borderline significancep = .095
By multivariate analysis, age (HR: 1.06, 95% CI: 1.02–1.10, p = .003) and LVEF < 50% (HR: 4.71, 95% CI: 1.7–12.90, p = .003) remained significantly correlated with long‐term cardiac death; however, successful CTO PCI showed borderline significance (HR: 0.42, 95% CI: 0.15–1.16, p = .095) and LAD IRA become insignificant (Table S3 ). 3.6 Successful versus failed CTO PCI The procedural characteristics and in‐hospital results of CTO PCI are listed in Table S4 .