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MALDI-TOFMS-oriented early definitive therapy improves the optimal use of antibiotics for Enterococcus spp. bloodstream infection.
Journal of Infection and Chemotherapy : Official Journal of the Japan Society of Chemotherapy 2021 Februrary
Enterococci is one of a major cause of bloodstream infection (BSI). Because of its intrinsic drug-resistant nature, empiric antibiotic treatment tends to be inappropriate. We conducted a single-center retrospective cohort study to evaluate the impact of Matrix-assisted laser desorption and ionization time-of-flight mass spectrometry (MALDI-TOFMS) on the improvement of early antibiotic treatment for enterococcal infection. We also investigated the 28-day mortality, length of hospitalization and duration of antibiotic treatment for enterococcal bacteremia. A total of 173 BSI episodes (172 patients) between June 2012 and June 2019 were enrolled. Patients were divided into 2 groups before (n = 82) and after (n = 91) the implementation of MALDI-TOFMS (Control group and MALDI-TOF group, respectively). Almost an equal number of Enterococcus faecalis and Enterococcus faecium cases were identified in each group (51.2% and 48.8%, and 47.3% and 52.7% in each group). By implementing MALDI-TOFMS, the time to definitive antibiotic treatment was significantly improved (median 3 vs 1 days, p < 0.001). The 28-day mortality (29.3% vs 26.4%, p = 0.63) and length of hospitalization (median 16 vs 19 days, p = 0.58) were not significantly different. The duration of antibiotic treatment did not significantly differ between the two groups (median 11 vs 11 days, p = 0.78), but the duration was often shorter in older patients (>74 years old) in MALDI-TOF group, excluding those in the terminal phase of malignancy. By implementing MALDI-TOFMS, the time to definitive antibiotic treatment was significantly shortened. Although associated outcomes did not significantly differ, the duration of antibiotic treatment may be shortened.
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