Fortified antibiotic ointment in bacterial keratitis
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R A Hyndiuk1, D N Skorich, S D Davis
1Department of Ophthalmology, Medical College of Wisconsin, Milwaukee.
Abstract:
We conducted experiments to determine the effectiveness of fortified antibiotic ointment in the treatment of Pseudomonas keratitis in rabbits. We evaluated gentamicin ointment (3, 10, 20, and 40 mg/g), gentamicin solution (3 and 10 mg/ml), and placebo, each given every 30 minutes. We also examined the effectiveness of fortified ointment given in extended treatment intervals. In short-term trials, commercial-strength gentamicin solution (3 mg/ml) was therapeutically superior (P less than .001) to commercial-strength gentamicin ointment (3 mg/g) in reducing corneal bacterial colony counts. No significant difference in antimicrobial effect was noted between fortified gentamicin ointment and fortified gentamicin solution at 30-minute treatment intervals. Fortified gentamicin ointment reduced colony counts even at extended treatment intervals of up to four hours in a severe keratitis model.
Insights
Fortified gentamicin ointment effectively treats Pseudomonas keratitis in rabbits, showing significant antimicrobial effects even with extended treatment intervals. This offers a promising therapeutic option for bacterial eye infections.
Area of Science:
- Ophthalmology
- Microbiology
- Pharmacology
Background:
- Pseudomonas keratitis is a severe bacterial eye infection.
- Antibiotic treatment is crucial for managing keratitis.
- Gentamicin is a common antibiotic used for bacterial infections.
Purpose of the Study:
- To evaluate the efficacy of fortified gentamicin ointment versus solution in treating Pseudomonas keratitis in rabbits.
- To assess the impact of different concentrations and treatment intervals of gentamicin on corneal bacterial counts.
- To determine if fortified gentamicin ointment can be effective at extended treatment intervals.
Main Methods:
- Experimental study involving rabbits with induced Pseudomonas keratitis.
- Administration of various concentrations of gentamicin ointment and solution, alongside a placebo.
- Evaluation of antimicrobial effect by measuring corneal bacterial colony counts at different time points.
- Comparison of treatment outcomes between different gentamicin formulations and administration schedules.
Main Results:
- Gentamicin solution (3 mg/ml) was superior to ointment (3 mg/g) in short-term trials for reducing bacterial counts.
- Fortified gentamicin ointment and solution showed comparable antimicrobial effects at 30-minute intervals.
- Fortified gentamicin ointment demonstrated efficacy in reducing bacterial counts even when administered at extended intervals (up to four hours) in a severe keratitis model.
Conclusions:
- Fortified gentamicin ointment is a viable and effective treatment for Pseudomonas keratitis.
- Extended treatment intervals for fortified gentamicin ointment are feasible and maintain antimicrobial activity.
- This study supports the use of fortified gentamicin ointment as a therapeutic option for bacterial keratitis, particularly when frequent administration is challenging.