title: Effects of methoxyflurane anesthesia on the pharmacokinetics of 125I-IAZA in Sprague-Dawley rats.
abstract: Effects of methoxyflurane anesthesia on the pharmacokinetics of intravenous 125I-IAZA in rats are reported. No significant differences in t(1/2alpha), t(1/2beta), V(SS), and ClTB for total radioactivity (125I-IAZA and metabolites) were observed between the anesthetized (Group 1, n = 4) and nonanesthetized (Group 2, n = 3) animals. For 125I-IAZA, ClTB increased from 646 +/- 52 mL/h/kg to 2250 +/- 351 mL/h/kg and t(1/2beta) decreased from 97.7 +/- 17.5 min to 35.6 +/- 5.4 min, for Groups 1 and 2, respectively. There were no differences in V(SS) or t(1/2alpha) between the two groups. These findings support literature reports of anesthetic effects on xenobiotic pharmacokinetics, and indicate a need for caution in the evaluation of preclinical imaging studies in which animals are immobilized with anesthetics.
authors.affiliation: Faculty of Pharmacy and Pharmacecutical Sciences, University of Alberta, Edmonton, Canada.
authors.forename: D
authors.initials: D
authors.lastname: Stypinski
authors.forename: L I
authors.initials: LI
authors.lastname: Wiebe
authors.forename: Y K
authors.initials: YK
authors.lastname: Tam
authors.forename: J R
authors.initials: JR
authors.lastname: Mercer
authors.forename: A J
authors.initials: AJ
authors.lastname: McEwan
mesh_terms: D000769:Anesthesia, Inhalation; D018685:Anesthetics, Inhalation / Q000494:pharmacology*; D000818:Animals; D019540:Area Under Curve; D001711:Biotransformation; D002138:Calibration; D002851:Chromatography, High Pressure Liquid; D006207:Half-Life; D007457:Iodine Radioisotopes; D007553:Isotope Labeling; D008733:Methoxyflurane / Q000494:pharmacology*; D009593:Nitroimidazoles / Q000493:pharmacokinetics*; D019275:Radiopharmaceuticals / Q000493:pharmacokinetics*; D051381:Rats; D017207:Rats, Sprague-Dawley; D014018:Tissue Distribution
chemical_list: D018685:Anesthetics, Inhalation; D007457:Iodine Radioisotopes; D009593:Nitroimidazoles; D019275:Radiopharmaceuticals; C070588:iodoazomycin arabinoside; D008733:Methoxyflurane