2679. Factors Associated with Multidrug-resistant Gram-Negative Bacteremia in Acute Leukemia Patients with Neutropenic Fever, a Retrospective Study

BACKGROUND: Gram--negative bacteremia in acute leukemia patients with neutropenia is associated with high morbidity and mortality rate. Appropriate antibiotic for empirical treatment is crucial; however, antibiotic selection is challenging especially in setting with high prevalence of infections with multidrug-resistant (MDR) organisms. Data on associated factors of MDR Gram-negative bacteremia in this population is limited. METHODS: A retrospective study was conducted in King Chulalongkorn Hospital, Bangkok, Thailand. Medical records of patients aged ≥15 years with acute leukemia who were hospitalized in our institute and had neutropenic fever between 1 January 2001 and 31 December 2016 were reviewed. Demographic data, causative organisms, treatment and outcomes were documented. Episodes of MDR Gram-negative bacteremia were compared with non-MDR group. Associated risk factor was assessed by multivariate logistic regression RESULTS: From total 405 admission records of 227 acute leukemia patients, 587 episodes of neutropenic fever occurred with 131 episodes of Gram-negative bacteremia. Majority (81.68%) were bacteremia without source of infection. Most common causative pathogens were E. coli, P. aeruginosa and K. pneumoniae, respectively. Sixty episodes of Gram-negative bacteremia (53.57%) were caused by MDR pathogen. Associated factor for MDR Gram-negative bacteremia was prior colonization or infection with MDR Gram-negative bacteria within 3 months (P = 0.049). Subgroup analysis in patients with non-lactose fermenter bacteremia showed higher rate of intensive care unit (ICU) admission and in-hospital death in MDR group (P = 0.03 and P = 0.004). CONCLUSION: Prior colonization or infection by MDR Gram-negative bacteria within 3 months was associated with MDR Gram-negative bacteremia in acute leukemia patients with neutropenic fever. Thoroughly review of previous culture data and active screening for colonization may increase chance of appropriate empirical antibiotics. [Image: see text] [Image: see text] [Image: see text] DISCLOSURES: All authors: No reported disclosures.