The acutely reduced kidney

Allison, Marjorie E. M.; Lipham, Eleanor M.; Lassiter, William E.; Gottschai.K, Carl W.
January 1973
Kidney International;Jan1973, Vol. 3 Issue 1, p354
Academic Journal
The mechanism whereby the kidney maintains water and electrolyte excretion immediately after partial infarction was studied in the uninephrectomized rat. Clearance and micropuncture studies were made fur 2½ hr before and immediately after loss of approximately 60% of the functioning renal mass as produced by tying one or two branches of the renal artery. Qualitatively similar responses were seen in all animals, although urine flow rate, GFR, RPF and electrolyte excretion tended to he higher in those animals given intravenous lissamine green than in those infused with aldosterone and ADH. Total kidney GFR and RPF fell in proportion to the degree of infarction. Mean urine flow rate, however, was unchanged, and there was an immediate rise in the flow rate in surviving nephrons, maximal after one hour. This was due to a fall in proximal fractional reabsorption, absolute reabsorption in the proximal convolution remaining unchanged. There was no evidence that changes in hydrostatic or oncotic pressures within the proximal tubules or peritubular capillaries were important in this response. The role of the interstitial fluid pressure remains unknown.


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