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Gentamicin and cefsulodin efficacy in a rat abscess model
Surgery, Gynecology & Obstetrics
|September 1, 1982
Summary
Gentamicin and cefsulodin reached therapeutic levels in rat abscesses. Cefsulodin effectively sterilized abscesses, while gentamicin showed limited efficacy due to low oxygen tension.
Area of Science:
- Pharmacology
- Microbiology
- Infectious Diseases
Background:
- Abscesses caused by Pseudomonas aeruginosa pose treatment challenges.
- Understanding antibiotic pharmacokinetics and efficacy in abscess environments is crucial.
Purpose of the Study:
- To evaluate the pharmacokinetics and therapeutic efficacy of gentamicin and cefsulodin in a rat abscess model.
- To investigate the impact of abscess microenvironment on antibiotic activity.
Main Methods:
- An abscess model in rats was induced using Pseudomonas aeruginosa and a foreign body.
- Pharmacokinetic parameters (concentration in abscess fluid, ultrafiltrate, and blood) were measured.
- Therapeutic efficacy was assessed by abscess sterilization rates.
Main Results:
- Both gentamicin and cefsulodin achieved therapeutic concentrations within abscess fluid and ultrafiltrate.
- Antibiotic levels persisted longer in abscess fluid compared to blood.
- Gentamicin failed to prevent abscess development or reduce bacterial load.
- Cefsulodin sterilized 82.7% of abscesses in 61.5% of treated rats.
Conclusions:
- Low oxygen tension in abscesses likely contributed to gentamicin's inefficacy.
- Cefsulodin demonstrated significant sterilizing activity against Pseudomonas aeruginosa abscesses.
- The study highlights the importance of microenvironmental factors in antibiotic treatment outcomes.