title: Red cell distribution width: an inexpensive and powerful prognostic marker in heart failure.
abstract: OBJECTIVE
  Red cell distribution width (RDW) is prognostic in patients with heart failure (HF), but it has not been compared with N-terminal brain natriuretic peptide (NT-proBNP). We sought to make this comparison.
  
  
  RESULTS
  Patients referred to a specialist HF clinic between 2001 and 2008 were assessed comprehensively including medical history, echocardiogram, and blood tests. Cox-regression was used to assess the multivariable relationship between RDW, NT-proBNP, and all-cause mortality. A total of 1087 patients were recruited; median (IQR) follow-up was 52 months (29-66); age 72 years (64-78); 74% male; 70% ischaemic heart disease; 20% diabetic; 85% NYHA >or= 2, and 63% with at least moderate LV impairment (EF < 35% equivalent). In a multivariable model, both RDW and NT-proBNP were independently prognostic (RDW: chi(2) = 21.8 vs. 49.1 both P < 0.001). In a model using quartiles of each variable, the relative risk for each was similar for the second and third quartiles compared with the first. A larger increase in risk for NT-proBNP is seen in the fourth quartile.
  
  
  CONCLUSIONS
  Red cell distribution width is a readily available test in the HF-population with similar independent prognostic power to NT-proBNP across the first to third quartiles. Prognostic models in HF should include RDW and further investigation is necessary to determine the pathological mechanism of the relationship.
authors.affiliation: Department of Cardiology, Division of Cardiovascular and Respiratory Studies, Postgraduate Medical Institute, Castle Hill Hospital, Kingston-upon-Hull, East Yorkshire, UK. ys.najjar@gmail.com
authors.forename: Yahya
authors.initials: Y
authors.lastname: Al-Najjar
authors.forename: Kevin M
authors.initials: KM
authors.lastname: Goode
authors.forename: Jufen
authors.initials: J
authors.lastname: Zhang
authors.forename: John G F
authors.initials: JG
authors.lastname: Cleland
authors.forename: Andrew L
authors.initials: AL
authors.lastname: Clark
mesh_terms: D000368:Aged; D004911:Erythrocyte Volume; D005260:Female; D006333:Heart Failure / Q000097:blood* / Q000401:mortality; D006801:Humans; D008297:Male; D008875:Middle Aged; D020097:Natriuretic Peptide, Brain / Q000097:blood; D010446:Peptide Fragments / Q000097:blood; D011379:Prognosis; D015996:Survival Rate
chemical_list: D010446:Peptide Fragments; C109794:pro-brain natriuretic peptide (1-76); D020097:Natriuretic Peptide, Brain