• Anesthesiology · Oct 2006

    Risk factors for ventilator-associated pneumonia by Pseudomonas aeruginosa in presence of recent antibiotic exposure.

    • Jordi Rello, Camilla Allegri, Alejandro Rodriguez, Loreto Vidaur, Gonzalo Sirgo, Frederic Gomez, Kemal Agbaht, Angel Pobo, and Emili Diaz.
    • Critical Care Department, Joan XXIII University Hospital, University Rovira & Virgili, Institut Pere Virgili, Carrer Dr. Mallafre Guasch 4, 43007 Tarragona, Spain. jordi.rello@urv.cat
    • Anesthesiology. 2006 Oct 1; 105 (4): 709-14.

    BackgroundTo facilitate the decision-making process for therapy and prevention of ventilator-associated pneumonia (VAP) in patients undergoing recent antibiotic exposure, this study investigated whether the development of VAP episodes caused by Pseudomonas aeruginosa or other pathogens are related to different risk factors, thereby distinguishing two risk population for this serious complication.MethodsA 5-year retrospective case-control observational study was conducted. Cases of VAP caused by P. aeruginosa were compared with those caused by other pathogens. Univariate and multivariate analysis was performed using SPSS 11.0 software (SPSS Inc., Chicago, IL).ResultsTwo groups were identified: P. aeruginosa (group P) was isolated in 58 (63.7%) episodes, and 33 episodes served as controls (group C), after a median of 12 days (interquartile range, 4-28 days) and 9 days (interquartile range, 3-12.5 days) of mechanical ventilation, respectively. P. aeruginosa was identified in 34.7% of episodes with early-onset pneumonia and in 73.5% with late-onset pneumonia. In a logistic regression analysis, P. aeruginosa was independently associated with duration of stay of 5 days or longer (relative risk = 3.59; 95% confidence interval, 1.04-12.35) and absence of coma (relative risk = 8.36; 95% confidence interval, 2.68-26.09). Risk for pathogens different from P. aeruginosa (group C) in early-onset pneumonia associated with coma was estimated to be 87.5%.ConclusionsRisk factors in episodes under recent antibiotic treatment caused by P. aeruginosa or other microorganism are not the same, a fact that could have implications for preventive and therapeutic approaches for this infection.

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