title: Comparison of brain natriuretic peptide and probrain natriuretic peptide in the diagnosis of cardiogenic pulmonary edema in patients aged 65 and older.
abstract: OBJECTIVE
  Differentiating cardiogenic pulmonary edema (CPE) from respiratory causes of dyspnea is difficult in elderly patients. The aim of this study was to compare the usefulness of B-type natriuretic peptide (BNP) and amino-terminal fragment BNP (proBNP), to diagnose CPE in patients aged 65 and older.
  
  
  METHODS
  Prospective study.
  
  
  METHODS
  Medical emergency department of a 2,000-bed urban teaching hospital.
  
  
  METHODS
  Patients aged 65 and older presenting with acute dyspnea and a respiratory rate of 25 breaths/min or greater, a partial pressure of oxygen of 70 mmHg or less, or an oxygen saturation of 92% or less were included.
  
  
  METHODS
  Rapid BNP and proBNP assays, performed blind at admission, were compared with the final diagnosis (CPE or no CPE) as defined by an expert team.
  
  
  RESULTS
  Two hundred two patients (mean age+/-standard deviation 80+/-9) were included; 88 (44%) had CPE. There was a strong correlation between proBNP and BNP values (correlation coefficient=0.91, P<.001). The median BNP and proBNP were higher in the group of patients with CPE (377 vs 74 pg/mL, P<.001, and 3,851 vs 495 pg/mL, P<.001, respectively). The best threshold values of BNP and proBNP were 250 pg/mL and 1,500 pg/mL, respectively. The area under the receiver operating characteristic curve was greater with BNP than with proBNP (0.85 vs 0.80, P<.05). BNP assay was more accurate in diagnosis than the emergency physician, whereas proBNP was not. Higher values of BNP and proBNP were associated with greater in-hospital mortality.
  
  
  CONCLUSIONS
  BNP assay is a more useful diagnostic indicator for CPE than proBNP in patients aged 65 and older.
authors.affiliation: Department of Emergency Medicine and Surgery, Center Hospitalo-Universitaire, Pitié-Salpêtrière, Assistance-Publique Hôpitaux de Paris, Université Pierre et Marie Curie, 47-83 boulevard de l'hôpital, 75013 Paris, France. patrick.ray@psl.ap-hop-paris.fr
authors.forename: Patrick
authors.initials: P
authors.lastname: Ray
authors.forename: Martine
authors.initials: M
authors.lastname: Arthaud
authors.forename: Sophie
authors.initials: S
authors.lastname: Birolleau
authors.forename: Richard
authors.initials: R
authors.lastname: Isnard
authors.forename: Yannick
authors.initials: Y
authors.lastname: Lefort
authors.forename: Jacques
authors.initials: J
authors.lastname: Boddaert
authors.forename: Bruno
authors.initials: B
authors.lastname: Riou
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D015415:Biomarkers; D016022:Case-Control Studies; D005260:Female; D006333:Heart Failure / Q000150:complications*; D006801:Humans; D008297:Male; D020097:Natriuretic Peptide, Brain / Q000097:blood*; D009419:Nerve Tissue Proteins / Q000097:blood*; D010446:Peptide Fragments / Q000097:blood*; D011446:Prospective Studies; D011654:Pulmonary Edema / Q000175:diagnosis* / Q000209:etiology; D012372:ROC Curve; D012680:Sensitivity and Specificity
chemical_list: D015415:Biomarkers; D009419:Nerve Tissue Proteins; D010446:Peptide Fragments; C109794:pro-brain natriuretic peptide (1-76); D020097:Natriuretic Peptide, Brain