title: Comparison of the prognostic value of peak creatine kinase-MB and troponin levels among patients with acute myocardial infarction: a report from the Acute Coronary Treatment and Intervention Outcomes Network Registry-get with the guidelines.
abstract: BACKGROUND
  Although peak creatine kinase-myocardial band (CK-MB) and troponin levels have been correlated with mortality among patients with acute myocardial infarction (AMI), the independent prognostic implications of these markers have not been compared.
  
  
  OBJECTIVE
  We hypothesized that in patients with AMI, peak troponin levels (as compared to peak CK-MB levels) would have greater prognostic value.
  
  
  METHODS
  We examined AMI patients in the National Cardiovascular Data Registry ACTION Registry-GWTG (Acute Coronary Treatment and Intervention Outcomes Network Registry-Get With The Guidelines) with CK-MB and troponin I levels recorded, excluding patients who were transferred in or out. Peak marker levels, standardized by the local laboratory upper limit of normal and assay standard deviation, were fitted into the previously validated ACTION Registry-GWTG mortality model to compare prognostic value.
  
  
  RESULTS
  Between January 2007 and March 2009, 16 009 ST-segment elevation myocardial infarction (STEMI) and 26854 non-ST-segment elevation myocardial infarction (NSTEMI) patients were identified. Peak marker ratios were directly associated with in-hospital mortality in both STEMI and NSTEMI patients. Peak CK-MB had slightly greater discrimination compared with peak troponin I in predicting mortality in both STEMI (model C-statistic 0.881 vs 0.877, P = 0.011) and NSTEMI (C-statistic 0.831 vs 0.824, P = 0.001) patients.
  
  
  CONCLUSIONS
  Both peak CK-MB and peak troponin I levels are independently associated with in-hospital mortality in this large contemporary database of AMI patients treated in routine practice. Peak marker values slightly improved model performance in prognosticating in-hospital mortality; the incremental value was higher with CK-MB than with troponin I. These findings may help to guide future risk stratification algorithms and contribute to more efficient use of serial cardiac marker measurements in clinical practice.
authors.affiliation: Duke Clinical Research Institute, Duke University Medical Center, Durham, North Carolina, USA.
authors.forename: Chee Tang
authors.initials: CT
authors.lastname: Chin
authors.forename: Tracy Y
authors.initials: TY
authors.lastname: Wang
authors.forename: Shuang
authors.initials: S
authors.lastname: Li
authors.forename: Stephen D
authors.initials: SD
authors.lastname: Wiviott
authors.forename: James A
authors.initials: JA
authors.lastname: deLemos
authors.forename: Michael C
authors.initials: MC
authors.lastname: Kontos
authors.forename: Eric D
authors.initials: ED
authors.lastname: Peterson
authors.forename: Matthew T
authors.initials: MT
authors.lastname: Roe
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D015415:Biomarkers / Q000097:blood; D016009:Chi-Square Distribution; D052279:Creatine Kinase, MB Form / Q000097:blood*; D005260:Female; D019983:Guideline Adherence / Q000592:standards*; D017052:Hospital Mortality; D006801:Humans; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000097:blood / Q000175:diagnosis* / Q000401:mortality / Q000628:therapy; D017410:Practice Guidelines as Topic / Q000592:standards*; D010818:Practice Patterns, Physicians' / Q000592:standards*; D011237:Predictive Value of Tests; D011379:Prognosis; D012042:Registries; D012189:Retrospective Studies; D018570:Risk Assessment; D012307:Risk Factors; D019210:Troponin I / Q000097:blood*; D014481:United States
chemical_list: D015415:Biomarkers; D019210:Troponin I; D052279:Creatine Kinase, MB Form