Contemporary incidence and predictors of stent thrombosis and other major adverse cardiac events in the year after XIENCE V implantation: results from the 8,061-patient XIENCE V United States study.

OBJECTIVES

The aim of this study was to identify predictors of clinical events after XIENCE V (Abbott Vascular, Santa Clara, California) stenting.

BACKGROUND

The XIENCE V USA (XIENCE V Everolimus Eluting Coronary Stent System [EECSS] USA Post-Approval) study is a prospective, multicenter, Food and Drug Administration-required post-approval study to examine safety and effectiveness in real-world settings. After an initial 5,062 patients, 2,999 more were included as part of the DAPT (Dual Antiplatelet Therapy) trial (total n = 8,061).

METHODS

One-year clinical events, including stent thrombosis (ST), cardiac death/myocardial infarction (MI), target lesion failure, and target lesion revascularization, were adjudicated according to Academic Research Consortium criteria, with ST and cardiac death/MI as primary and co-primary endpoints. Demographic, clinical, and procedural variables were assessed by multivariable analysis. A time-dependent covariate assessed the association between DAPT usage and ST.

RESULTS

Roughly 61% were off-label; 85.6% remained on DAPT without interruption through 1 year. Incidences of definite/probable ST, cardiac death/MI, target lesion failure, and target lesion revascularization were 0.80% (95% confidence interval [CI]: 0.61% to 1.03%), 7.1% (95% CI: 6.51% to 7.68%), 8.9% (95% CI: 8.30% to 9.60%), and 4.3% (95% CI: 3.82% to 4.75%), respectively. Several independent clinical and angiographic predictors were identified for each outcome. Predictors of ST included DAPT interruption ≤ 30 days (hazard ratio [HR]: 8.63, 95% CI: 2.69 to 27.73, p = 0.0003), renal insufficiency (HR: 3.72, 95% CI: 1.71 to 8.09, p = 0.0009), and total stent length (HR: 1.30, 95% CI: 1.16 to 1.47, p < 0.0001). A DAPT interruption >30 days was not predictive of ST.

CONCLUSIONS

In this large, real-world population, XIENCE V demonstrated low event rates at 1 year, with several independent predictors. Early DAPT interruption (≤ 30 days) was the most potent predictor of ST, whereas delayed interruption (>30 days) was not predictive. (XIENCE V Everolimus Eluting Coronary Stent System [EECSS] USA Post-Approval Study; NCT00676520).