title: Cardiac production of C-type natriuretic peptide in heart failure.
abstract: BACKGROUND
  C-type natriuretic peptide production by the heart in patients with chronic heart failure has recently been demonstrated by measuring the difference in C-type natriuretic peptide plasma levels between the aortic root and coronary sinus samples. To assess this previous relevant observation, we re-evaluated the cardiac production of C-type natriuretic peptide, thus increasing the total number of patients studied. In light of the difficulty in recruiting patients with these characteristics, this kind of study can be performed with a small number of subjects.
  
  
  METHODS
  Cardiac production of C-type natriuretic peptide was evaluated in a subset (n = 6) of patients, referred to our institute for the evaluation of chronic heart failure. C-type natriuretic peptide was measured in the coronary sinus and in aorta blood collected during right and left heart catheterization using a specific immunometric assay, after solid-phase extraction of plasma samples.
  
  
  RESULTS
  Significantly higher C-type natriuretic peptide levels were found in the coronary sinus than in aorta blood (7.8 +/- 1.3 versus 6.1 +/- 1.5 pg/ml, P = 0.034) and our results were in accordance with previous ones. Analysing as a whole the data gathered in the two studies, a noteworthy significant increase was observed (n = 15, P = 0.002) between the C-type natriuretic peptide concentrations in the two sites.
  
  
  CONCLUSIONS
  The results of the present study strengthen the hypothesis that C-type natriuretic peptide is produced by the heart in patients with chronic heart failure.
authors.affiliation: Institute of Clinical Physiology, National Research Council, Pisa, Italy.
authors.forename: Silvia
authors.initials: S
authors.lastname: Del Ry
authors.forename: Maristella
authors.initials: M
authors.lastname: Maltinti
authors.forename: Marcello
authors.initials: M
authors.lastname: Piacenti
authors.forename: Claudio
authors.initials: C
authors.lastname: Passino
authors.forename: Michele
authors.initials: M
authors.lastname: Emdin
authors.forename: Daniela
authors.initials: D
authors.lastname: Giannessi
mesh_terms: D000368:Aged; D005260:Female; D006333:Heart Failure / Q000378:metabolism*; D006801:Humans; D008297:Male; D008875:Middle Aged; D020098:Natriuretic Peptide, C-Type / Q000097:blood / Q000378:metabolism*; D011863:Radioimmunoassay
chemical_list: D020098:Natriuretic Peptide, C-Type