Hutcheon, Duncan E.; Sandhu, Randhir
October 1976
Angiology;Oct1976, Vol. 27 Issue 10, p579
Academic Journal
Changes in arterial blood pressure, renal electrolyte excretion, and plasma renin activity in response to repeated doses of furosemide were measured in 12 patients with essential hypertension admitted to the medical service for electrolyte balance studies. Eighty and 120 mg/day furosemide in divided doses for 5 to 10 days produced a prompt increase in renal sodium excretion. Urinary Na/K concentration ratios, which were elevated during peak natriuresis, returned to control levels following the initial diuretic response. In 2 patients with high initial levels of plasma renin activity, arterial blood pressure was not reduced by furosemide, and more potent antihypertensive agents were required to control the blood pressure. In the remaining patients, furosemide produced a significant decrease in systolic and diastolic blood pressure. There was a general upward shift of plasma renin levels in terms of 24-hour renal sodium excretion in those who demonstrated an antihypertensive response to the drug. However, the average increase in plasma renin activity after repeated doses of furosemide was not statistically significant and no correlation was demonstrated between the level of plasma renin activity after furosemide and the blood pressure lowering effect of the drug.


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