Abstract
Abstract Background Stent thrombosis (ST) is a potentially fatal complication after percutaneous coronary intervention (PCI). The association between P2Y12 reaction unit (PRU) level and stent thrombosis occurrence is not fully elucidated. Methods Based on the multicenter, observational PTRG-DES (Platelet function and genoType-Related long-term proGnosis in DES-treated patients) registry of patients with drug-eluting stents (DES) implantation, a total of 11,714 patients with PRU values were identified. The independent predictors of early stent thrombosis (EST) were assessed. The primary outcome after EST was the composite of cardiac death, myocardial infarction and any revascularisation. Key secondary outcomes were all-cause death, cardiac death, myocardial infarction, and any revascularisation. Results EST, defined as definite ST in less than 1 month after index PCI, was identified in a total of 51 patients. The PRU value was significantly higher in the EST group (263.5 ± 70.8 vs. 217.5 ± 78.7, p<0.001). In multivariable analysis, having a PRU value of ≥252 (OR, 5.10; 95% CI, 1.58-16.46; p=0.006) and an ARU value of ≥414 (OR 4.85; 95% CI, 1.07-21.97; p=0.040) were significant predictors of EST. The use of first-generation DES (OR 3.56; 95% CI, 0.98-12.99; p=0.054) also posed a higher risk for EST occurrence with a borderline significance. Cumulative incidence of the primary composite outcome was significantly higher in patients with EST (HR 18.7; 95% CI 12.8-27.3; p<0.001). Conclusion In patients treated with clopidogrel after successful DES implantation, EST was associated with higher PRU values, and a greater rate of adverse outcomes, including all-cause death and MI.
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