Incremental value of a combination of cardiac troponin T, N-terminal pro-brain natriuretic peptide and C-reactive protein for prediction of mortality in end-stage renal disease

Abstract

Objective. To determine the relative prognostic merits of C-reactive protein (CRP), cardiac troponin T (cTnT) and N-terminal pro-brain natriuretic peptide (NT-pro-BNP) for prediction of all-cause death in patients with end-stage renal disease (ESRD) receiving haemodialysis. Material and methods. This prospective, controlled cohort study included 109 patients. Biomarkers were sampled at inclusion and considered as categorical and continuous variables in Cox proportional hazard models. Results. Mean follow-up ± SD was 926 ± 385 days, during which 52 patients (48%) died. All three markers were predictive of death in univariate analysis. In multivariable analysis, elevated cTnT (> 0.01 μg/l) and CRP (> 1.0 mg/dl) remained significantly associated with mortality [hazard ratio (95% confidence interval), 3.2 (1.2–8.5), p = 0.017 for cTnT; 2.0 (1.0–3.8), p = 0.032 for CRP], while NT-pro-BNP lost independent prognostic power. Addition of cTnT and CRP to established risk factors significantly improved the global fit of the model (p < 0.001), increased the c statistic from 0.726 to 0.758 and significantly increased the integrated discrimination improvement (p < 0.001). Conclusion. The results suggest that cTnT and CRP can be used in combination for risk stratification in patients with ESRD and highlight the additive effect they confer in this regard.

Key Words::

• Biomarkers
• c statistic
• end-stage renal disease
• haemodialysis
• integrated discrimination improvement
• mortality.

Declaration of interest: The authors report no conflicts of interest. The authors alone are responsible for the content and writing of the paper.