Abstract
Furosemide and the prostaglandin synthetase inhibitor, indomethacin, were administered singly and in combination to four normal subjects and six patients with essential hypertension in order to determine whether the antihypertensive, natriuretic and other effects of furosemide could be altered by inhibition of prostaglandin synthesis. In all subjects indomethacin treatment alone resulted in a significant elevation of blood pressure and a fall in plasma renin without any change in sodium excretion. Furosemide alone resulted in a significant blood pressure fall with a rise in plasma renin and urinary aldosterone with a marked increase in urinary sodium loss. These effects were either obviated or blunted by addition of indomethacin. The results are compatible with the hypothesis that the antihypertensive and natriuretic effects of furosemide might be mediated at least in part by prostaglandin synthesis. In addition, the effects of indomethacin should be considered when using this drug in hypertensive patients and in subjects requiring diuretic therapy.
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