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Objective—To evaluate the correlation between halftime of liquid-phase gastric emptying (T50), determined with nuclear scintigraphy using technetium Tc 99m pentetate, and absorption variables of orally administered acetaminophen.

Animals—6 mature horses.

Procedure—Technetium Tc 99m pentetate (10 mCi) and acetaminophen (20 mg/kg of body weight) were administered simultaneously in 200 ml of water. Serial left and right lateral images of the stomach region were obtained with a gamma camera, and T50 determined separately for counts obtained from the left side, the right side and the geometric mean. Power exponential curves were used for estimation of T50 and modified R2 values for estimation of goodness of fit of the data. Serial serum samples were taken, and acetaminophen concentration was determined, using fluorescence polarization immunoassay. Maximum serum concentration (Cmax), time to reach maximum serum concentration (Tmax), area under the curve for 240 minutes and the absorption constant (Ka) were determined, using a parameter estimation program. Correlations were calculated, using the Spearman rank correlation coefficient.

Results—Correlations between T50 and Tmax and between T50 and Ka were significant.

Conclusions and Clinical Relevance—Tmax and Ka are valuable variables in the assessment of liquidphase gastric emptying using acetaminophen absorption. Acetaminophen absorption may be a valuable alternative to nuclear scintigraphy in the determination of gastric emptying rates in equine patients with normally functioning small intestine. (Am J Vet Res 2000;61:310–315)

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in American Journal of Veterinary Research


Objective—To establish a model for inheritance of gluten-sensitive enteropathy (GSE) in Irish Setters.

Animals—44 dogs of a 6-generation family of Irish Setters with GSE and 7 healthy Irish Setters.

Procedure—Phenotype of each dog was determined after oral administration of gluten in the weaning diet, using morphometric evaluation of jejunal biopsies (all generations) and measurement of small intestinal permeability by use of a lactulose-rhamnose permeation test (generations 1, 2, and 3). Overall probability for each of 4 genetic models of inheritance (autosomal recessive, autosomal dominant, sex-linked recessive, and sex-linked dominant) accounting for segregation of partial villus atrophy within the entire family was calculated.

Results—The autosomal recessive model was most tenable and was 56,250 times more likely to account for segregation of partial villus atrophy than the autosomal dominant model, assuming disease prevalence of 0.8%. Both sex-linked models were untenable. These conclusions were robust to the error attached to estimation of disease prevalence. High intestinal permeability without morphometric jejunal abnormalities in 4 of 20 dogs in the 3 youngest generations suggested heterogeneity of lesions associated with GSE.

Conclusions—Genetic transmission of GSE is under the control of a single major autosomal recessive locus. (Am J Vet Res 2000;61:462–468)

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in American Journal of Veterinary Research