Treatment duration for Escherichia coli bloodstream infection and outcomes: retrospective single centre study.

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Treatment duration for Escherichia coli bloodstream infection and outcomes: retrospective single centre study.

Clin Microbiol Infect. 2018 Jan 22;:

Authors: Giannella M, Pascale R, Foschi A, Ferraro G, Graziano E, Furii F, Bartoletti M, Tedeschi S, Ambretti S, Lewis RE, Viale P

Abstract
OBJECTIVES: To investigate the impact of treatment duration on mortality and on relapse in patients with Escherichia coli bloodstream infection (BSI).
METHODS: Retrospective single-centre study of patients diagnosed with E. coli BSI at our centre over 4-year period.
EXCLUSION CRITERIA: age <18 years, clinical data not available, polymicrobial BSI, failure to receive in vitro active therapy, and death while receiving antibiotic therapy. Exposure variable was treatment duration dichotomized in short (≤ 10 days) and long (>10 days) therapy. Primary endpoint was all-cause mortality within 90 days after index BSI. Secondary endpoint was relapse, defined as repeat isolation of E. coli from blood cultures within 90 days after index BSI, in patients with documented clinical cure and completion of therapy for the initial episode.
RESULTS: Of the 856 analysed patients: 426 received short and 430 received long therapy. All-cause mortality at day 90 occurred in 47 patients; at multivariate analysis, short therapy was not associated with higher risk of mortality also after adjusting the model for the propensity score of receiving short therapy. Relapse occurred in 42 patients. Independent risk factors for relapse using death as competing risk were immunosuppression (SHR 4.67, p<0.001), and end-stage-liver-disease (SHR 2.58, p=0.013). The propensity-weighted estimation of the average treatment effect for relapse reduction with long therapy (>10 days) was -1.6% (p=0.26) in total population, and -7.1% (p=0.18) in immunocompromised patients.
CONCLUSIONS: We could not identify shorter treatment duration as a risk factor for mortality and for relapse in patients with E. coli BSI.

PMID: 29371138 [PubMed - as supplied by publisher]

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