title: Prevalence and prognostic significance of preprocedural cardiac troponin elevation among patients with stable coronary artery disease undergoing percutaneous coronary intervention: results from the evaluation of drug eluting stents and ischemic events registry.
abstract: BACKGROUND
  Although cardiac troponin (cTn) elevation is associated with periprocedural complications during percutaneous coronary intervention (PCI) in the setting of acute coronary syndromes, the prevalence and prognostic significance of preprocedural cTn elevation among patients with stable coronary artery disease undergoing PCI are unknown.
  
  
  RESULTS
  Between July 2004 and September 2006, 7592 consecutive patients who underwent attempted stent placement at 47 hospitals throughout the United States were enrolled in a prospective multicenter registry. We analyzed the frequency of an elevated cTn immediately before PCI and its relationship to in-hospital and 1-year outcomes among patients who underwent PCI for either stable angina or a positive stress test. Among the stable coronary artery disease population (n=2382, 31.4%), 142 (6.0%) had a cTn level above the upper limit of normal before the procedure. Compared with patients who had normal baseline cTn, patients with elevated cTn had a higher rate of in-hospital death or myocardial infarction (13.4% versus 5.6%; P<0.001) and a trend toward higher rates of urgent repeat PCI (1.4% versus 0.2%; P=0.06). In multivariable analyses adjusted for demographic, clinical, angiographic, and procedural factors, baseline cTn elevation remained independently associated with the composite of death or myocardial infarction at hospital discharge (odds ratio, 2.1; 95% confidence interval, 1.2 to 3.8; P=0.01) and at the 1-year follow-up (odds ratio, 2.0; 95% confidence interval, 1.2 to 3.3; P=0.005).
  
  
  CONCLUSIONS
  Baseline elevation of cTn is relatively common among patients with stable coronary artery disease undergoing PCI and is an independent prognostic indicator of ischemic complications. If these data are confirmed in future studies, consideration should be given to routine testing of cTn before performance of PCI in this patient population.
authors.affiliation: Division of Cardiovascular Medicine, Stony Brook University Medical Center, Stony Brook, NY, USA.
authors.forename: Allen
authors.initials: A
authors.lastname: Jeremias
authors.forename: Neal S
authors.initials: NS
authors.lastname: Kleiman
authors.forename: Deborah
authors.initials: D
authors.lastname: Nassif
authors.forename: Wen-Hua
authors.initials: WH
authors.lastname: Hsieh
authors.forename: Michael
authors.initials: M
authors.lastname: Pencina
authors.forename: Kelly
authors.initials: K
authors.lastname: Maresh
authors.forename: Manish
authors.initials: M
authors.lastname: Parikh
authors.forename: Donald E
authors.initials: DE
authors.lastname: Cutlip
authors.forename: Ron
authors.initials: R
authors.lastname: Waksman
authors.forename: Steven
authors.initials: S
authors.lastname: Goldberg
authors.forename: Peter B
authors.initials: PB
authors.lastname: Berger
authors.forename: David J
authors.initials: DJ
authors.lastname: Cohen
mesh_terms: D000368:Aged; D000787:Angina Pectoris / Q000097:blood / Q000453:epidemiology / Q000628:therapy; D015906:Angioplasty, Balloon, Coronary; D003324:Coronary Artery Disease / Q000097:blood / Q000453:epidemiology / Q000628:therapy; D054855:Drug-Eluting Stents; D006760:Hospitalization / Q000706:statistics & numerical data; D006801:Humans; D007674:Kidney Diseases / Q000453:epidemiology; D008875:Middle Aged; D017202:Myocardial Ischemia / Q000097:blood / Q000453:epidemiology / Q000628:therapy; D011237:Predictive Value of Tests; D015995:Prevalence; D011379:Prognosis; D012042:Registries; D012307:Risk Factors; D016896:Treatment Outcome; D020107:Troponin T / Q000097:blood*
chemical_list: D020107:Troponin T