Abstract
To determine whether target concentration non-attainment can be anticipated in critically ill patients prior to initiating empiric β-lactam antibiotic therapy based on readily available clinical factors. Retrospective review of consecutive patients treated with piperacillin or meropenem and who underwent therapeutic drug monitoring (TDM) at St Vincent’s Hospital (Sydney, Australia) between January 2013 and December 2015 was performed. Predefined subgroups were patients who received continuous renal replacement therapy (CRRT) and those who did not (non-CRRT). Potential risk factors were evaluated by correlation with β-lactam antibiotic trough concentrations (Cmin) lower than or equal to targeted minimum inhibitory concentration (MIC). Only the first drug concentration after initiation of the antibiotic treatment was included to reflect empirical dose selection. A total of n = 249 patients (piperacillin, n = 169; meropenem, n = 80) were investigated. For non-CRRT patients (n = 210), multivariate analysis demonstrated the following: male gender (p = 0.006); younger age (p = 0.015); prescribed daily antibiotic dose less than 1.5 times the product information recommendations (p = 0.004); lack of positive microbiology (p = 0.006); lower overall illness severity (p = 0.005); and estimated glomerular filtration rate (eGFR) ≥ 90 mL/min/1.73 m2 (p < 0.001), to be associated with Cmin ≤ MIC. No predictor variable was found to be significantly associated with Cmin ≤ MIC for the CRRT cohort. Evaluating the risk of target concentration non-attainment using simple clinical factors is possible at the bedside for non-CRRT patients prior to empiric antibiotic initiation. Clinicians should be wary of selecting doses based on the product information especially when treating younger male patients with apparently ‘normal’ renal function.
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17 June 2021
A Correction to this paper has been published: https://doi.org/10.1007/s10096-021-04291-6
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Acknowledgements
The preliminary results of this study were presented at the 25th European Congress of Clinical Microbiology and Infectious Disease. We wish to thank the staff of the TDM Laboratory, SydPath (assaying of specimens) and Intensive Care (collection of specimens), St Vincent’s Hospital.
Funding
This work was supported by the University of Notre Dame Australia at the School of Medicine Sydney (NO333732 to SI) and an Australian Government Research Training Program (RTP) Scholarship to IS.
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SI collected data and prepared the manuscript. HB, DM, RD and RN assisted with study design and reviewed the manuscript. GJ assisted with study design, data collection and reviewed the manuscript. SG performed data analysis and reviewed the manuscript. IS conceived and designed the study, performed preliminary data analysis and reviewed the manuscript.
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Ethical review and approval was obtained through St Vincent’s Hospital Sydney Human Research Ethics Committee (Reference: LNR/14/SVH/148, SSA: LNRSSA/14/SVH/226).
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The authors declare that they have no competing interests.
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Imani, S., Buscher, H., Day, R. et al. An evaluation of risk factors to predict target concentration non-attainment in critically ill patients prior to empiric β-lactam therapy. Eur J Clin Microbiol Infect Dis 37, 2171–2175 (2018). https://doi.org/10.1007/s10096-018-3357-9
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DOI: https://doi.org/10.1007/s10096-018-3357-9