Clinical significance of nosocomial acquisition in urinary tract-related bacteremia caused by gram-negative bacilli

Am J Infect Control. 2011 Mar;39(2):135-40. doi: 10.1016/j.ajic.2010.03.022. Epub 2010 Dec 22.

Abstract

Background: Although hospital-acquired infections presumably may have a poorer prognosis than community-onset infections because of unanticipated antimicrobial resistance, little data are available on the clinical and microbiological characteristics of hospital-acquired versus community-onset urinary tract-related bacteremia cases.

Methods: Data were collected from a nationwide database of surveillance for bacteremia. Data from patients with hospital-acquired urinary tract-related bacteremia were compared with those with community-onset bacteremia.

Results: Of 398 patients with urinary tract-related bacteremia, 71 (17.8%) had hospital-acquired infection, and the remaining 327 (82.2%) had community-onset infection. Although Escherichia coli was the most common isolate identified, pathogens other than E coli were more frequently isolated in hospital-acquired infections than in community-onset infections (46.5% vs 19.3%). Among E coli isolates causing hospital-acquired infections, 26.3% (10 of 38) were resistant to extended-spectrum cephalosporins (ESCs), whereas among E coli isolates causing community-onset infections, only 6.1% (16 of 264) were ESC-resistant. Hospital-acquired infection had a significantly higher mortality rate than community-onset infection (21.1% [15 of 71] vs 8.3% [27 of 327]; P = .004). Multivariate analysis identified nosocomial acquisition as a significant independent risk factor for mortality, along with severe sepsis, underlying solid tumor, ESC resistance, and high Pitt bacteremia score (all P < .05).

Conclusion: Hospital-acquired urinary tract-related bacteremia has a poorer prognosis than community-onset bacteremia. The ESC-resistant nature of gram-negative bacilli, which may be more common in nosocomial isolates than in community isolates, adversely affects the outcome of urinary tract-related bacteremia.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Bacteremia / epidemiology
  • Bacteremia / mortality
  • Community-Acquired Infections / epidemiology
  • Community-Acquired Infections / microbiology*
  • Community-Acquired Infections / mortality
  • Cross Infection / epidemiology
  • Cross Infection / microbiology*
  • Cross Infection / mortality
  • Drug Resistance, Bacterial
  • Female
  • Gram-Negative Bacteria / isolation & purification
  • Gram-Negative Bacterial Infections / epidemiology
  • Humans
  • Male
  • Middle Aged
  • Republic of Korea / epidemiology
  • Treatment Outcome
  • Urinary Tract Infections / epidemiology
  • Urinary Tract Infections / microbiology*
  • Urinary Tract Infections / mortality