Nephrol Dial Transplant (1999) 14: 1961-1967
© 1999 European Renal Association-European Dialysis and Transplant Association
The predictive value of cardiac troponin T measurements in subjects on regular haemodialysis
1 Departments of Nephrology and 2 Cardiology, Institut Medico-Chirurgical de Tournai, Tournai, Belgium and 3 Section of Nephrology, Department of Medicine, Academisch Ziekenhuis, Vrije Universiteit Brussel, Belgium
Correspondence and offprint requests to: J. Cl. Stolear, Service de Nephrologie, IMCHO Tournai, 80, chaussée de St Amand, B-7500 Tournai, Belgium.
Background. Cardiac troponin T (cTnT) is a subunit of the cardiac actin–myosin complex, which leaks into the circulation when myocardial necrosis is present. Detection of cTnT is associated with a poor outcome in patients with unstable angina, and is a useful tool for risk stratification. The value of cTnT determination in patients with renal failure has been questioned, and the specificity of cTnT in this particular group has not been established.
Methods. In the present study, 94 patients at a single centre were followed prospectively after three determinations of cTNT, at 1-month intervals. The outcome after 12 months was chosen as the end-point. cTnT was measured using both a quantitative chemiluminiscence immunoassay and a qualitative rapid bedside immunoassay on a test strip. The maximum of three measurements was used and was correlated with different parameters and outcome. The following statistical tests were performed: Kaplan–Meier analysis, Cox's proportional regression analysis for measuring survival and logistic regression for analysing factors influencing cTnT.
Results. Forty seven of the 94 patients had a positive cTnT by test strip defined as >0.10 ng/ml. Twenty four patients died in the follow-up period (14 from cardiovascular causes). Twenty of the 24 non-survivors had an increased cTnT by test strip and 23 had increased cTnT by laboratory immunoassay. The outcome analysed by a Cox's proportional regression analysis showed that the factors which influenced survival significantly were cTnT, the presence of ischaemic heart disease, C-reactive protein (CRP) and pre-albumin. A logistic multivariate analysis revealed that age and CRP significantly influenced cTnT. A good correlation was found between cTnT determined by test strip and in the laboratory.
Conclusion. cTnT is elevated in a large number of patients on regular haemodialysis and is a significant independent predictor of outcome. Increased cTnT is significantly predicted by age and CRP.
Keywords: cardiac troponin T; renal disease; survival
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