Diatrizoate contrast agent study for luminal patency and visualization of the gastrointestinal tract in healthy rabbits (Oryctolagus cuniculus) and its influence on selected blood parameters and fecal quality

Background: The aim of this study was to determine an effective dose of the contrast agent diatrizoate in healthy rabbits. Methods: This study included 14 rabbits receiving three different dosages of a solution containing 300 mg iodine/mL and 600 mg diatrizoate/mL (Dose 1, 2 mL/kg; Dose 2, 7 mL/kg; Dose 3, 10 mL/kg). Full body radiographs were obtained at 0, 15, 30, 45 and 60 minutes, and 12 and 24 hours after oral administration. Blood samples 60 minutes and 24 hours after administration and fecal dry matter after 24 hours were compared to preliminary samples. Results: Recommended doses and times for radiography for luminal patency and visualization of each gastrointestinal segment are given. The evaluated blood parameters were within their respective reference intervals throughout this study. However, significant changes (P < 0.05) could be observed. A decrease in hematocrit at all three doses administered, an increase in urea that persisted for more than 24 hours after administration of 2 mL/kg and 10 mL/kg, and a short-term increase in creatinine after administration of 7 mL/kg could be observed. Glucose and sodium were still increased after administration of 10 mL/kg after 24 hours, while potassium decreased after administration of all three doses. The chloride concentration was still increased after 24 hours after administration of 7 mL/kg. Administration of 7 mL/kg and 10 mL/kg resulted in a significant decrease in the dry matter of feces. Five rabbits developed self-limiting diarrhea after administration of 10 mL/kg. Conclusion and clinical relevance: Diatrizoate is a useful contrast agent in order to assess the passage through the intestine and achieve a good visualization of the gastrointestinal system.