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TITLE:  Use of the double-isotope single-injection method for estimating renal function in normal cross-bred swine
 
AUTHORS:  Mercer HD;Teske RH;Helferich WG;Showalter DH;
 
YEAR:  1979
 
JOURNAL ABBREV:  Am J Vet Res
 
MONTH:  Apr
 
TYPE:  JOUR
 
REFMAN INDEX:  426
 
JOURNAL FULL:  American journal of veterinary research
 
VOLUME:  40
 
ISSUE:  4
 
START PAGE:  567
 
END PAGE:  570
 
KEYWORDS:  administration & dosage;Animals;Cats;diagnostic use;Dogs;Glomerular Filtration Rate;Half-Life;Iodohippuric Acid;Isotope Labeling;Kidney Function Tests;methods;physiology;Sodium;Sodium Isotopes;Swine;
 
ABSTRACT:  The double-isotope single-injection method to estimate renal function which utilizes the radiolabeled chemicals [131I]sodium iodohippurate and [125I]sodium iothalamate was evaluated in swine. A total of 46 normal, cross-bred swine were used to determine the applicability of this method for measuring the glomerular filtration rate and effective renal plasma flow. The mean glomerular filtration rate in pigs was determined to be 5.33 +/- 0.82 ml/kg of body weight/minute for [125I]sodium iothalamate with a biological half-life (T 1/2) of 39.18 +/- 7.44 minutes. The mean effective renal plasma flow was determined to be 19.25 +/- 3.12 ml/kg of body weight/minute for [313I]sodium iodohippurate, with a T 1/2 of 18.45 +/- 1.74 minutes. These values are more closely related to the glomerular filtration and effective renal plasma flow values reported for dogs and cats than they are to values reported for man. The method is rapid and reliable; results are available 6 to 8 hours after the experiment. This method is advantageous when information about renal function variables is a prerequisite to pharmacokinetic or toxicologic studies
 
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