Effect of frusemide on atrial natriuretic peptide, guanosine cyclic monophosphate, angiotensin II, aldosterone, vasopressin, prostaglandin E2 and blood volume in the nephrotic syndrome.

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Blood volume, plasma concentrations of atrial natriuretic peptide, guanosine cyclic monophosphate (cGMP), angiotensin II, aldosterone and arginine vasopressin, and urinary excretion rate of prostaglandin E2, cGMP, sodium, and water were determined before and after intravenous administration of frusemide 0.75 mg/kg body-weight in nine patients with the nephrotic syndrome and 15 control subjects. The decrease in blood volume and the increase in urinary sodium and water excretion after fusemide were significantly reduced in the nephrotic patients compared with the controls. Atrial natriuretic peptide was reduced after frusemide both in patients (6.2 to 4.9 pmol/l, medians, P less than 0.05) and controls (5.9 to 4.8 pmol/l, P less than 0.01), but the nadir was delayed in the patients, and cGMP in plasma and urine was reduced only in the controls. The angiotensin II increase was delayed in the patients and aldosterone increased only in the controls. Basal urinary excretion of prostaglandin E2 was less in the nephrotic patients than in the controls (P less than 0.05), but after frusemide the prostaglandin E2 excretion rate increased in the patients (0.25 to 0.62 pmol/min, P less than 0.05), but not in the controls (0.46 to 0.39 pmol/min). In conclusion, reduced water and sodium excretion after frusemide in the nephrotic syndrome is accompanied by a diminished reduction of blood volume, a delayed decrease in atrial natriuretic peptide, and a blunted increase in angiotensin II and aldosterone compared with healthy subjects. Sodium excretion after frusemide may be more dependent on PGE2 production in nephrotic patients than in healthy subjects.