title: The value of procalcitonin, a novel inflammatory marker, in the diagnosis of myocardial infarction and evaluation of acute coronary syndrome patients.
abstract: BACKGROUND
  Procalcitonin is a calcitonin precursor that is used as an inflammatory biomarker in the plasma of patients with sepsis.
  
  
  OBJECTIVE
  The aim of this study was to determine the diagnostic accuracy of emergency department (ED) point-of-care blood procalcitonin testing in identifying myocardial infarction (MI) in patients with chest pain of presumed ischemic origin.
  
  
  METHODS
  Patients over 18 years of age who presented to the ED with MI-typical chest pain of presumed ischemic origin were included in the study. An initial point-of-care blood sample was drawn from each study patient for testing procalcitonin, troponin T, myoglobin, and creatine kinase-MB levels. A second sample was taken 4h after admission for a procalcitonin test. Finally, a 6-h post-admission blood sample was taken to measure troponin T, myoglobin, and creatine kinase-MB levels in each study patient who had an initial negative cardiac marker test.
  
  
  RESULTS
  A total of 1008 patients with chest pain were admitted to the ED during the study period, and a total of 141 patients met study criteria and were entered into the study. ED point-of-care blood procalcitonin testing to identify myocardial infarction in patients with chest pain of presumed ischemic origin had a sensitivity of 38.3% (95% confidence interval [CI] 28.8-47.3%) and a specificity of 77.8% (95% CI 70.0-84.4%), a positive likelihood ratio (LR+) of 1.725 and a negative likelihood ratio (LR-) of 0.792. The 4th hour diagnostic values (sensitivity, specificity, LR+ and LR-) of procalcitonin semi-quantitative (PCT-Q) testing were 90% (95% CI 80.9-95.7%), 59.3% (95% CI 52.5-63.5%), 2.2, and 0.16, respectively.
  
  
  CONCLUSIONS
  ED point-of-care testing for procalcitonin had poor diagnostic accuracy for predicting myocardial infarction.
authors.affiliation: Department of Emergency Medicine, Akdeniz University Faculty of Medicine, Antalya, Turkey.
authors.forename: Firat
authors.initials: F
authors.lastname: Bektas
authors.forename: Secgin
authors.initials: S
authors.lastname: Soyuncu
authors.forename: Ilker
authors.initials: I
authors.lastname: Gunduz
authors.forename: Ibrahim
authors.initials: I
authors.lastname: Basarici
authors.forename: Halide
authors.initials: H
authors.lastname: Akbas
authors.forename: Cenker
authors.initials: C
authors.lastname: Eken
mesh_terms: D054058:Acute Coronary Syndrome / Q000175:diagnosis*; D000328:Adult; D000368:Aged; D015415:Biomarkers / Q000097:blood; D002116:Calcitonin / Q000097:blood*; D015740:Calcitonin Gene-Related Peptide; D002637:Chest Pain / Q000175:diagnosis; D004636:Emergency Service, Hospital; D005260:Female; D006801:Humans; D007249:Inflammation / Q000097:blood; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000175:diagnosis*; D019095:Point-of-Care Systems / Q000592:standards; D011446:Prospective Studies; D011498:Protein Precursors / Q000097:blood*; D012680:Sensitivity and Specificity
chemical_list: D015415:Biomarkers; C000606589:CALCA protein, human; D011498:Protein Precursors; D002116:Calcitonin; D015740:Calcitonin Gene-Related Peptide