ArticleEuropean spine journal : official publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society2025
Spondylodiscitis relevant tissue concentrations of cefuroxime - a large animal microdialysis study.
Article in European spine journal : official publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
purposeSpondylodiscitis is a serious condition requiring prolonged antibiotic therapy. Relevant pharmacokinetic tissue understanding of antibiotics in a spondylodiscitis setting is limited. The study aimed to investigate cefuroxime concentrations in the L4/L5 intervertebral disc, lumbar bone, paravertebral muscle and subcutaneous tissue using microdialysis.
methodsEight pigs received 1,500 mg of cefuroxime by intravenous bolus infusion over 10 min. Prior to cefuroxime administration, microdialysis catheters were placed in the L4/L5 intervertebral disc, lumbar bone, paravertebral muscle and adjacent subcutaneous tissue for sampling across an 8-h dosing interval. Plasma samples were obtained for reference. Based on prior time-kill modelling for cefuroxime, 40% of the dosing interval with concentrations above the minimum inhibitory concentration (40% T > MIC) for Staphylococcus aureus was chosen as the primary endpoint.
resultsThe 40% T > MIC target exposure was surpassed in all investigated compartments in 5/8 pigs at the lowest MIC-target of 1 [Formula: see text]g/mL. None of the pigs achieved the 40% T > MIC at the clinical breakpoint MIC for S. aureus of 4 [Formula: see text]g/mL. Mean %T > MIC was comparable across the spondylodiscitis relevant tissues at MICs of 1 (range: 43-60%), 2 (range: 30-38%)[Formula: see text] and 4 [Formula: see text]g/mL (range: 16-26%).
conclusionShort-infused cefuroxime dosing standards may under-treat S. aureus spondylodiscitis, increasing the risk of inadequate bacterial killing and resistance development. Given the severity of spondylodiscitis, alternate clinical dosing strategies for cefuroxime may be necessary, such as shorter dosing intervals or prolonged/continuous infusion.
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