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Antidiuretic hormone and atrial natriuretic peptide in congestive heart failure.

Plasma concentrations of antidiuretic hormone (ADH) were measured in 8 patients with congestive heart failure (CHF) of NYHA functional class III-IV, before and during treatment with captopril, 6.25-25.0 mg t.i.d., added to their drug regimen. Before captopril treatment, plasma ADH was high, 2.5 times the upper limit of normal reference values. During treatment with captopril, plasma ADH levels were normalized, and remained so throughout the study, for at least 6 months. Plasma levels of angiotensin II were also reduced to a normal level. Reduction of plasma ADH during captopril treatment in CHF may partly depend on reduced angiotensin II formation, and may be beneficial by improving water balance. Atrial natriuretic peptide (ANP), was measured by radioimmunoassay in 17 patients with CHF. The highest levels were measured in the most severe CHF cases, and intermediate high values on NYHA functional class I-II patients. Plasma ANP concentrations in control patients (n = 18) without cardiac diseases ranged between 0 and 30 pg/ml. In two patients with paroxysmal supraventricular tachycardia, associated with transient polyuria, high plasma ANP concentrations were noticed during tachycardic episodes. Thus, ANP appears to be a circulating hormone in humans, and is released into the blood in clinical conditions associated with raised preload and atrial wall stretch.