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  • Poster presentation
  • Open Access

Impact of the adequacy of antibiotic therapy on the outcome of ventilator-associated pneumonia

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Critical Care201115 (Suppl 1) :P220

  • Published:


  • Antibiotic Therapy
  • Empiric Antibiotic Therapy
  • Stenotrophomonas Maltophilia
  • Acinetobacter Baumanii
  • Inadequate Therapy


The aim was to assess the impact of empiric antibiotic adequacy on ICU outcome of patients with ventilator-associated pneumonia (VAP), the reasons for inadequacy and risk factors for potential multidrug-resistant organisms.


During a 24-month period a multiple-centre observational study was conducted in five ICUs. Adult patients with documented VAP were segregated for analysis. Empiric antibiotic therapy was classified as adequate or inadequate according to in vitro efficacy against all isolated bacteria. The day of ICU discharge or death was recorded. Comparison between survivors and nonsurvivors was performed. Infection with potential multidrug-resistant organisms (methicillin-resistant Staphylococcus aureus, Pseudomonas aeruginosa, Acinetobacter baumanii or Stenotrophomonas maltophilia) was evaluated for therapeutic inadequacy, ICU length of stay before diagnosis and previous use of antibiotics.


One hundred and twenty-three patients with VAP (age 62.7 ± 16.9 years, 65.9% men, and SAPS II 49.5 ± 15.5) were identified. Empiric antibiotic therapy was adequate in 65.9%. These patients' ICU mortality was significantly lower in comparison with those with inadequate therapy (28.4% vs. 45.2%, P = 0.049). Patients infected with a potential multidrug-resistant organism were more likely to receive inadequate antibiotic therapy (80.1%, P = 0.001), and to have had longer previous ICU stay (11.5 days vs. 7.2 days, P = 0.005), but there was no difference in the previous use of antibiotics (65.2% vs. 50%, P = 0.102).


An empiric adequate antibiotic therapy was associated with a lower mortality rate in VAP. Multidrug-resistant organisms were significantly associated with therapeutic inadequacy and longer ICU length of stay.

Authors’ Affiliations

Hospital Sao Francisco Xavier, Lisboa, Portugal
Hospital Sao Jose, Lisboa, Portugal
Hospital Sao Bernardo, Setubal, Portugal
Hospital Santo António, Porto, Portugal
Centro Hospitalar Médio Tejo, Abrantes, Portugal


© Goncalves-Pereira et al. 2011

This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.