title: The influence of age, sex and other variables on the plasma level of N-terminal pro brain natriuretic peptide in a large sample of the general population.
abstract: OBJECTIVE
  To identify potentially confounding variables for the interpretation of plasma N-terminal pro brain natriuretic peptide (NT-proBNP).
  
  
  METHODS
  Randomly selected subjects filled in a heart failure questionnaire and underwent pulse and blood pressure measurements, ECG, echocardiography, and blood sampling.
  
  
  METHODS
  Subjects were recruited from four Copenhagen general practices located in the same urban area and were examined in a Copenhagen University Hospital.
  
  
  METHODS
  382 women and 290 men in four age groups: 50-59 years (n = 174); 60-69 years (n = 204); 70-79 years (n = 174); and > 80 years (n = 120).
  
  
  METHODS
  Associations between the plasma concentration of NT-proBNP and a range of clinical variables.
  
  
  RESULTS
  In the undivided study sample, female sex (p < 0.0001), greater age (p < 0.0001), increasing dyspnoea (p = 0.0001), diabetes mellitus (p = 0.01), valvar heart disease (p = 0.002), low heart rate (p < 0.0001), left ventricular ejection fraction < or = 45% (p < 0.0001), abnormal ECG (p < 0.0001), high log10[plasma creatinine] (p = 0.0009), low log10[plasma glycosylated haemoglobin A1c] (p = 0.0004), and high log10[urine albumin] (p < 0.0001) were independently associated with a high plasma log10[plasma NT-proBNP] by multiple linear regression analysis.
  
  
  CONCLUSIONS
  A single reference interval for the normal value of NT-proBNP is unlikely to suffice. There are several confounders for the interpretation of a given NT-proBNP concentration and at the very least adjustment should be made for the independent effects of age and sex.
authors.affiliation: Department of Cardiology and Endocrinology, Copenhagen University Hospital Frederiksberg, Frederiksberg, Denmark.
authors.forename: I
authors.initials: I
authors.lastname: Raymond
authors.forename: B A
authors.initials: BA
authors.lastname: Groenning
authors.forename: P R
authors.initials: PR
authors.lastname: Hildebrandt
authors.forename: J C
authors.initials: JC
authors.lastname: Nilsson
authors.forename: M
authors.initials: M
authors.lastname: Baumann
authors.forename: J
authors.initials: J
authors.lastname: Trawinski
authors.forename: F
authors.initials: F
authors.lastname: Pedersen
mesh_terms: D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D015415:Biomarkers / Q000097:blood; D001794:Blood Pressure / Q000502:physiology; D002303:Cardiac Output, Low / Q000175:diagnosis* / Q000503:physiopathology; D003925:Diabetic Angiopathies / Q000175:diagnosis / Q000503:physiopathology; D005260:Female; D006339:Heart Rate / Q000502:physiology; D006801:Humans; D008297:Male; D008875:Middle Aged; D020097:Natriuretic Peptide, Brain; D009419:Nerve Tissue Proteins / Q000097:blood*; D010446:Peptide Fragments / Q000097:blood*; D012737:Sex Factors; D011795:Surveys and Questionnaires; D014504:Urban Health
chemical_list: D015415:Biomarkers; D009419:Nerve Tissue Proteins; D010446:Peptide Fragments; C109794:pro-brain natriuretic peptide (1-76); D020097:Natriuretic Peptide, Brain