Evaluation of the single-injection plasma disappearance of technetium-99m mercaptoacetyltriglycine method for determination of effective renal plasma flow in dogs with normal or abnormal renal function.

TitleEvaluation of the single-injection plasma disappearance of technetium-99m mercaptoacetyltriglycine method for determination of effective renal plasma flow in dogs with normal or abnormal renal function.
Publication TypeJournal Article
Year of Publication1994
AuthorsItkin RJ, Krawiec DR, Twardock AR, Gelberg HB, Koritz GD
JournalAmerican journal of veterinary research
Volume55
Issue12
Pagination1652-9
Date Published1994 Dec
ISSN0002-9645
KeywordsAnimals, Dog Diseases, Dogs, Erythrocytes, Female, Kidney Function Tests, Male, p-Aminohippuric Acid, Protein Binding, Reference Values, Renal Insufficiency, Renal Plasma Flow, Effective, Technetium Tc 99m Mertiatide
Abstract

Effective renal plasma flow (ERPF) was evaluated, using continuous-infusion p-aminohippurate clearance (CLPAH) and single-injection plasma clearance of technetium-99m mercaptoacetyltriglycine (99mTc-MAG3; CLMAG3) methods. Simultaneous clearance determinations were made in 6 dogs: 2 determinations for each dog before, and 1 determination after renal failure was induced by administration of amphotericin B. Linear regression analysis was used to derive an equation to estimate ERPF from CLMAG3 after the single IV injection. A Student's t-test was used to compare pharmacokinetics between the dogs when they were healthy and when they were in renal failure. An F-test was used to determine the appropriate Student's t-test. Results indicated that CLMAG3 correlated reasonably well (r = 0.83, P < 0.0001) with ERPF obtained from the CLPAH value. The volume of distribution and elimination of 99mTc-MAG3 decreased during renal failure. Although there was minimal binding of 99mTc-MAG3 to erythrocytes, it was significantly (P = 0.0008) lower during renal failure. Protein binding was not significantly different during renal failure. All dogs had signs of nausea and emesis at variable times after injection of 99mTc-MAG3. Determination of CLMAG3 after a single injection provides an adequate means to rapidly assess ERPF in dogs. The technique could easily be performed in dogs with renal disease, thus providing valuable information regarding progression of naturally acquired renal failure.

Alternate JournalAm. J. Vet. Res.