Multidrug-resistant Pseudomonas aeruginosa and mortality in mechanically ventilated ICU patients

Abstract

Background: The link between bacterial resistance and prognosis remains controversial. Predominant pathogen causing ventilator-associated pneumonia (VAP) is Pseudomonas aeruginosa (Pa), which has increasingly become multidrug resistant (MDR). The aim of this study was to evaluate the relationship between MDR VAP Pa episodes and 30-day mortality. Methods: From a longitudinal prospective French multicenter database (2010-2016), Pa VAP onset and physiological data were recorded. MDR was defined as non-susceptibility to at least 1 agent in 3 or more antimicrobial categories. To analyze if MDR episodes were associated with greater in-hospital 30-day mortality, we performed a multivariate survival analysis using the multivariate nonlinear frailty model. Results: A total of 230 patients presented 286 Pa VAP. A maximum of 3 episodes per patient was observed; 73 episodes were MDR and 213 were susceptible. In the multivariate model, factors independently associated with 30-day mortality included hospitalization in the 6 months preceding the first episode (hazard ratio [HR], 2.31; 95% confidence interval [CI], 1.50-3.60; P =.0002), chronic renal failure (HR, 2.34; 95% CI, 1.15-4.77; P =.0196), and Pa VAP recurrence (HR, 2.29; 95% CI, 1.79-4.87; P =.032). Finally, MDR Pa VAP was not associated with death (HR, 0.87; 95% CI; 0.52-1.45; P =.59). Conclusions: This study did not identify a relationship between the resistance profile of Pseudomonas aeruginosa and mortality.