Abstract
The penetration of penicillin into tissue cage fluid (TCF) in calves was studied after intravenous and intramuscular injection. The penicillin concentrations in TCF were lower than in serum and maximum was reached much later. Intravenous injection of benzyl-penicillin gave significantly higher levels in TCF than intramuscular injection. The penetration after procaine penicillin was very slow. The results showed that the serum peak rather than the area under curve determines the penetration of penicillin. Repeated intramuscular injections of benzylpenicillin and procaine penicillin caused an accumulation of penicillin in TCF. Similar levels were however reached by one single intravenous injection. The clinical counterparts to the used tissue cage model are abscesses. It was concluded that if high penicillin concentration are desireable in such foci, the drug must be given in a way that gives as high serum peaks as possible.
Keywords: penetration, interstitial fluid, serum concentration
Sammanfattning
Koncentrationerna av penicillin i serum och vävnadsvätska uppsamlad med hjälp av vävnadskammare studerades hos kalv. Intravenös injektion gav mycket högre koncentrationer i vävnadskammare än intramuskulär. Penetrationen till kammarvätskan skedde mycket långsamt efter injektion av prokainpenicillin. Resultaten visade att höga koncentrationstoppar i serum har en avgörande betydelse för penetrationen till kammarvätskan. Upprepade intramuskulära injektioner gav en ackumulation av penicillin i kamrarna. Lika höga koncentrationer kunde dock uppnås efter en enida intravenös injektion. Den kilniska motsvarigheten til vävnadskammare är abscesser. Det konkluderades att när höga penicillinkoncentrationer är önskvärda i svårtillgängliga infektionsfoci bör penicillin tillföras på ett sådant sätt att högsta möjliga serumkoncentrationer uppnås.
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