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Background Chronic total occlusion intervention remains challenging and detailed real-world data on the safety and efficacy of which are limited. This study sought to determine whether there are differences in the 1-year clinical outcomes between chronic total occlusion patients with acute coronary syndrome and stable angina following chronic total occlusion intervention. Patients and methods Data from the Korean chronic total occlusion registry were collected from May 2003 to September 2012, and a total of 3268 patients who underwent chronic total occlusion intervention were enrolled. Cardiovascular outcomes up to 12 months in the acute coronary syndrome group were compared with stable angina group. Results The acute coronary syndrome group consisted of 1657 patients, and stable angina group consisted of 1264 patients. In the acute coronary syndrome group, patients with successful chronic total occlusion intervention had a lower incidence of total death and cardiac death compared to patients with failed intervention. However, there were no significant differences in cardiovascular events in the stable angina group. The successful chronic total occlusion intervention was a significant prognostic factor for lower total death (P = 0.006, hazard ratio = 0.46) and cardiac death (P = 0.003, hazard ratio = 0.36) within acute coronary syndrome group. On the other hand, successful chronic total occlusion intervention was not a prognostic factor for cardiovascular events within stable angina group. Conclusions Successful chronic total occlusion intervention in acute coronary syndrome patients was associated with a lower incidence of cardiovascular outcome compared to patients with failed chronic total occlusion intervention.

Background Bifurcation coronary artery disease (CAD) represents 15-20% in PCI patients, however, limited data concerning the short and long term clinical outcome in AMI. Methods A total of 1402 patients underwent bifurcation lesions PCI were enrolled. Patients were divided into two groups: 1) chronic stable angina group (CSA, N = 954) and 2) acute myocardial infarction group (AMI, N = 448) (241 NSTEMI and 207 STEMI). Major adverse cardiac events (MACE), the composite of death, myocardial infarction (MI), stroke and revascularization and stent thrombosis were compared between the two groups at up to 5 years. Results At 30 days follow up, the AMI group had significantly higher incidence of total death (HR: 5.901, 95% CI : 1.879 to 18.532; p = 0.002), cardiac death (HR: 6.438, 95% CI 1.743 to 23.781; p = 0.005), MI (HR: 4.736 , 95% CI :1.646 to 13.632; p = 0.004), TLR (HR: 4.300 , 95% CI :1.295 to 14.279; p = 0.017), Stroke (HR: 5.901 , 95% CI :1.879 to 18.532; p = 0.002) and MACE (HR: 4.318, 95% CI : 1.940 to 9.611; p = 0.000) than the CSA group moreover, at 5 years follow up the AMI group had significantly higher incidence of MI , TLR , Stent Thrombosis and MACE than the CSA group.Using Multivariate logistic regression, and after adjusting for potential confounding factors, the AMI patients had higher incidence of total MACE at 30 days (HR: 3.668, 95% CI 1.572 to 8.558 ; p = 0.003) and at 5 years MACE (HR: 1.693, 95% CI 1.206 to 2.377 ; p = 0.002) Conclusion In this study, bifurcation lesion PCI in AMI setting was associated with a higher incidence of adverse clinical outcomes at 30 days and up to 5 years. Clinical Outcomes at 5 Years The incidence of Event (%) at 5 years Outcomes CSA (n = 954) AMI(n = 448) Log Rank Hazard ratio (95% Confidence interval ) P value Total death 21 (2.2) 14 (3.1) 0.285 1.443 (0.734-2838) 0.288 Cardiac death 10 (1.0) 10 (2.2) 0.078 2.160 (0.899-5.190) 0.085 Myocardial infarction 22 (2.3) 23 (5.1) 0.004 2.302 (1.283-4.130) 0.005 Revascularization 65 (6.8) 50 (11.2) 0.003 1.749 (1.210-2.529) 0.003 Target lesion 36 (3.7) 45 (6.4) 0.000 2.854 (1.831-4.448) 0.000 Target vessel 42 (4.4) 47 (10.5) 0.000 2.548 (1.680-3.863) 0.000 Non-target vessel 26 (2.7) 8 (1.8) 0.320 0.671 (0.304-1.482) 0.324 Stroke 131 (13.7) 66 (14.7) 0.555 1.093 (0.813-1.469) 0.556 Stent thrombosis 8 (0.8) 11 (2.5) 0.013 2.997 (1.205-7.451) 0.018 Total MACE 87 (9.1) 60 (13.4) 0.006 1.579 (1.135-2.196) 0.007

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Percutaneous coronary intervention (PCI) for multivessel disease has been widely used as a revascularization option for elderly patients with development of contemporary drug-eluting stents (DES). However, there are limited data regarding long-term clinical outcomes following successful PCI in

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Percutaneous coronary intervention (PCI) for ostial coronary lesions associated with inappropriate angiographic results, challenging adjustment of stent position and higher risk of cardiovascular complications. A total 3747 patients underwent PCI were included. Patients were divided into two groups