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. 1978 Mar;13(3):368–372. doi: 10.1128/aac.13.3.368

Comparative distribution of gentamicin, tobramycin, sisomicin, netilmicin, and amikacin in interstitial fluid in rabbits.

C Carbon, A Contrepois, S Lamotte-Barrillon
PMCID: PMC352247  PMID: 263882

Abstract

We compared the penetration of five aminoglycosides into interstitial fluid (IF). IF was obtained in rabbits from Silastic tissue cages. Intramuscular injections were made: 1.5 mg/kg per dose for gentamicin (G), tobramycin (T), sisomicin (S), and netilmicin (N) and 7.5 mg/kg per dose for amikacin (A). Serum levels and IF concentrations were studied for 12 h after a single injection. IF levels were also compared in a six-injection study (one injection every 8 h). Peak serum levels were significantly higher with A than with G, T, S, and N, which gave similar concentrations. In IF, G gave the highest levels 1 h after the first injection. At 4 and 8 h, the concentrations achieved with G and A were similar but significantly greater than those achieved with T, S, and N. Twelve hours after a single injection, N gave higher IF levels than the other drugs except A. In the six-injection study, the IF levels of G and A reached 4.6 +/- 1.5 and 5.27 +/- 1.1 microgram/ml, respectively, at 48 h. S and N gave identical concentrations (2.07 +/- 0.25 and 2.42 +/- 0.42 microgram/ml, respectively). T induced the lowest levels (1.17 +/- 0.30 microgram/ml). Thus, in this rabbit model, the IF concentrations achieved with G and A were above the minimal inhibitory concentrations for most susceptible strains. Possible relations between IF aminoglycoside concentrations and therapeutic efficiency or toxicity are pointed out but deserve further studies.

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Selected References

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