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Renal haemodynamics in chronic unilateral ureteral obstruction in the dog.

Renal blood flow and its intrarenal distribution have been investigated after 7 and 14 days of unilateral ureteral ligation (UUL) in both the ligated and the undisturbed kidney by the radioactive microsphere technique without opening the abdomen and the obstructed ureter. It has been found that renal blood flow (RBF) decreased to about 26% after 7 days and to about 10% after 14 days of normal controls in the obstructed kidney. There was a pronounced inward shifting of the much reduced RBF. The slight increase in RBF of the undisturbed kidney was not significant and did not compensate the pronounced decrease of RBF in the obstructed one.