Attributable mortality of ICU-acquired bloodstream infections: Impact of the source, causative micro-organism, resistance profile and antimicrobial therapy

J Infect. 2017 Feb;74(2):131-141. doi: 10.1016/j.jinf.2016.11.001. Epub 2016 Nov 9.

Abstract

Objectives: ICU-acquired bloodstream infection (ICUBSI) in Intensive Care unit (ICU) is still associated with a high mortality rate. The increase of antimicrobial drug resistance makes its treatment increasingly challenging.

Methods: We analyzed 571 ICU-BSI occurring amongst 10,734 patients who were prospectively included in the Outcomerea Database and who stayed at least 4 days in ICU. The hazard ratio of death associated with ICU-BSI was estimated using a multivariate Cox model adjusted on case mix, patient severity and daily SOFA.

Results: ICU-BSI was associated with increased mortality (HR, 1.40; 95% CI, 1.16-1.69; p = 0.0004). The relative increase in the risk of death was 130% (HR, 2.3; 95% CI, 1.8-3.0) when initial antimicrobial agents within a day of ICU-BSI onset were not adequate, versus only 20% (HR, 1.2; 95% CI, 0.9-1.5) when an adequate therapy was started within a day. The adjusted hazard ratio of death was significant overall, and even higher when the ICU-BSI source was pneumonia or unknown origin. When treated with appropriate antimicrobial agents, the death risk increase was similar for ICU-BSI due to multidrug resistant pathogens or susceptible ones. Interestingly, combination therapy with a fluoroquinolone was associated with more favorable outcome than monotherapy, whereas combination with aminoglycoside was associated with similar mortality than monotherapy.

Conclusions: ICU-BSI was associated with a 40% increase in the risk of 30-day mortality, particularly if the early antimicrobial therapy was not adequate. Adequacy of antimicrobial therapy, but not pathogen resistance pattern, impacted attributable mortality.

Keywords: Antimicrobial therapy; Bloodstream infection; Nosocomial; Outcome.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Aged
  • Aminoglycosides / administration & dosage
  • Aminoglycosides / adverse effects
  • Aminoglycosides / therapeutic use
  • Anti-Bacterial Agents / administration & dosage
  • Anti-Bacterial Agents / adverse effects
  • Anti-Bacterial Agents / therapeutic use*
  • Bacteremia / drug therapy*
  • Bacteremia / epidemiology
  • Bacteremia / mortality*
  • Bacteremia / prevention & control
  • Cross Infection / drug therapy*
  • Cross Infection / microbiology
  • Cross Infection / mortality*
  • Cross Infection / prevention & control
  • Databases, Factual
  • Drug Resistance, Multiple, Bacterial*
  • Female
  • Fluoroquinolones / administration & dosage
  • Fluoroquinolones / adverse effects
  • Fluoroquinolones / therapeutic use
  • France / epidemiology
  • Humans
  • Intensive Care Units*
  • Male
  • Middle Aged
  • Pneumonia / drug therapy
  • Pneumonia / epidemiology
  • Pneumonia / microbiology
  • Pneumonia / mortality
  • Risk Factors
  • Treatment Outcome

Substances

  • Aminoglycosides
  • Anti-Bacterial Agents
  • Fluoroquinolones