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Updated: Aug 1, 2025
Long Term Chronic Pseudomonas aeruginosa Airway Infection in Mice
Published on: March 17, 2014
Pseudomonas aeruginosa in tracheal aspirate: Colonization, infection, and recurrence
Larissa Hermann de Souza Nunes1, João Felipe Bernardi Lora1, Luiz Augusto Fanhani Cracco1
1Laboratory of Emerging Infectious Diseases, School of Medicine, Pontifícia Universidade Católica do Paraná, Curitiba, Paraná, Brazil.
Introduction:
Pseudomonas aeruginosa respiratory infections are challenging, and the risk of recurrence is a frequent problem. The aim of this study was to investigate the risk factors associated with the presence of P. aeruginosa, and the risk factors related to the recurrence and death of lower airway infections in inpatients in a Brazilian hospital.
Methods:
Retrospective cohort with inpatients that had a sample of airways culture (tracheal aspirate or bronchoalveolar lavage) with the detection of P. aeruginosa. The patients with clinical criteria of infection were classified as ventilator-associated, hospital-acquired, or community-acquired pneumonia. P. aeruginosa in respiratory samples without symptoms was considered colonization. The antimicrobial treatment adequacy and the clinical data were evaluated. Outcome variables included mortality and recurrence.
Results:
One hundred and fifty-four patients were included in the study, most of them were men, and the majority (102) were considered infected. The average length of stay was superior to 30 days. Previous pulmonary disease was associated with the occurrence of colonization. Aminoglycosides were the most active drug according to susceptibility tests and were successfully used as monotherapy. Septic shock was a risk factor for death in the infected patients. The use of adequate antimicrobial therapy was associated with major survival, independent of the infection classification.
Conclusion:
It is possible to evaluate clinical data associated with recurrence and mortality in patients with different lung infections by P. aeruginosa. Aminoglycoside monotherapy is safe and effective in P. aeruginosa respiratory infections.
Insights
Pseudomonas aeruginosa respiratory infections are difficult to treat, with frequent recurrence. This study identified risk factors for P. aeruginosa infection, recurrence, and death, finding adequate antimicrobial therapy improves survival.
Area of Science:
- Medical Microbiology
- Infectious Diseases
- Clinical Epidemiology
Background:
- Pseudomonas aeruginosa respiratory infections pose significant challenges due to high recurrence rates.
- Identifying risk factors for P. aeruginosa infection, recurrence, and mortality is crucial for effective patient management.
Purpose of the Study:
- To investigate risk factors for P. aeruginosa presence and recurrence in lower airway infections among hospitalized patients.
- To determine factors associated with mortality in these patients.
Main Methods:
- Retrospective cohort study of inpatients with P. aeruginosa detected in airway cultures.
- Classification of pneumonia (ventilator-associated, hospital-acquired, community-acquired) and colonization.
- Evaluation of antimicrobial treatment adequacy and clinical data, with mortality and recurrence as outcomes.
Main Results:
- Previous pulmonary disease correlated with P. aeruginosa colonization.
- Septic shock was a significant risk factor for mortality in infected patients.
- Adequate antimicrobial therapy was independently associated with improved survival.
Conclusions:
- Clinical data can effectively assess recurrence and mortality risks in P. aeruginosa lung infections.
- Aminoglycoside monotherapy demonstrated safety and efficacy for P. aeruginosa respiratory infections.
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