title: Clinical significance of multidrug-resistant Acinetobacter baumannii isolated from central venous catheter tip cultures in patients without concomitant bacteremia.
abstract: BACKGROUND
  The purpose of this study was to examine the clinical implications of a positive central venous catheter (CVC) tip culture with multidrug-resistant Acinetobacter baumannii (MRAB) in patients without concurrent bacteremia.
  
  
  METHODS
  This retrospective, multicenter study was conducted in 9 teaching hospitals in the Republic of Korea from May 2008 to April 2012. Study subjects included adult patients (aged ≥ 18 y) who yielded an MRAB-positive CVC tip culture without concurrent MRAB bacteremia. All patients were observed for the development of subsequent MRAB bacteremia for 6 months after CVC removal. Multivariable Firth logistic regression analysis was performed to determine predictors independently associated with subsequent MRAB bacteremia.
  
  
  RESULTS
  During the study period, subsequent MRAB bacteremia was observed in 18.8% of patients (21/112). Of the 112 patients, 23 (20.5%) did not show systemic inflammatory response syndrome (SIRS). None of the 23 patients without SIRS presented with subsequent MRAB bacteremia. Multivariable logistic regression analysis showed that prior administration of carbapenems (odds ratio (OR) 7.04, 95% confidence interval (CI) 1.43-34.77) or corticosteroids (OR 6.67, 95% CI 1.19-37.44), and C-reactive protein ≥ 40 mg/l (OR 18.11, 95% CI 2.22-148.07) were positive predictive factors. Prior acquisition of MRAB at a site other than the catheter (OR 0.10, 95% CI 0.03-0.39) was a negative predictive factor for developing MRAB bacteremia.
  
  
  CONCLUSIONS
  Our results suggest that patients with a CVC tip colonized with MRAB should be closely monitored for signs and symptoms of subsequent MRAB bacteremia.
authors.affiliation: From the Division of Infectious Diseases, Department of Internal Medicine, Korea University Anam Hospital.
authors.forename: Young Kyung
authors.initials: YK
authors.lastname: Yoon
authors.forename: Jacob
authors.initials: J
authors.lastname: Lee
authors.forename: Seong Yeol
authors.initials: SY
authors.lastname: Ryu
authors.forename: Hyun-Ha
authors.initials: HH
authors.lastname: Chang
authors.forename: Won Suk
authors.initials: WS
authors.lastname: Choi
authors.forename: Ji Hyun
authors.initials: JH
authors.lastname: Yoon
authors.forename: Jian
authors.initials: J
authors.lastname: Hur
authors.forename: Yu Mi
authors.initials: YM
authors.lastname: Jo
authors.forename: Sue-Yun
authors.initials: SY
authors.lastname: Kim
authors.forename: Kyung Sook
authors.initials: KS
authors.lastname: Yang
authors.forename: Shin-Woo
authors.initials: SW
authors.lastname: Kim
mesh_terms: D000151:Acinetobacter Infections / Q000382:microbiology*; D040981:Acinetobacter baumannii / Q000302:isolation & purification*; D000368:Aged; D016470:Bacteremia / Q000382:microbiology*; D055499:Catheter-Related Infections / Q000382:microbiology*; D062905:Central Venous Catheters / Q000382:microbiology*; D024901:Drug Resistance, Multiple, Bacterial; D005260:Female; D006801:Humans; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D016896:Treatment Outcome