Circulation. 2006;113:1071-1078
Published online before print February 20, 2006, doi: 10.1161/CIRCULATIONAHA.105.570762
Published online before print February 20, 2006, doi: 10.1161/CIRCULATIONAHA.105.570762
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(Circulation. 2006;113:1071-1078.)
© 2006 American Heart Association, Inc.
Epidemiology |
Troponin I as a Predictor of Coronary Heart Disease and Mortality in 70-Year-Old Men
A Community-Based Cohort Study
From the Departments of Public Health and Caring Sciences/Geriatrics (B.Z.) and Medical Sciences (P.V., N.J.), University of Uppsala, Uppsala, Sweden.
Correspondence to Björn Zethelius, Md, PhD, Department of Public Health and Caring Sciences/Geriatrics, Uppsala Science Park, 75185 Uppsala, Sweden. E-mail bjorn.zethelius{at}pubcare.uu.se
Received June 22, 2005; revision received November 23, 2005; accepted December 23, 2005.
Background— Cardiac troponin I (cTnI), a standard for detection of myocardial damage, has recently been reported to predict acute myocardial infarction or death in patients with unstable coronary heart disease (CHD). Cardiac TnI concentrations increase with age in subjects free from clinical signs of CHD, suggesting silent myocardial damage. We investigated the association between cTnI and future CHD and mortality in a community-based cohort of men.
Methods and Results— A community-based study was conducted from August 1991 to May 1995 among 1203 men in Uppsala, Sweden, aged 70 years at baseline with a follow-up of up to 10.4 years with the use of registry data (National Board of Health and Welfare, Sweden). CHD was defined with the use of data taken from the Cause of Death Registry or from first-time hospitalization for CHD as recorded in the Hospital Discharge Registry. Cardiac TnI concentrations were measured blinded for outcome, in frozen baseline plasma samples, with the use of the AccuTnI from Beckman Coulter, Inc. Hazard ratios (HRs) from Cox proportional hazards are presented with 95% confidence intervals (CIs) for a 1-SD increase. In men free from cardiovascular disease (CVD), cTnI predicted death (HR, 1.26; 95% CI, 1.08 to 1.46; P=0.003) or first CHD event (HR, 1.31; 95% CI, 1.11 to 1.54; P=0.001) after adjustment for conventional risk factors: total and HDL cholesterol, plasma glucose, body mass index, smoking, and systolic blood pressure.
Conclusions— In this first longitudinal report, cTnI was shown to predict death and first CHD event in men free from CVD at baseline, indicating the importance of silent cardiac damage in the development of CHD and mortality.
CLINICAL PERSPECTIVE
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