title: Role of biomarkers in assessment of early infarct size after successful p-PCI for STEMI.
abstract: OBJECTIVE
  The aim of the study was to find out if single time point and estimated cumulative release of cardiac troponin T (cTnT) and creatine kinase (CK) correlate with early infarct size and left ventricular function measured by cardiac magnetic resonance (CMR).
  
  
  METHODS
  CMR and serial CK and cTnT measurements were performed in 103 patients (85 male, mean age 55.8 ± 12.1 years) within at least 8 days (3.1 ± 1.5 days) after first acute myocardial infarction and successful primary percutaneous coronary interventions. Infarct size was determined on delayed gadolinium-enhanced phase-sensitive IR-SSFP CMR sequences. Single time point, peak and cumulative cardiac protein release were correlated with infarct size.
  
  
  RESULTS
  All single time point, peak and estimated cumulative release of CK and cTnT values except on admission showed significant correlations with infarct size. Among single time point values, cTnT after 96 h (cTnT(96); r = 0.680, p < 0.001) and CK after 24 h (CK(24); r = 0.699, p < 0.001) showed the closest correlations with infarct size. Peak CK and cTnT levels correlated only slightly better than single time point values (r = 0.703 and 0.688, p < 0.001), whereas cumulative release values did not show closer correlations than single point values. Receiver-operator characteristics analysis showed that cTnT(96) and CK(24) detected large infarct areas (>16.8 g) and decreased left ventricular function (EF < 40%) with high sensitivity and specificity.
  
  
  CONCLUSIONS
  Both single time point cTnT concentrations and CK activities correlate well with infarct size early after primary PCI for STEMI. Cardiac TnT levels determined 3-4 days after revascularization for acute myocardial infarction allow for a good estimation of acute infarct size as well as an approximation of LV function and morphology.
authors.affiliation: University Clinic of Internal Medicine III, Medical University Innsbruck, Anichstrasse 35, 6020 Innsbruck, Austria.
authors.forename: Gert
authors.initials: G
authors.lastname: Klug
authors.forename: Agnes
authors.initials: A
authors.lastname: Mayr
authors.forename: Johannes
authors.initials: J
authors.lastname: Mair
authors.forename: Michael
authors.initials: M
authors.lastname: Schocke
authors.forename: Michael
authors.initials: M
authors.lastname: Nocker
authors.forename: Thomas
authors.initials: T
authors.lastname: Trieb
authors.forename: Werner
authors.initials: W
authors.lastname: Jaschke
authors.forename: Otmar
authors.initials: O
authors.lastname: Pachinger
authors.forename: Bernhard
authors.initials: B
authors.lastname: Metzler
mesh_terms: D000328:Adult; D000368:Aged; D015906:Angioplasty, Balloon, Coronary; D015415:Biomarkers / Q000097:blood*; D003402:Creatine Kinase / Q000097:blood*; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000097:blood* / Q000175:diagnosis / Q000628:therapy*; D009206:Myocardium / Q000473:pathology; D019210:Troponin I / Q000097:blood*; D016277:Ventricular Function, Left
chemical_list: D015415:Biomarkers; D019210:Troponin I; D003402:Creatine Kinase