title: Prognostic use of cardiac troponin T and troponin I in patients with heart failure.
abstract: BACKGROUND
  Troponin T (cTnT) and troponin I (cTnI) are present in the sera of some heart failure (HF) patients and have potential importance as prognostic markers.
  
  
  OBJECTIVE
  To prospectively evaluate the prognostic value of cTnT and cTnI in well-characterized HF patients and clarify their relationship to other clinical markers of HF severity.
  
  
  METHODS
  cTnT and cTnI were measured in 78 HF patients (45 inpatients, 33 outpatients) who were followed up prospectively for 12 months.
  
  
  RESULTS
  Plasma cTnT (> or =0.02 ng/mL) and cTnI (> or =0.3 ng/mL) were detected in 51% and 46% of patients, respectively. These patients were more likely to be inpatients (70% versus 45% for cTnT, 75% versus 43% for cTnI, P<0.05 for both), have a higher plasma creatinine (153 versus 119 micromol/L for cTnT; 157 versus 118 micromol/L for cTnI, P<0.05) and lower plasma sodium (134 versus 138 mmol/L for both, P<0.05). At 12 months, they were more likely to have died or undergone cardiac transplantation (41% versus 14%, P=0.01 for cTnT; 43% versus 15%, P=0.004 for cTnI). After adjustment for New York Heart Association class, plasma sodium and inpatient status, a significant association with events was still evident for both troponins.
  
  
  CONCLUSIONS
  Both cTnT and cTnI are strongly associated with other clinical indicators of HF severity and remain independent predictors of prognosis after adjustment for these factors. These results indicate a potential role for cTnT and cTnI in the clinical management of HF patients.
authors.affiliation: Division of Cardiology, Ottawa Heart Institute and Department of Medicine, University of Ottawa, Ontario, Canada.
authors.forename: Jeffrey S
authors.initials: JS
authors.lastname: Healey
authors.forename: Richard F
authors.initials: RF
authors.lastname: Davies
authors.forename: Stuart J
authors.initials: SJ
authors.lastname: Smith
authors.forename: Ross A
authors.initials: RA
authors.lastname: Davies
authors.forename: Daylily S
authors.initials: DS
authors.lastname: Ooi
mesh_terms: D000368:Aged; D015415:Biomarkers; D018572:Disease-Free Survival; D005260:Female; D006333:Heart Failure / Q000097:blood / Q000175:diagnosis* / Q000401:mortality* / Q000473:pathology / Q000628:therapy; D006801:Humans; D008297:Male; D008875:Middle Aged; D009864:Ontario / Q000453:epidemiology; D010343:Patient Admission; D011237:Predictive Value of Tests; D011379:Prognosis; D011446:Prospective Studies; D012720:Severity of Illness Index; D019210:Troponin I / Q000097:blood*; D020107:Troponin T / Q000097:blood*
chemical_list: D015415:Biomarkers; D019210:Troponin I; D020107:Troponin T