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Hemodynamic, renal, and hormonal effects of intravenous bolus injection of 50 micrograms synthetic alpha-human atrial natriuretic peptide (alpha-hANP) were studied in eight patients with congestive heart failure. alpha-hANP caused significant reductions in mean blood pressure and systemic vascular resistance. These responses were sustained up to 90 minutes and not accompanied by reflex tachycardia. Cardiac index and stroke volume index increased significantly at 90 minutes and pulmonary capillary wedge pressure, pulmonary arterial pressure, and mean right atrial pressure remained unchanged. Urine volume, urinary sodium excretion, creatinine clearance, and fractional excretion of sodium increased significantly, but fractional excretion of potassium and phosphate did not change. Elevated plasma renin activity, plasma aldosterone, and norepinephrine were suppressed after the injection of alpha-hANP. The bolus injection of this peptide has moderately hypotensive, vasorelaxant, and natriuretic effects in patients with congestive heart failure.
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