary syndromes. The average stent length (mean ± standard deviation) was 20.2 ± 11.8 mm, and the mean number of stents per patient was 1.3 ± 0.6. Procedure success was 99.1% (551/556), and device success was 99.9% (689/690). Among 531 subjects included in the primary endpoint analysis, the 1-year rate of TLF rate was 1.7% (9/531), and the primary endpoint was met compared with the performance goal (p < 0.0001, 95% confidence interval: 0.69%, 3.43%). Rates of target vessel MI and clinically driven target lesion revascularization were 1.3% (7/531) and 0.9% (5/531), with no occurrence of cardiac death. Definite stent thrombosis was observed for two cases (0.4%; 2/556) with one acute (≤24 h) and one late (>30 days and ≤1 year) event.
Conclusion: In a post-approval study, 1-year clinical outcomes with BP SES were consistent with prior trials supporting the safety and effectiveness of ultrathin BP SES.
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