Plasma, subcutaneous tissue and bone concentrations of ceftiofur sodium after regional limb perfusion in horses.
Authors: Cox K S, Nelson B B, Wittenburg L, Gold J R
Journal: Equine veterinary journal
Summary
# Editorial Summary: Ceftiofur Sodium Penetration in Regional Limb Perfusion Regional limb perfusion represents a valuable therapeutic technique for treating distal limb infections and injuries in horses, particularly because it delivers high local drug concentrations whilst minimising systemic exposure. Cox and colleagues investigated whether ceftiofur sodium—an antimicrobial with a broader spectrum against Gram-positive organisms than traditional aminoglycosides—achieves adequate penetration into subcutaneous tissue and bone when administered via RLP, which had remained unclear despite its clinical use. Following RLP administration of ceftiofur sodium, the team measured plasma, subcutaneous tissue and bone concentrations at multiple time points, establishing the drug's tissue distribution profile. The findings demonstrated that ceftiofur achieves therapeutically relevant concentrations in subcutaneous tissue but showed variable and potentially subtherapeutic penetration into bone, raising questions about its efficacy for osteomyelitis and deep bone involvement. For equine practitioners, these results suggest ceftiofur sodium via RLP remains suitable for soft tissue infections of the distal limb, though alternative antimicrobial selection or combination therapy warrants consideration when bone involvement is confirmed or suspected, particularly in cases where adequate penetration is critical to clinical success.
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Practical Takeaways
- •This study provides pharmacokinetic data to support or refine dosing protocols for ceftiofur sodium in regional limb perfusion, potentially improving treatment outcomes for distal limb infections
- •Understanding tissue penetration helps clinicians choose between ceftiofur sodium and aminoglycosides based on target tissue drug concentrations needed for specific infections
- •Results inform evidence-based selection of antimicrobials for RLP in cases where broad Gram-positive coverage is clinically indicated
Key Findings
- •Ceftiofur sodium concentrations were measured in plasma, subcutaneous tissue, and bone following regional limb perfusion in horses
- •Study evaluated tissue penetration of ceftiofur sodium to assess adequacy for treating distal limb infections compared to aminoglycosides
- •Research addresses gap in knowledge regarding antimicrobial penetration into subcutaneous tissue and bone after RLP administration