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. 1972 Mar;51(3):625–637. doi: 10.1172/JCI106852

A Micropuncture Study of Postobstructive Diuresis in the Rat

William E Yarger 1, Hagop S Aynedjian 1, Norman Bank 1
PMCID: PMC302169  PMID: 5011104

Abstract

In order to investigate the syndrome of postobstructive diuresis, clearance and micropuncture studies were carried out in rats after relief of 24 hr of bilateral (BUL) or unilateral (UUL) ureteral ligation. In rats with BUL, a striking diuresis and natriuresis occurred when the obstruction to one kidney (the experimental kidney) was relieved. The results were not influenced by administration of vasopressin or d-aldosterone. Whole kidney clearances of inulin and p-aminohippuric acid (PAH) in the experimental kidney were reduced to 10% and 20% of normal, respectively. Superficial nephron inulin and PAH clearances were also reduced, but only to 40% and 45%, respectively. These findings suggest a heterogeneity of nephron function in which deep nephrons were functioning poorly or not at all. To investigate the site of impaired tubular reabsorption in the surface nephrons, absolute and fractional water reabsorption was measured. Absolute reabsorption was found to be decreased all along the nephron. Fractional reabsorption in proximal tubules was normal, as indicated by an average endproximal tubular fluid per plasma inulin (TF/PIn) of 2.16 vs. 2.30 in controls. TF/PIn was markedly decreased in distal tubules (2.91 vs. 8.02) and final urine (5.56 vs. 263). These observations indicate that the major sites of impaired sodium reabsorption leading to the diuresis were beyond the proximal tubule.

Rats with 24 hr of UUL did not demonstrate a comparable natriuresis or diuresis either spontaneously when the obstruction was relieved or after i.v. infusion of urea. A major difference between the BUL and UUL rats was that prerelease intrarenal hydrostatic pressure was markedly elevated (30.1 mm Hg) in the former but was below normal free-flow values (9.2 mm Hg) in the latter. Thus, elevation of intrarenal pressure during the period of obstruction may be causally related to the natriuresis and diuresis which occurs after the obstruction is relieved.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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