F Dépret1, A Aubry1, A Fournier1, A Charles-Nelson2,3, S Katsahian2,3, F Compain1,3, J L Mainardi1,3, M P Fernandez-Gerlinger1,3. 1. Service de Microbiologie, Unité Mobile de Microbiologie Clinique, Hôpital Européen Georges Pompidou, AP-HP, Paris, France. 2. Pôle Biostatistique et Santé Publique, Hôpital Européen Georges Pompidou, AP-HP, Paris, France. 3. Faculté de Médecine Paris Descartes, Université Paris Descartes, Paris, France.
Abstract
PURPOSE: The aim of this study was to assess if use of the β LACTA test (BLT) for extended-spectrum beta-lactamase (ESBL) detection and/or early bacterial identification by mass spectrometry (MALDI-TOF MS) improves therapeutic decision-making when combined with advice from the antimicrobial stewardship team (AMST) for the management of Gram-negative bacillary (GNB) bacteraemia. METHODS: Prospective observational theoretical study that included patients with GNB bacteraemia during a 6-month period. We compared, against the antimicrobial choice of the local AMST as informed of the Gram-stain result, a hypothetical choice, i.e. one AMST would have made had it been informed of the MALDI-TOF MS results only (option H) with the actual choice AMST made after being informed of the combined MALDI-TOF MS and BLT results (option A).Results/Key findings. A total of 131 episodes of GNB bacteraemia were included. Options H and A led to virtually the same rate of efficient antimicrobial therapy (in 120/131 and 123/131 episodes, respectively, P=0.63). Compared to the gold standard, options H and A did not lead to a significant reduction of carbapenem prescription (9/131, 6/131 and 12/131, P=0.57 and P=0.65, respectively). CONCLUSIONS: Under our test conditions, BLT, when used in conjunction with MALDI-TOF MS and AMST advice, did not allow a significant optimization of the antimicrobial prescription made on the basis AMST advice only. However, the impact of BLT should be evaluated in a population with high prevalence of ESBL-producing Enterobacteriaceae and/or when treatment choices are not made by infectious disease specialists.
PURPOSE: The aim of this study was to assess if use of the β LACTA test (BLT) for extended-spectrum beta-lactamase (ESBL) detection and/or early bacterial identification by mass spectrometry (MALDI-TOF MS) improves therapeutic decision-making when combined with advice from the antimicrobial stewardship team (AMST) for the management of Gram-negative bacillary (GNB) bacteraemia. METHODS: Prospective observational theoretical study that included patients with GNB bacteraemia during a 6-month period. We compared, against the antimicrobial choice of the local AMST as informed of the Gram-stain result, a hypothetical choice, i.e. one AMST would have made had it been informed of the MALDI-TOF MS results only (option H) with the actual choice AMST made after being informed of the combined MALDI-TOF MS and BLT results (option A).Results/Key findings. A total of 131 episodes of GNB bacteraemia were included. Options H and A led to virtually the same rate of efficient antimicrobial therapy (in 120/131 and 123/131 episodes, respectively, P=0.63). Compared to the gold standard, options H and A did not lead to a significant reduction of carbapenem prescription (9/131, 6/131 and 12/131, P=0.57 and P=0.65, respectively). CONCLUSIONS: Under our test conditions, BLT, when used in conjunction with MALDI-TOF MS and AMST advice, did not allow a significant optimization of the antimicrobial prescription made on the basis AMST advice only. However, the impact of BLT should be evaluated in a population with high prevalence of ESBL-producing Enterobacteriaceae and/or when treatment choices are not made by infectious disease specialists.