title: High-sensitivity cardiac troponin in the distinction of acute myocardial infarction from acute cardiac noncoronary artery disease.
abstract: BACKGROUND
  We hypothesized that high-sensitivity cardiac troponin (hs-cTn) and its early change are useful in distinguishing acute myocardial infarction (AMI) from acute cardiac noncoronary artery disease.
  
  
  RESULTS
  In a prospective, international multicenter study, hs-cTn was measured with 3 assays (hs-cTnT, Roche Diagnostics; hs-cTnI, Beckman-Coulter; hs-cTnI Siemens) in a blinded fashion at presentation and serially thereafter in 887 unselected patients with acute chest pain. Accuracy of the combination of presentation values with serial changes was compared against a final diagnosis adjudicated by 2 independent cardiologists. AMI was the adjudicated final diagnosis in 127 patients (15%); cardiac noncoronary artery disease, in 124 (14%). Patients with AMI had higher median presentation values of hs-cTnT (0.113 μg/L [interquartile range, 0.049-0.246 μg/L] versus 0.012 μg/L [interquartile range, 0.006-0.034 μg/L]; P<0.001) and higher absolute changes in hs-cTnT in the first hour (0.019 μg/L [interquartile range, 0.007-0.067 μg/L] versus 0.001 μg/L [interquartile range, 0-0.003 μg/L]; P<0.001) than patients with cardiac noncoronary artery disease. Similar findings were obtained with the hs-cTnI assays. Adding changes of hs-cTn in the first hour to its presentation value yielded a diagnostic accuracy for AMI as quantified by the area under the receiver-operating characteristics curve of 0.94 for hs-cTnT (0.92 for both hs-cTnI assays). Algorithms using ST-elevation, presentation values, and changes in hs-cTn in the first hour accurately separated patients with AMI and those with cardiac noncoronary artery disease. These findings were confirmed when the final diagnosis was readjudicated with the use of hs-cTnT values and validated in an independent validation cohort.
  
  
  CONCLUSIONS
  The combined use of hs-cTn at presentation and its early absolute change excellently discriminates between patients with AMI and those with cardiac noncoronary artery disease.
  
  
  BACKGROUND
  URL: http://www.clinicaltrials.gov. Unique identifier: NCT00470587.
authors.affiliation: Department of Internal Medicine, University Hospital Basel, Basel, Switzerland.
authors.forename: Philip
authors.initials: P
authors.lastname: Haaf
authors.forename: Beatrice
authors.initials: B
authors.lastname: Drexler
authors.forename: Tobias
authors.initials: T
authors.lastname: Reichlin
authors.forename: Raphael
authors.initials: R
authors.lastname: Twerenbold
authors.forename: Miriam
authors.initials: M
authors.lastname: Reiter
authors.forename: Julia
authors.initials: J
authors.lastname: Meissner
authors.forename: Nora
authors.initials: N
authors.lastname: Schaub
authors.forename: Claudia
authors.initials: C
authors.lastname: Stelzig
authors.forename: Michael
authors.initials: M
authors.lastname: Freese
authors.forename: Amely
authors.initials: A
authors.lastname: Heinzelmann
authors.forename: Christophe
authors.initials: C
authors.lastname: Meune
authors.forename: Cathrin
authors.initials: C
authors.lastname: Balmelli
authors.forename: Heike
authors.initials: H
authors.lastname: Freidank
authors.forename: Katrin
authors.initials: K
authors.lastname: Winkler
authors.forename: Kris
authors.initials: K
authors.lastname: Denhaerynck
authors.forename: Willibald
authors.initials: W
authors.lastname: Hochholzer
authors.forename: Stefan
authors.initials: S
authors.lastname: Osswald
authors.forename: Christian
authors.initials: C
authors.lastname: Mueller
mesh_terms: D000208:Acute Disease; D000368:Aged; D000369:Aged, 80 and over; D015415:Biomarkers / Q000097:blood; D003324:Coronary Artery Disease / Q000097:blood* / Q000175:diagnosis*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000097:blood* / Q000175:diagnosis*; D011446:Prospective Studies; D012189:Retrospective Studies; D016037:Single-Blind Method; D020107:Troponin T / Q000097:blood*
chemical_list: D015415:Biomarkers; D020107:Troponin T