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Effect of ouabain on the renal response to furosemide.

The aim of this work was to investigate whether the natriuretic effect of furosemide can be wholly explained by the inhibition of a ouabain-sensitive Cl transport in the thick ascending limb of Henle. For this purpose 6 dogs undergoing moderate saline diuresis received 100 mug ouabain/kg into the left renal artery followed by 2 mg furosemide/kg IV. Urine was collected from both kidneys and blood samples taken at regular intervals. Ouabain produced a unilateral increase in Na excretion and little change in CCR and water and K excretion. IV furosemide increased Na, K and water excretion in both