[Cardiac peptides and their importance in heart failure].

Atrial natriuretic peptide (ANP) exhibits a favorable pharmacological profile in heart failure. In reduces preload and afterload by its natriuretic and vasodilatatory actions. Furthermore, it reduces the activity of the renin aldosterone system. This peptide is activated in early heart failure. Plasma levels of 1-28-hANP are elevated and they correlate with the clinical stage of heart failure, as well as with hemodynamic abnormalities. However, the efficacy of this cardiac hormone in heart failure is limited by renal resistance. Possible mechanisms are a reduced renal perfusion pressure, a receptor down-regulation or an overactivity of sodium-retaining hormones like the renin aldosterone system, and the sympathetic activity. The brain natriuretic peptide (BNP) is also stimulated in heart failure; however, its role in the pathophysiology of heart failure remains to be determined.