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Ventilator temperature sensors: an unusual source of Pseudomonas cepacia in nosocomial infection
P Berthelot1, F Grattard, P Mahul
1Department of Microbiology, Faculty of Medicine J. Lisfranc, University of Saint-Etienne, France.
Abstract:
A prospective study was undertaken to determine the source of Pseudomonas cepacia colonization and infection that had affected ventilated patients in an Intensive Care Unit (ICU) for three years. Thirty-eight patients undergoing mechanical ventilation were enrolled during a six-week period. Samples were taken from patients, ventilator circuits and the environment for culture. P. cepacia was isolated from the condensate formed in the ventilator circuit and the source of the contamination was shown to be the temperature sensor. Ribotyping of the representative strains of P. cepacia performed with two endonucleases, EcoRI and PvuII, confirmed the homogeneity of the isolates from patients and ventilator circuits. A modification of the procedure for disinfection of the temperature sensors resulted in the eradication of P. cepacia from the ICU.
Insights
Pseudomonas cepacia ICU infections were traced to ventilator temperature sensors. Modifying disinfection protocols eradicated the bacteria, improving patient safety in the Intensive Care Unit (ICU).
Area of Science:
- Infectious Diseases
- Critical Care Medicine
- Microbiology
Background:
- Ventilator-associated infections pose a significant risk to Intensive Care Unit (ICU) patients.
- Pseudomonas cepacia colonization and infection have been a persistent issue in this ICU for three years.
Purpose of the Study:
- To identify the source of Pseudomonas cepacia contamination in ventilated patients.
- To investigate the link between environmental factors and patient infections.
Main Methods:
- Prospective study involving 38 mechanically ventilated patients over six weeks.
- Sample collection from patients, ventilator circuits, and the ICU environment for microbial culture.
- Ribotyping using EcoRI and PvuII endonucleases to confirm strain homogeneity.
Main Results:
- Pseudomonas cepacia was isolated from ventilator circuit condensate.
- The temperature sensor was identified as the primary source of contamination.
- Ribotyping confirmed patient and ventilator isolates were genetically identical.
- Modified disinfection of temperature sensors eliminated P. cepacia from the ICU.
Conclusions:
- Ventilator temperature sensors are a critical reservoir for Pseudomonas cepacia.
- Effective disinfection protocols are essential for preventing and eradicating P. cepacia outbreaks in ICUs.
- Targeted environmental disinfection can significantly improve patient outcomes and reduce healthcare-associated infections.