title: Serum and synovial fluid concentrations of ampicillin trihydrate in calves with suppurative arthritis.
abstract: Eight calves with suppurative arthritis were each given a single intramuscular injection of ampicillin trihydrate at a dose of 10 mg/kg. Ampicillin concentrations were measured serially in serum and in suppurative and normal synovial fluid over a 24-hour period. The mean peak serum concentration was 2.5 +/- 0.54 micrograms/ml 2 hours after injection. The highest concentration in normal synovial fluid was 3.5 +/- 0.40 micrograms/ml at 4 hours and the highest concentration in suppurative synovial fluid was 2.7 +/- 0.58 micrograms/ml at 2 hours. Overall mean ampicillin concentration in normal synovial fluid for the first 8 h (2.9 +/- 0.32 micrograms/ml) was significantly different from that in suppurative synovial fluid (2.1 +/- 0.33 micrograms/ml) and serum (1.9 +/- 0.30 micrograms/ml; p less than 0.05).
authors.affiliation: Department of Large Animal Clinical Sciences, College of Veterinary Medicine, University of Florida, Gainesville 32610-0136.
authors.forename: M P
authors.initials: MP
authors.lastname: Brown
authors.forename: M B
authors.initials: MB
authors.lastname: Mayo
authors.forename: R R
authors.initials: RR
authors.lastname: Gronwall
mesh_terms: D000667:Ampicillin / Q000008:administration & dosage / Q000097:blood / Q000493:pharmacokinetics*; D000818:Animals; D001170:Arthritis, Infectious / Q000378:metabolism / Q000662:veterinary*; D002417:Cattle; D002418:Cattle Diseases / Q000378:metabolism*; D005260:Female; D007273:Injections, Intramuscular / Q000662:veterinary; D008297:Male; D013582:Synovial Fluid / Q000378:metabolism*
chemical_list: D000667:Ampicillin