title: Comparison of B-type natriuretic peptide assays for identifying heart failure in stable elderly patients with a clinical diagnosis of chronic obstructive pulmonary disease.
abstract: OBJECTIVE
  To compare the ability of different B-type natriuretic peptide (BNP) assays to identify heart failure in stable elderly patients with a diagnosis of chronic obstructive pulmonary disease (COPD).
  
  
  METHODS
  200 patients aged >or=65 years with COPD according to their general practitioner and without known heart failure, underwent a diagnostic work-up. The final diagnosis of heart failure was established by a panel using the diagnostic principles of the European Society of Cardiology. All available diagnostic results, including echocardiography, but not BNP or NT-proBNP measurements, were used. The ability of different B-type natriuretic peptide assays to identify heart failure was estimated using the area under the receiver operating characteristic curves (ROC-area).
  
  
  RESULTS
  The ROC-areas did not differ significantly between the various assays of NT-proBNP and BNP, and ranged from 0.68 (95%CI 0.60-0.73) to 0.73 (95%CI 0.64-0.81). For NT-proBNP the age- and gender-independent 'optimal' cut-point was 15 pmol/l (125 pg/ml) and for BNP 10 pmol/l (35 pg/ml). All assays were much better at excluding than detecting heart failure.
  
  
  CONCLUSIONS
  All assays of B-type natriuretic peptide showed reasonable and comparable accuracy in recognising heart failure. At 'optimal' cut-points, all assays performed better at excluding than detecting new cases of heart failure in this population.
authors.affiliation: Utrecht Heart Failure Organisation, Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, The Netherlands. F.H.Rutten@umcutrecht.nl <F.H.Rutten@umcutrecht.nl>
authors.forename: Frans H
authors.initials: FH
authors.lastname: Rutten
authors.forename: Maarten-Jan M
authors.initials: MJ
authors.lastname: Cramer
authors.forename: Nicolaas P A
authors.initials: NP
authors.lastname: Zuithoff
authors.forename: Jan-Willem J
authors.initials: JW
authors.lastname: Lammers
authors.forename: Wim
authors.initials: W
authors.lastname: Verweij
authors.forename: Diederick E
authors.initials: DE
authors.lastname: Grobbee
authors.forename: Arno W
authors.initials: AW
authors.lastname: Hoes
mesh_terms: D000368:Aged; D005260:Female; D006333:Heart Failure / Q000097:blood / Q000175:diagnosis*; D006801:Humans; D007118:Immunoassay / Q000379:methods*; D008297:Male; D020097:Natriuretic Peptide, Brain / Q000097:blood*; D010446:Peptide Fragments / Q000097:blood; D011237:Predictive Value of Tests; D029424:Pulmonary Disease, Chronic Obstructive / Q000097:blood / Q000175:diagnosis*; D012016:Reference Values
chemical_list: D010446:Peptide Fragments; C109794:pro-brain natriuretic peptide (1-76); D020097:Natriuretic Peptide, Brain