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Type: Journal article
Title: Vancomycin AUC/MIC ratio and 30-Day mortality in patients with Staphylococcus aureus bacteremia
Author: Holmes, N.
Turnidge, J.
Munckhof, W.
Robinson, J.
Korman, T.
O'Sullivan, M.
Anderson, T.
Roberts, S.
Warren, S.
Gao, W.
Howden, B.
Johnson, P.
Citation: Antimicrobial Agents and Chemotherapy, 2013; 57(4):1654-1663
Publisher: Amer Soc Microbiology
Issue Date: 2013
ISSN: 0066-4804
Statement of
Natasha E. Holmes, John D. Turnidge, Wendy J. Munckhof, J. Owen Robinson, Tony M. Korman, Matthew V. N. O’Sullivan, Tara L. Anderson, Sally A. Roberts, Sanchia J. C. Warren, Wei Gao, Benjamin P. Howden, Paul D. R. Johnson
Abstract: A ratio of the vancomycin area under the concentration-time curve to the MIC (AUC/MIC) of ≥400 has been associated with clinical success when treating Staphylococcus aureus pneumonia, and this target was recommended by recently published vancomycin therapeutic monitoring consensus guidelines for treating all serious S. aureus infections. Here, vancomycin serum trough levels and vancomycin AUC/MIC were evaluated in a “real-world” context by following a cohort of 182 patients with S. aureus bacteremia (SAB) and analyzing these parameters within the critical first 96 h of vancomycin therapy. The median vancomycin trough level at this time point was 19.5 mg/liter. There was a significant difference in vancomycin AUC/MIC when using broth microdilution (BMD) compared with Etest MIC (medians of 436.1 and 271.5, respectively; P < 0.001). Obtaining the recommended vancomycin target AUC/MIC of ≥400 using BMD was not associated with lower 30-day all-cause or attributable mortality from SAB (P = 0.132 and P = 0.273, respectively). However, an alternative vancomycin AUC/MIC of >373, derived using classification and regression tree analysis, was associated with reduced mortality (P = 0.043) and remained significant in a multivariable model. This study demonstrated that we obtained vancomycin trough levels in the target therapeutic range early during the course of therapy and that obtaining a higher vancomycin AUC/MIC (in this case, >373) within 96 h was associated with reduced mortality. The MIC test method has a significant impact on vancomycin AUC/MIC estimation. Clinicians should be aware that the current target AUC/MIC of ≥400 was derived using the reference BMD method, so adjustments to this target need to be made when calculating AUC/MIC ratio using other MIC testing methods.
Keywords: Humans
Staphylococcus aureus
Staphylococcal Infections
Anti-Bacterial Agents
Microbial Sensitivity Tests
Retrospective Studies
Aged, 80 and over
Rights: Copyright © 2013, American Society for Microbiology. All Rights Reserved.
DOI: 10.1128/AAC.01485-12
Appears in Collections:Aurora harvest
Molecular and Biomedical Science publications

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