[Risk factors for extended espectrum beta-lactamase producer E.coli bacteremia from urinary origin].

Background and Objective: Although risk factors for extended spectrum beta lactamase E. coli (EBLE) infection have been explored, specific risk factors for bacteremic urinary tract infection by EBLE have been hardly analyzed.
Patients and Methods: We collected data from all patients with bacteremic urinary tract infection by E. coli attended in our hospital during 2006. Logistic regression was performed to explore predictors for EBLE bloodstream infection in this group of patients.
Results: EBLE was present in 19 cases (17,9%) out of 106 bacteraemia from urinary origin. Patients with bloodstream infection by EBLE were male, older, demented, living in a nursing home, with previous urologic diseases and urologic manipulation, with a higher percentage of previous urinary tract infection, previous antibiotic use, more frequent nosocomial infection, and hospital admission in the previous month. In the logistic regression analysis, only previous urologic diseases (OR 13,9; IC95% 2,5-78,2) and living in a nursing home (OR 6,5; IC95% 1,4-0,9) were associated with EBLE bacteremic urinary tract infection.
Conclusions: Previous urologic disease and living in a nursing home are independent risk factors for EBLE bacteremic urinary tract infection.
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