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  • Title: Renal tubular acidosis in two horses: diagnostic studies.
    Author: Ziemer EL, Parker HR, Carlson GP, Smith BP, Ishizaki G.
    Journal: J Am Vet Med Assoc; 1987 Feb 01; 190(3):289-93. PubMed ID: 3558066.
    Abstract:
    An 11-year-old Quarter Horse mare and a 2-year-old Quarter Horse colt with clinical diagnoses of renal tubular acidosis (RTA) were donated to the University of California Veterinary Medical Teaching Hospital. A series of diagnostic tests was performed in an attempt to characterize the type and cause of RTA in these horses. Endogenous creatinine clearance and sodium sulfanilate clearance were within reference ranges; thus, no abnormality of glomerular function was detected. To assess renal tubular function in response to acid loading, each horse was given 0.1 g of NH4Cl/kg of body weight via nasogastric tube in 6 L of water. Urine acidification in response to the oral acid load was less than that observed in control horses. The urinary clearance ratio for sodium also was found to be greater for the principals than for the controls. These findings supported a diagnosis of RTA that closely resembled type 1 or distal RTA. In an attempt to determine the cause of RTA, renal ultrasonography, renal biopsy, and a mating study were performed. No abnormalities were identified, and the cause of RTA in these cases remained unknown.
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