Risk factors and outcome analysis of acinetobacter baumannii complex bacteremia in critical patients.

Abstract:

OBJECTIVES:Acinetobacter baumannii complex bacteremia has been identified increasingly in critical patients admitted in ICUs. Notably, A. baumannii complex bacteremia has a high mortality rate, yet the risk factors associated with mortality remain unclear and controversial. DESIGN:Retrospective study. SETTING:All adult ICUs at a tertiary care medical center. PATIENTS:All patients with A. baumannii complex bacteremia admitted in 2009-2010. INTERVENTIONS:None. MEASUREMENTS AND MAIN RESULTS:Risk factors for mortality were analyzed. Bacterial isolates were identified by 16S-23S ribosomal RNA intergenic spacer region sequencing for genospecies and genotyped by pulsed-field gel electrophoresis. Carbapenemase genes were detected by polymerase chain reaction and sequencing. A total of 298 patients met the inclusion criteria, including 73 (24.5%) infected by imipenem-resistant A. baumannii complex. The overall 30-day mortality was 33.6% (100 of 298). Imipenem-resistant A. baumannii complex bacteremia specifically showed a high mortality (69.9%) and was associated with prior use of broad-spectrum antibiotics for more than 5 days for treating ventilator-associated pneumonia before the occurrence of bacteremia. Mortality was associated with inappropriate initial antimicrobial therapy, which was correlated with imipenem-resistant A. baumannii complex but not with any specific genospecies. ISAba1-blaOXA-23-ISAba1 (Tn2006) was found in most (66.7%, 40 of 68) imipenem-resistant A. baumannii (genospecies 2) and also spread beyond species border to all imipenem-resistant genospecies 3 (2), 13TU (2), and 10 (1). CONCLUSIONS:For critical patients with A. baumannii complex infection, ventilator-associated pneumonia in particular, the selective pressure from prior use of broad-spectrum antibiotics for 5 days or more increased risk of subsequent imipenem-resistant A. baumannii complex bacteremia. To reduce mortality, rapid identification of imipenem-resistant A. baumannii complex and early initiation of appropriate antimicrobial therapy in these high-risk patients are crucial.

journal_name

Crit Care Med

journal_title

Critical care medicine

authors

Lee HY,Chen CL,Wu SR,Huang CW,Chiu CH

doi

10.1097/CCM.0000000000000125

subject

Has Abstract

pub_date

2014-05-01 00:00:00

pages

1081-8

issue

5

eissn

0090-3493

issn

1530-0293

journal_volume

42

pub_type

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