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Background Colistin is a last resort antibiotic against infections with CRKp. Its increased use has led to resistance to this antibiotic. Methods This was a single-center, retrospective, cohort study including all CRKp BSIs treated between January 1, 2014 and July 31, 2018. Antibiotic therapy was appropriate if initiated within 5 days from the onset of BSI including at least an active drug with an adequate dosage. Exclusion criteria were missing key data, death &lt; 24 h after inclusion, subsequent episodes in the same patients, pregnancy, polymicrobial BSI, &lt; 18 years of age, no ID consultation, no carbapenemase gene detection by multiplex PCR for blaKPC, blaNDM, blaVIM, blaIMPand blaOXA48. EUCAST breakpoints were used for antibiotic susceptibilities. Colistin MIC was determined by using broth microdilution. FDA criteria were applied for tigecycline susceptibility Results Among 174 CRKp BSIs, 129 met all inclusion criteria. Susceptibility to antibiotics was as follows: colistin (51.9%), tigecycline (67.4%), gentamicine (38.0%), amikacin (43.0%), meropenem (32.6%), ciprofloxacin (18.6%), TMP-SMX (24.0%), ceftazidime (7.8%), cefepime (7.8%). 66.1% and 19.4% of the patients received inappropriate therapy in ColR-CRKp and ColS-CRKp groups, respectively (P ≤ 0.001). We incorporated interaction between colistin susceptibility and inappropriate therapy into multivariate logistic regression analysis (MLRA) that was constructed for identification of independent risk factors for 30-day mortality. The variables having P ≤ 0.1 in crude analysis were included in MLRA. After checking correlation between variables by Pearson correlation analysis and multicollinearity analysis, the final model was builded. The results are shown in Table 2. Conclusion Colistin resistance and inappropriate therapy were not associated with decreased mortality individually, however their interaction significantly increased 30-day mortality rate (OR: 4.04; 95% CI: 1.62–10.02; P = 0.003).85.5% of ColR-CRKp isolates produced an OXA-48 enzyme which can be inhibited by ceftazidime–avibactam, but not available in our setting, treatment with this agent may have altered the mortality rates. Thus, high rate colistin resistance among CRKp isolates remains as a significant cause of mortality in our setting. Disclosures All authors: No reported disclosures.

open forum infectious diseases

2277. Comparison of 30-day Crude Mortality Rates in Patients with Bloodstream Infections (BSIs) Caused by Colistin Susceptible-(ColS-CRKp) vs. Colistin and Carbapenem-Resistant Klebsiella pneumoniae(ColR-CRKp)