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Ciprofloxacin as therapy for experimental osteomyelitis caused by Pseudomonas aeruginosa
Abstract:
Ciprofloxacin, a new carboxyquinoline antimicrobial agent, was compared with tobramycin in the treatment of chronic osteomyelitis due to Pseudomonas aeruginosa in rabbits. Treatment with tobramycin for four weeks was ineffective (94% had positive bone cultures). In contrast, ciprofloxacin administered for four weeks sterilized the bones of all but one (94%) of 18 treated rabbits. Treatment with ciprofloxacin for two weeks was less effective than treatment for four weeks but was more effective than either treatment with tobramycin or no therapy. Two of 10 isolates from rabbits treated with ciprofloxacin for two weeks were susceptible to MICs of ciprofloxacin that were 16- and fourfold greater than the MIC for the parent strain; the other eight isolates remained sensitive to ciprofloxacin with MICs equivalent to that of the parent strain.
Insights
Ciprofloxacin effectively treated chronic osteomyelitis caused by Pseudomonas aeruginosa in rabbits, sterilizing bones in 94% of cases after four weeks. This new carboxyquinoline agent outperformed tobramycin and shorter treatment durations.
Area of Science:
- Infectious Diseases
- Pharmacology
- Surgical Infections
Background:
- Chronic osteomyelitis is a challenging bone infection often caused by Pseudomonas aeruginosa.
- Pseudomonas aeruginosa infections are notoriously difficult to treat, especially in bone tissue.
- Existing treatments like tobramycin have shown limited efficacy in chronic cases.
Purpose of the Study:
- To compare the efficacy of ciprofloxacin versus tobramycin in treating chronic Pseudomonas aeruginosa osteomyelitis in a rabbit model.
- To evaluate the effectiveness of different treatment durations for ciprofloxacin.
Main Methods:
- A rabbit model of chronic osteomyelitis was established using Pseudomonas aeruginosa.
- Animals were treated with either ciprofloxacin or tobramycin for four weeks, or ciprofloxacin for two weeks.
- Bone cultures were used to assess bacterial eradication, and minimum inhibitory concentrations (MICs) were determined.
Main Results:
- Four weeks of tobramycin treatment was ineffective, with 94% of rabbits showing positive bone cultures.
- Four weeks of ciprofloxacin treatment sterilized the bones in 94% of rabbits (17 out of 18).
- Two weeks of ciprofloxacin was more effective than tobramycin or no therapy, but less effective than four weeks of ciprofloxacin.
Conclusions:
- Ciprofloxacin demonstrates significant efficacy in treating chronic Pseudomonas aeruginosa osteomyelitis in rabbits.
- Four weeks of ciprofloxacin therapy is highly effective in eradicating the infection.
- Ciprofloxacin represents a promising therapeutic option for chronic osteomyelitis caused by this pathogen.