Role of tubular obstruction in acute renal failure due to gentamicin View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

1983-09

AUTHORS

Joel Neugarten, Hagop S. Aynedjian, Norman Bank, N Bank

ABSTRACT

Gentamicin sulfate was administered by intraperitoneal injection to male Sprague-Dawley rats in a dose of 100 to 120 mg/kg/day for 4 to 5 days to induce severe nephrotoxicity. In comparison to controls, inulin clearance was markedly decreased (2.87 +/- 0.31 vs. 8.65 +/- 0.31 ml/min/kg, P less than 0.001) as was urinary osmolality (462 +/- 36 vs. 1196 +/- 46, P less than 0.001). Surface tubules appeared heterogeneous. Some were plugged by whitish debris, whereas others were markedly dilated (I.D. = 41.5 +/- 2 mu). All other tubules were moderately dilated (I.D. = 28.8 vs. 20 mu). The microinfusion of tubules with cellular debris with an isotonic "equilibrium" solution resulted in a rise in intratubular pressure to as high as 60 to 80 mm Hg, compared with 13 to 15 mm Hg in normal rats. In better functioning nephrons, free-flow pressure (FFP) was increased significantly (16.0 +/- 0.5 vs. 10.2 +/- 0.1 mm Hg, P less than 0.001). Paired measurements of single nephron glomerular filtration rate (SNGFR) in these nephrons, made while monitoring intratubular pressure (ITP), revealed a rise in SNGFR when ITP was lowered from the initially high level to 10 mm Hg. Comparable changes in SNGFR were induced in normal rats by varying ITP from 10 to 15 mm Hg. The data suggest that in severe gentamicin nephrotoxicity, many cortical nephrons may be contributing very little to excretory function, presumably because of intratubular obstruction. The less impaired nephrons have reduced SNGFR, due in part to increased free-flow pressure.(ABSTRACT TRUNCATED AT 250 WORDS) More... »

PAGES

330-335

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/ki.1983.162

DOI

http://dx.doi.org/10.1038/ki.1983.162

DIMENSIONS

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PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/6645206


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48 schema:description Gentamicin sulfate was administered by intraperitoneal injection to male Sprague-Dawley rats in a dose of 100 to 120 mg/kg/day for 4 to 5 days to induce severe nephrotoxicity. In comparison to controls, inulin clearance was markedly decreased (2.87 +/- 0.31 vs. 8.65 +/- 0.31 ml/min/kg, P less than 0.001) as was urinary osmolality (462 +/- 36 vs. 1196 +/- 46, P less than 0.001). Surface tubules appeared heterogeneous. Some were plugged by whitish debris, whereas others were markedly dilated (I.D. = 41.5 +/- 2 mu). All other tubules were moderately dilated (I.D. = 28.8 vs. 20 mu). The microinfusion of tubules with cellular debris with an isotonic "equilibrium" solution resulted in a rise in intratubular pressure to as high as 60 to 80 mm Hg, compared with 13 to 15 mm Hg in normal rats. In better functioning nephrons, free-flow pressure (FFP) was increased significantly (16.0 +/- 0.5 vs. 10.2 +/- 0.1 mm Hg, P less than 0.001). Paired measurements of single nephron glomerular filtration rate (SNGFR) in these nephrons, made while monitoring intratubular pressure (ITP), revealed a rise in SNGFR when ITP was lowered from the initially high level to 10 mm Hg. Comparable changes in SNGFR were induced in normal rats by varying ITP from 10 to 15 mm Hg. The data suggest that in severe gentamicin nephrotoxicity, many cortical nephrons may be contributing very little to excretory function, presumably because of intratubular obstruction. The less impaired nephrons have reduced SNGFR, due in part to increased free-flow pressure.(ABSTRACT TRUNCATED AT 250 WORDS)
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