Single-dose pharmacokinetics of XXXX in porcine cancellous and cortical bone determined by microdialysis.

@entity1707 @entity2176 @entity4034 @entity281 @entity1386
UNASSIGNED: High treatment failure rates and the need for prolonged antimicrobial therapy for @entity4034 and @entity281 suggest that antimicrobial bone penetration may be incomplete. Assessment of the bone pharmacokinetics of antimicrobials is challenged by a lack of validated methods. In this study, 1000mg of @entity2176 was administered as a single dose over 100min to eight female @entity1707 . Plasma, @entity1386 ( @entity1386 ) and bone pharmacokinetics were investigated over 12h. Microdialysis was applied for collection of samples in bone and @entity1386 . The @entity2176 concentration in microdialysates was determined using ultra-high performance liquid chromatography, whilst the free plasma concentration was determined using Cobas c501. The mean (95% CI) area under the concentration-time curve (AUC0-last; min g/mL) was 9375 (7445-11304), 9304 (7374-11233), 5998 (3955-8040) and 3451 (1522-5381) for plasma, @entity1386 , and cancellous and cortical bone, respectively (ANOVA P-value <0.001). Both cortical and cancellous bone AUC0-last were lower than that of free plasma (P<0.01). Peak drug concentrations (Cmax) in cortical and cancellous bone were also significantly lower than that of free plasma (P<0.001). Moreover, both AUC0-last and Cmax were significantly lower in cortical bone than in cancellous bone (P<0.025). Bone penetration of @entity2176 was found to be incomplete and delayed. Significant differences in pharmacokinetics between cancellous and cortical bone suggest that bone may not be considered as one compartment. Future studies should focus on validating the applicability of microdialysis for assessment of antimicrobial bone pharmacokinetics.
