Interleukin-6 is a stronger predictor of total and cardiovascular mortality than C-reactive protein in haemodialysis patients

Despite the well known association between interleukin-6 (IL-6) and cardiovascular mortality, no study has so far verified whether IL-6 adds prognostic information to that provided by C-reactive protein (CRP). A cohort of 218 haemodialysis patients from four different dialytic centres was followed-u...

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Published in:Nephrology, dialysis, transplantation Vol. 19; no. 5; p. 1154
Main Authors: Panichi, Vincenzo, Maggiore, Umberto, Taccola, Daniele, Migliori, Massimiliano, Rizza, Giovanni Manca, Consani, Cristina, Bertini, Alessio, Sposini, Stefano, Perez-Garcia, Rafael, Rindi, Paolo, Palla, Roberto, Tetta, Ciro
Format: Journal Article
Language:English
Published: England 01.05.2004
Subjects:
Biomarkers - blood
C-Reactive Protein - analysis
Cardiovascular Diseases - mortality
Cohort Studies
Databases, Factual
Female
Humans
Interleukin-6 - blood
Male
Middle Aged
Predictive Value of Tests
Renal Dialysis - mortality
Reproducibility of Results
Retrospective Studies
ISSN:0931-0509
Online Access:Get more information
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Summary:Despite the well known association between interleukin-6 (IL-6) and cardiovascular mortality, no study has so far verified whether IL-6 adds prognostic information to that provided by C-reactive protein (CRP). A cohort of 218 haemodialysis patients from four different dialytic centres was followed-up retrospectively. Plasma IL-6 and CRP concentrations were determined. Full information on co-morbidities was available in 162 patients. With respect to the lowest quartile (< 3.6 pg/ml for IL-6, and < 2.2 mg/l for CRP), the crude relative risk (RR) of death from all causes of the upper quartile (> 13.9 pg/ml for IL-6, and > 12.8 mg/l for CRP) was 5.20 (95% confidence interval 2.06-13.011) for IL-6 and 3.16 (1.41-7.12) for CRP. When both variables were included, the estimates were 4.10 (1.30-12.96) for IL-6 and 1.29 (0.47-3.57) for CRP. As to continuous variables, the relationship between both variables and mortality tended to level off for the highest values, but became fairly linear after log transformation of the variables. For one unit SD of the log (variable), the RR was 2.09 (1.52-2.88) for IL-6 and 1.66 (1.23-2.24) for CRP. When they were included in the same model, the estimates were 1.90 (1.18-2.82) for IL-6 and 1.16 (0.81-1.66) for CRP. IL-6 has a stronger predictive value than CRP for cardiovascular mortality and provides independent prognostic information, while conveying most of that provided by CRP.
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ISSN:0931-0509
DOI:10.1093/ndt/gfh052