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Prediction of ventilator-associated pneumonia outcomes according to the early microbiological response: a retrospective observational study
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Ventilator-associated pneumonia is a leading infectious cause of morbidity in critically ill patients; yet current guidelines offer no indications for follow-up cultures.We aimed to evaluate the role of follow-up cultures and microbiological response 3 days after diagnosing ventilator-associated pneumonia as predictors of short- and long-term outcomes.We performed a retrospective analysis of a cohort prospectively collected from 2004 to 2017. Ventilator-associated pneumonia was diagnosed based on clinical, radiographic, and microbiological criteria. For microbiological identification, a tracheobronchial aspirate was performed at diagnosis and repeated after 72?h. We defined three groups when comparing the two tracheobronchial aspirate results: persistence, superinfection, and eradication of causative pathogens.One-hundred-fifty-seven patients were enrolled in the study, among whom microbiological persistence, superinfection, and eradication was present in 67 (48%), 25 (16%), and 65 (41%), respectively, after 72hs. Those with superinfection had the highest mortalities in the intensive care unit (p=0.015) and at 90?days (p=0.036), while also having the fewest ventilation-free days (p=0.024). Multivariable analysis revealed shock at VAP diagnosis (odds ratios [OR] 3.43; 95% confidence interval [CI] 1.25 to 9.40), Staphylococcus aureus isolation at VAP diagnosis (OR 2.87; 95%CI 1.06 to 7.75), and hypothermia at VAP diagnosis (OR 0.67; 95%CI 0.48 to 0.95, per +1°C) to be associated with superinfection.Our retrospective analysis suggests that ventilator-associated pneumonia short-term and long-term outcomes may be associated with superinfection in follow-up cultures. Follow-up cultures may help guiding antibiotic therapy and its duration. Further prospective studies are necessary to verify our findings.
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CECCATO, Adrian, DOMINEDÒ, Cristina, FERRER MONREAL, Miquel, MARTÍN LOECHES, Ignacio, BARBETA, Enric, GABARRÚS, Albert, CILLÓNIZ, Catia, RANZANI, Otavio t., PASCALE, Gennaro de, NOGAS, Stefano, DI GIANNATALE, Pierluigi, ANTONELLI, Massimo, TORRES MARTÍ, Antoni. Prediction of ventilator-associated pneumonia outcomes according to the early microbiological response: a retrospective observational study. _European Respiratory Journal_. 2021-NA. [consulta: 24 de gener de 2026]. ISSN: 1399-3003. [Disponible a: https://hdl.handle.net/2445/184992]