title: Pharmacokinetics and clinical utility of sodium bromide (NaBr) as an estimator of extracellular fluid volume in horses.
abstract: The purpose of this study was to describe the pharmacokinetics of bromide in horses and to evaluate the corrected bromide space as an indicator of extracellular fluid volume (ECFV) in horses after the administration of a single dose of bromide by intravenous infusion. Sodium bromide (30 mg/kg of body weight, IV) was administered to 6 clinically healthy mares over a period of 3 minutes. Blood samples were collected before infusion and at intervals between 0.5 hours and 53 days after infusion. Mean elimination half-life (harmonic mean) was 126 hours (5.2 days), clearance was 1.4 +/- 0.09 mL/(kg x h), area under the curve was 17,520 +/- 1,100 microg x h/mL. and volume of distribution (steady state) was 0.255 +/- 0.015 L/kg. The mean corrected bromide space was determined from the volume of distribution (steady state) and the serum concentrations of bromide at equilibration. Corrected bromide space, an estimate of ECFV, was 0.218 +/- 0.01 L/kg. The conclusion was made that ECFV of horses can be estimated by measuring bromide concentrations in a preinfusion serum sample and a sample obtained 5 hours after the administration of bromide.
authors.affiliation: Veterinary Medical Teaching Hospital, School of Veterinary Medicine, University of California, Davis, CA 95616,USA.
authors.forename: C Langdon
authors.initials: CL
authors.lastname: Fielding
authors.forename: K Gary
authors.initials: KG
authors.lastname: Magdesian
authors.forename: Denise A
authors.initials: DA
authors.lastname: Elliott
authors.forename: Arthur L
authors.initials: AL
authors.lastname: Craigmill
authors.forename: W David
authors.initials: WD
authors.lastname: Wilson
authors.forename: Gary P
authors.initials: GP
authors.lastname: Carlson
mesh_terms: D000818:Animals; D001965:Bromides / Q000008:administration & dosage / Q000493:pharmacokinetics*; D005110:Extracellular Space; D005260:Female; D006736:Horses; D017670:Sodium Compounds / Q000008:administration & dosage / Q000493:pharmacokinetics*; D014882:Water-Electrolyte Balance
chemical_list: D001965:Bromides; D017670:Sodium Compounds; C027938:sodium bromide