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A microbiological method for determining serum levels of broad spectrum beta-lactam antibiotics in critically ill patients
Kalmar County Hospital, Sweden.
Kalmar County Hospital, Sweden; Linnaeus University, Sweden.
Linköping University, Department of Clinical and Experimental Medicine, Division of Microbiology and Molecular Medicine. Linköping University, Faculty of Medicine and Health Sciences. Kalmar County Hospital, Sweden; Linnaeus University, Sweden.
2016 (English)In: Journal of Microbiological Methods, ISSN 0167-7012, E-ISSN 1872-8359, Vol. 129, 23-27 p.Article in journal (Refereed) Published
Abstract [en]

Background: Recent studies show that suboptimal blood levels of beta-lactam antibiotics are present in intensive care unit (ICU) patients. A common reference method for assessing drug concentrations is liquid chromatography coupled with mass-spectrometry (LC-MS) which is highly accurate but rarely available outside reference centres. Thus, our aim was to develop a microbiological method for monitoring beta-lactam antibiotic serum levels which could be used at any hospital with a microbiological laboratory. Methods: The method was developed as a 96-well broth microdilution format to assess the concentrations of cefotaxime (CTX), meropenem (MER), and piperacillin (PIP). Patient serum containing antibiotics were diluted in suspensions of bacteria with known minimal inhibitory concentrations (MICs). Serum antibiotic concentrations were calculated by dividing the MIC with the dilution factor at which the serum inhibited growth of the bacterial suspension. Serum (n = 88) from ICU patients at four hospitals in south-east Sweden were analysed and compared to LC-MS analysis. Results: The overall accuracy and precision for spiked samples and patient samples was within the pre-set target of +/- 20.0% for all drugs. There was a significant correlation between the microbiological assay and LC-MS for the patient samples (CTX: r = 0.86, n = 31; MER: r = 0.96, n = 11; PIP: r = 0.88, n = 39) and the agreement around the clinical cut-off for CTX (4.0 mg/l), MER (2.0 mg/l) and PIP (16.0 mg/l) was 90%, 100% and 87%, respectively. Conclusion: The microbiological method has a performance for determination of serum levels of meropenem, piperacillin and cefotaxime suitable for clinical use. It is an inexpensive method applicable in any microbiology laboratory. (C) 2016 Elsevier B.V. All rights reserved.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV , 2016. Vol. 129, 23-27 p.
Keyword [en]
beta-Lactam antibiotics; Cefotaxime; Meropenem; Piperacillin; Microbiological method; Drug concentration
National Category
Pharmaceutical Sciences
Identifiers
URN: urn:nbn:se:liu:diva-132051DOI: 10.1016/j.mimet.2016.07.020ISI: 000383941500005PubMedID: 27469351OAI: oai:DiVA.org:liu-132051DiVA: diva2:1038469
Note

Funding Agencies|research council of Southeast Sweden (FORSS); Marianne and Marcus Wallenberg foundation [2012-0119]

Available from: 2016-10-18 Created: 2016-10-17 Last updated: 2016-10-18

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Schön, Thomas
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