title: C-type natriuretic peptide levels in cor pulmonale and in congestive heart failure.
abstract: BACKGROUND
  C-type natriuretic peptide (CNP) is a recent addition to the family of natriuretic peptides which includes atrial natriuretic peptide (ANP) and brain natriuretic peptide (BNP). Whilst the levels of ANP and BNP are increased in conditions such as congestive heart failure and cor pulmonale, abnormal levels of CNP in these conditions have not been reported.
  
  
  METHODS
  Plasma levels of CNP were measured by specific radioimmunoassay in 12 young normal controls, 12 elderly normal controls, 12 patients with NYHA grade III-IV congestive heart failure, and in 16 patients with hypoxaemic cor pulmonale.
  
  
  RESULTS
  Mean (SE) plasma levels of CNP were similar in young normal controls (0.46(0.03) pmol/l), elderly normal controls (0.43(0.05) pmol/l), and in patients with congestive heart failure (0.33(0.2) pmol/l). In patients with cor pulmonale, however, plasma levels of CNP were raised (1.39(0.27) pmol/l) 3.2-fold compared with age-matched controls.
  
  
  CONCLUSIONS
  In cor pulmonale the increased plasma levels of CNP were not as great as the previously observed increases in levels of ANP (5.6-fold) or BNP (18.5-fold) in comparable patients. CNP may therefore be less important than ANP or BNP as a circulating counter-regulatory peptide in conditions of overactivity of the renin angiotensin system.
authors.affiliation: Department of Clinical Pharmacology, Ninewells Hospital and Medical School, Dundee, UK.
authors.forename: R I
authors.initials: RI
authors.lastname: Cargill
authors.forename: C S
authors.initials: CS
authors.lastname: Barr
authors.forename: W J
authors.initials: WJ
authors.lastname: Coutie
authors.forename: A D
authors.initials: AD
authors.lastname: Struthers
authors.forename: B J
authors.initials: BJ
authors.lastname: Lipworth
mesh_terms: D000328:Adult; D000368:Aged; D009320:Atrial Natriuretic Factor; D005260:Female; D006333:Heart Failure / Q000097:blood*; D006801:Humans; D008297:Male; D020098:Natriuretic Peptide, C-Type; D011506:Proteins / Q000032:analysis*; D011660:Pulmonary Heart Disease / Q000097:blood*; D011863:Radioimmunoassay
chemical_list: D011506:Proteins; D020098:Natriuretic Peptide, C-Type; D009320:Atrial Natriuretic Factor