title: The renal excretion of iodine following oral administration of Gastrografin to domestic cats.
abstract: Serum and urinary levels of iodine were determined in six cats before and after oral administration of Gastrografin. Iodine was identified by gamma spectrometry after the specimens had been subjected to neutron activation. Peak serum iodine levels, compared to undetectable preadministration levels in five of the six cats, ranged from 8.0 to 50.7 micrograms/ml 1 to 2 hours after Gastrografin administration. Twenty-four hour cumulative urinary excretion of iodine represented 0.9 to 4.08% of this element calculated to be in Gastrografin. Pharmacokinetic analysis of the serum concentrations using the one-compartment open model resulted in an estimate of ka, the fraction of Gastrografin dose absorbed per unit time, of 2.24 hr-1 (95% CL = -5.4, 7.7) and an estimate of ke, the fraction of the dose eliminated per unit time, of 0.10 hr-1 (95 % CL = -0.01, 0.21). Analysis of urinary elimination rates also yielded ke = 0.10 hr-1 (95% CL = 0.01, 0.18). At necropsy the gastrointestinal tract of each cat was normal.
mesh_terms: D000284:Administration, Oral; D000818:Animals; D002415:Cats; D003973:Diatrizoate / Q000031:analogs & derivatives*; D003974:Diatrizoate Meglumine / Q000008:administration & dosage*; D005260:Female; D007408:Intestinal Absorption; D007455:Iodine / Q000378:metabolism / Q000652:urine*
chemical_list: D003973:Diatrizoate; D003974:Diatrizoate Meglumine; D007455:Iodine