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Antibiotic penetration into rabbit nucleus pulposus
Abstract:
A rabbit model was used to determine the penetration of four commonly used antibiotics (clindamycin, tobramycin, cephalothin, and oxacillin) into the nucleus pulposus after receiving an 8-hour course of intramuscular antibiotic injections. Clindamycin and tobramycin achieved therapeutic levels in the nucleus pulposus and both were present in greater than 50% of serum levels. Cephalothin was not detected in the nucleus pulposus and penetrated at less than 4% of serum levels at 1 hour after injection. The data were inconclusive regarding oxacillin penetration.
Insights
Clindamycin and tobramycin showed effective penetration into the nucleus pulposus in a rabbit model, reaching therapeutic antibiotic levels. Cephalothin did not penetrate, and oxacillin penetration was inconclusive.
Area of Science:
- Pharmacology
- Infectious Diseases
- Orthopedics
Background:
- Antibiotic penetration into the nucleus pulposus is crucial for treating disc infections.
- Understanding antibiotic distribution is vital for optimizing treatment strategies.
Purpose of the Study:
- To evaluate the penetration of clindamycin, tobramycin, cephalothin, and oxacillin into the nucleus pulposus.
- To compare antibiotic concentrations in the nucleus pulposus relative to serum levels.
Main Methods:
- A rabbit model was utilized for the study.
- Intramuscular antibiotic injections were administered over an 8-hour period.
- Antibiotic levels in the nucleus pulposus and serum were measured.
Main Results:
- Clindamycin and tobramycin achieved therapeutic levels in the nucleus pulposus, exceeding 50% of serum concentrations.
- Cephalothin was undetectable in the nucleus pulposus, with penetration less than 4% of serum levels at 1 hour.
- Data for oxacillin penetration into the nucleus pulposus were inconclusive.
Conclusions:
- Clindamycin and tobramycin demonstrate promising penetration into the nucleus pulposus for potential therapeutic use.
- Cephalothin exhibits poor penetration, suggesting limited efficacy for nucleus pulposus infections.
- Further investigation is needed to clarify oxacillin's penetration characteristics.