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Scand J Clin Lab Invest. 1982 Feb;42(1):1-8.

Renal function in dogs with chronic moderate unilateral ureteral obstruction.


Partial obstruction of the left ureter was created in seven dogs. Renal function was studied 3 weeks later. Total renal blood flow (RBF) and intrarenal blood flow distribution were studied using the microsphere technique. Glomerular filtration rate (GFR), effective renal plasma flow (CPAH) and the excretion of sodium and osmolar substances were determined using the clearance technique. RBF, GFR and CPAH in the hydronephrotic kidney were reduced to approximately 30% of the same parameters in the contralateral kidney. Urinary sodium excretion was consistently lower in the hydronephrotic than in the contralateral kidney. Volume expansion with isotonic saline solution revealed that this reduction of sodium excretion from the hydronephrotic kidney was out of proportion to the extent of GFR reduction. The contralateral unobstructed kidney did not compensate for this salt retention by increasing its sodium excretion.

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