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e19020 Background: The prevalence of carbapenem resistant organisms (CRO) are increasing worldwide and associated with grave implications in patients with hematological malignancies. Data on such infections in patients with acute leukemia are scarce, especially from the developing world. The aim of this study was to evaluate characteristics and outcomes of bacteremia with CRO in patients treated for acute leukemia with aggressive chemotherapy regimens. Methods: This prospective observational study was conducted in a tertiary oncology centre in South India. Data on Carbapenem resistant bloodstream infection (CRBSI) in patients with acute leukemia (ALL and AML) aged 14-60 years, from March 2017 to February 2018 were prospectively collected. The final outcome was determined as survival and all-cause death due to CRBSI. Results: Out of 334 patients treated for acute leukemia, 49 patients developed infections with CRO (14.6%). The patients included 27 males (55%) and 22 females (45%), with age ranging from 14 year to 58 years (median age: 42 years). The most common isolates were Klebsiella species (63%) and E.coli (25%). All carbapenem resistant isolates were sensitive to Colistin and 74% were sensitive to Tigecycline. The case-fatality rate was 69% (34/49) in our cohort. Acute kidney injury, shock, septicemia and an initial procalcitonin value > 1mcg/L were predictor of mortality. Disease in remission and neutrophil count recovery post chemotherapy were favorable factors associated with the outcome. There was no statistically significant difference in mortality in patients treated with single agent antibiotics versus combination antibiotics sensitive against CRO. Conclusions: Carbapenem resistant infections in patients with acute leukaemia are associated with a high mortality rate. The factors associated with improved outcome were disease in remission and neutrophil count recovery, post chemotherapy. The presence of acute kidney injury, shock, sepsis and a procalcitonin value more than 1 mcg/L were significant predictor of mortality.

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