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Usefulness of Higher Levels of Cardiac Troponin T in Patients With Stable Angina Pectoris to Predict Risk of Acute Myocardial Infarction

      In patients with stable angina, the association between high-sensitivity cardiac troponin T (hs-cTnT) and incident acute myocardial infarction (AMI), as well as pathophysiologic mechanisms accounting for an adverse prognosis, remain to be determined. We explored the association between hs-cTnT and future AMI among 3,882 patients evaluated for suspected stable angina pectoris and investigated to which extent hs-cTnT attenuated the relations between traditional coronary heart disease (CHD) risk factors and AMI. Associations between increasing hs-cTnT categories (≤3, 4 to 9, 10 to 19, and 20 to 30 ng/L) and risk of AMI were studied by Cox regression. We investigated whether the associations between traditional CHD risk factors and future AMI were influenced by adjusting for hs-cTnT. Median age was 62 years. During median (25th to 75th percentile) 8 (6.4 to 8.7) years of follow-up, 460 (11.8%) experienced an AMI. There was a strong association between hs-cTnT categories and risk of AMI. The relation was somewhat attenuated, but still present, when adjusting for potential confounders, traditional CHD risk factors, previous peripheral vascular disease, and percutaneous coronary intervention or coronary bypass surgery. Moreover, hs-cTnT slightly attenuated the risk relations between traditional CHD risk factors and incident AMI, but each risk factor remained significantly associated with AMI. In conclusion, among patients with suspected stable angina, hs-cTnT was positively related to incident AMI.
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