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Multicentre study of risk factors for mortality in patients with Acinetobacter bacteraemia receiving colistin treatment.

Abstract：

:Colistin remains a last-line antibiotic for the treatment of infections by multidrug-resistant Acinetobacter species. However, mortality rates are high in patients with Acinetobacter infection receiving colistin treatment. This multicentre study evaluated whether colistin susceptibility, additional antimicrobial agents or other prognostic factors influenced the clinical outcomes of patients receiving colistin treatment for Acinetobacter bacteraemia. This retrospective study enrolled 122 adults receiving colistin for monomicrobial Acinetobacter bacteraemia at six medical centres in the ACTION Study Group over an 8-year period. Clinical information, antimicrobial susceptibility and colistin resistance determinants were analysed. The primary outcome measure was 14-day mortality. Among 122 patients, 18 and 104 were infected with colistin-resistant (ColR) isolates [minimum inhibitory concentration (MIC) ≥4 mg/L] and colistin-susceptible (ColS) isolates (MIC ≤2 mg/L), respectively. Patients infected with ColR and ColS isolates did not differ significantly with regard to Charlson comorbidity index, invasive procedures, sources of bacteraemia, disease severity and 14-day mortality rate (44.4% vs. 34.6%; P = 0.592). No specific additional antimicrobial agent was independently associated with higher or lower mortality. Coronary artery disease, higher Acute Physiology and Chronic Health Evaluation (APACHE) II score and bacteraemia caused Acinetobacter baumannii were independent risk factors associated with 14-day mortality. Mechanisms of colistin resistance were associated with amino acid variants in the pmrCAB operon. Finally, previously unreported Acinetobacter nosocomialis amino acid variants related to colistin resistance were identified. In conclusion, colistin susceptibility and colistin combination antimicrobial treatment were not associated with decreased 14-day mortality in patients with Acinetobacter bacteraemia receiving colistin treatment.

journal_name

Int J Antimicrob Agents

journal_title

International journal of antimicrobial agents

authors

Lee YT,Sun JR,Wang YC,Chiu CH,Kuo SC,Chen TL,ACTION Study Group.,Yang YS

doi

10.1016/j.ijantimicag.2020.105956

subject

Has Abstract

pub_date

2020-06-01 00:00:00

pages

105956

issue

6

eissn

0924-8579

issn

1872-7913

pii

S0924-8579(20)30106-0

journal_volume

55

pub_type

杂志文章

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