title: Comparison of four different cardiac troponin assays in patients with end-stage renal disease on chronic haemodialysis.
abstract: BACKGROUND
  Several studies have documented the importance of troponin elevation as a prognostic marker in end-stage renal disease (ESRD). The reason for the elevated concentrations is not clarified. We do not know whether the different assays recognize the same patients within ESRD populations. The aim of this study was to compare concentrations of troponin measured by four different assays in a cohort of patients with ESRD, to investigate whether haemodialysis affects troponin concentrations, and to compare the prognostic potential of the different assays.
  
  
  METHODS
  We included 109 patients on chronic haemodialysis. Serum cardiac troponin T (cTnT) was measured pre- and postdialysis using Elecsys 2010 and troponin I (cTnI) using Access AccuTnI, Dimension RxL and AIA-600II.
  
  
  RESULTS
  The cTnT assay had the highest percentage of elevated concentrations for all chosen cut-offs with a reduction in percentage of patients with elevated concentrations during haemodialysis. Elecsys 2010 and AIA-600II demonstrated a significant increased mortality with raised concentrations of troponin.
  
  
  CONCLUSIONS
  The diverging results in previous studies are most likely based on substantial differences in the analytical performance of the assays. The prognostic value of cTnT appears superior to cTnI, which amplifies the prognostic significance of this cardiovascular marker in patients with ESRD.
authors.affiliation: Department of Cardiology end Endocrinology, Frederiksberg University Hospital, Copenhagen, Denmark. lhm@dadlnet.dk
authors.forename: Lene
authors.initials: L
authors.lastname: Helleskov Madsen
authors.forename: Søren
authors.initials: S
authors.lastname: Ladefoged
authors.forename: Per
authors.initials: P
authors.lastname: Hildebrandt
authors.forename: Dan
authors.initials: D
authors.lastname: Atar
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D015415:Biomarkers / Q000097:blood; D005260:Female; D006801:Humans; D007118:Immunoassay / Q000379:methods*; D007676:Kidney Failure, Chronic / Q000097:blood* / Q000401:mortality / Q000628:therapy*; D008297:Male; D008875:Middle Aged; D011379:Prognosis; D006435:Renal Dialysis; D014336:Troponin / Q000097:blood*; D020107:Troponin T / Q000097:blood; D055815:Young Adult
chemical_list: D015415:Biomarkers; D014336:Troponin; D020107:Troponin T