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Background: In acute coronary syndrome, elevated troponins are associated with worse clinical outcomes. We examined the relationship between the level of troponin elevation and the presence of a flow-limiting lesion for patients with no history of coronary disease admitted with NSTE-ACS. Methods: From January of 2010 until April of 2013, 561 patients received coronary angiography for new-onset NSTE-ACS. The Mann-Whitney Test, chi-square test, and Spearman correlation were used to examine relationships. Inferences were made at the 0.05 level of significance. The independent samples t test and the chi square test were used to identify predictors of LV systolic dysfunctionLVSD. Results: The 430 patients with a flow-limiting coronary lesions had a higher troponin I level than the 131 patients without obstructive coronary disease (5.69 ng/ml vs. 2.85 ng/ml, p=0.002). Further, within troponin categories, those in the greater than 5.0 ng/ml group were more likely to have angiographically significant CAD than those in the less than 0.5 ng/ml group (p=0.012). Elevated troponins were also associated with increased thrombus burden, worse systolic function, higher complexity of the lesions, and worse post intervention TIMI flow. Cardiac troponin >5ng/ml [odds ratio=2.13 (95%CI=1.22 to 3.70) p=0.008] and DM [odds ratio=1.74 (95%CI=1.02 to 2.97) p=0.042] were independent predictors of LVSD. Advanced LM disease and age were marginally significant. Conclusion: The degree of cardiac troponin I elevation should be incorporated into the risk stratification models of NSTE-ACS to promptly triage high-risk patients to early

High-sensitivity troponin i and the risk of flow limiting coronary artery disease in non-ST elevation acute coronary syndrome (NSTE-ACS)