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Objective—To determine an optimal dose of carbon 13 (13C)-labeled aminopyrine for use in a 13C-aminopyrine demethylation blood test in healthy dogs.

Animals—9 adult dogs.

Procedures—Food was withheld from each dog for 12 hours. A 2-mL baseline blood sample was obtained from each dog and placed into an evacuated tube containing sodium heparin. Carbon 13-labeled aminopyrine was administered IV at doses of 1, 2, 5, or 10 mg/kg. Additional blood samples (2 mL) were obtained and placed into evacuated tubes containing sodium heparin 30, 45, 60, and 75 minutes after 13C-aminopyrine administration. Hydrochloric acid was used to extract CO2 from blood samples. The extracted gas was analyzed by fractional mass spectrometry to determine the percentage dose of 13C administered as 13C-aminopyrine and recovered in extracted gas (PCD).

Results—Gross evidence of clinical adverse effects was not detected in any dog after administration of 13C-aminopyrine. The mean coefficient of variation (CV) for PCD was significantly lower than the mean CV for the summation of PCD values up to a given sampling time (CUMPCD). Mean PCD values among the 4 doses for each sample time were not significantly different. Administration of 13C-aminopyrine at a dose of 2 mg/kg resulted in the lowest interindividual variability.

Conclusions and Clinical Relevance—The PCD is superior to CUMPCD for the quantification of aminopyrine demethylation. Administration of 13C-13C-aminopyrine at a dose of 2 mg/kg is appropriate for use in the 13C-aminopyrine demethylation blood test in healthy dogs.

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in American Journal of Veterinary Research