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PubMed2001

Comparison of 2 techniques for regional antibiotic delivery to the equine forelimb: intraosseous perfusion vs. intravenous perfusion.

The purpose of this study was to compare the synovial fluid concentrations and pharmacokinetics of amikacin in the equine limb distal to the carpus following intraosseous and intravenous regional perfusion. The front limbs of 6 horses were randomly assigned to either intraosseous or intravenous perfusion. A tourniquet was placed distal to each carpus and the limb perfused with 500 mg of amikacin. Systemic blood samples and synovial fluid samples were collected over 70 min from the distal interphalangeal (DIP) joint, metacarpophalangeal joint, and digital flexor sheath. The tourniquet was removed following the 30 min sample collection. The mean peak amikacin concentration for the DIP joint was significantly higher with intravenous perfusion. There were no significant differences in time to peak concentration or elimination half-life between methods at each synovial structure. Each technique produced mean peak concentrations ranging from 5 to 50 times that of recommended peak serum concentrations for therapeutic efficacy.

Amikacin↗
PubMed1994

Effect of route of administration and age on the pharmacokinetics of amikacin administered by the intravenous and intraosseous routes to 3 and 5-day-old foals.

The suitability of the intraosseous (i.o.) route for drug administration to equine neonates was evaluated in a study comparing the pharmacokinetics of amikacin administered by the i.o. and intravenous (i.v.) routes. Using a cross-over study design amikacin sulphate (7 mg/kg bwt) was administered i.o. or i.v. to 6 healthy foals at 3 and 5 days of age. Amikacin was instantaneously and completely absorbed after i.o. administration, achieving a mean +/- sd peak concentration (34.17 +/- 3.54 micrograms/ml) in the first sample collected 3 min after administration which was not significantly different from the mean +/- sd peak concentration (32.92 +/- 2.63 micrograms/ml) achieved after i.v. administration. The plasma amikacin concentration-time profiles for the i.o. and i.v. routes were not different and both were appropriately described by a 2-compartment open pharmacokinetic model. No significant differences attributable to route of administration were found in values for the major pharmacokinetic variables. The degree of inter-individual variation in values for indices of clearance was considerably greater than the degree of variation attributable to age. Despite this, values for body clearance (ClB) were significantly higher (P < 0.05) and values for area under the plasma amikacin concentration-time curve (AUC) and concentration of amikacin in plasma at 8 h [Cp(8h)] were significantly lower in 5- than in 3-day-old foals, indicating that amikacin was more rapidly cleared by the older foals. Technical difficulties were not encountered during i.o. needle placement in the medial aspect of the proximal tibia. Mild diffuse soft tissue swelling which developed at the i.o. site resolved completely within 1-2 months.(ABSTRACT TRUNCATED AT 250 WORDS)

Absorption↗