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Acquisition, spread, and control of Pseudomonas aeruginosa in a cardiothoracic intensive care unit
Abstract:
The isolation rate and spread of infection and colonisation with Pseudomonas aeruginosa in a cardiothoracic intensive care unit was studied over two and a half years. The overall acquisition rate was low (2.68%) and was concentrated in the group of patients undergoing prolonged intensive care (over seven days). Although some cross-infection from long-stay to short-stay patients occurred in 1978 and 1979, when cubicle isolation was inadequate, acquisition of Ps aeruginosa was confined to the long-stay group when isolation facilities became sufficient. Further study of the long-stay patients disclosed two factors--use of broad-spectrum antibiotics and tracheostomy--significantly associated with acquisition of Ps aeruginosa. The possible uses of the results obtained and the particular relevance of a policy of narrow-spectrum chemoprophylaxis for open-heart surgery are discussed.
Insights
Pseudomonas aeruginosa acquisition in cardiothoracic ICUs is low, primarily affecting long-stay patients. Key risk factors include broad-spectrum antibiotics and tracheostomy, suggesting targeted infection control strategies.
Area of Science:
- Infectious Diseases
- Critical Care Medicine
- Microbiology
Background:
- Pseudomonas aeruginosa is a significant nosocomial pathogen, particularly in intensive care units.
- Understanding acquisition patterns is crucial for effective infection control in vulnerable patient populations.
- Cardiothoracic intensive care units (ICUs) present unique challenges for managing infections due to patient acuity.
Purpose of the Study:
- To investigate the isolation rate and spread of Pseudomonas aeruginosa in a cardiothoracic ICU over 2.5 years.
- To identify patient groups and risk factors associated with Pseudomonas aeruginosa acquisition.
- To evaluate the impact of isolation measures on infection control.
Main Methods:
- Prospective study over two and a half years in a cardiothoracic intensive care unit.
- Monitoring of Pseudomonas aeruginosa isolation rates and patient demographics.
- Analysis of patient care factors, including duration of ICU stay, antibiotic use, and tracheostomy.
Main Results:
- Overall acquisition rate of Pseudomonas aeruginosa was low at 2.68%.
- Acquisition was concentrated in patients requiring prolonged intensive care (over seven days).
- Broad-spectrum antibiotic use and tracheostomy were significantly associated with Pseudomonas aeruginosa acquisition in long-stay patients.
- Improved isolation facilities correlated with the confinement of acquisition to the long-stay patient group.
Conclusions:
- Pseudomonas aeruginosa acquisition in cardiothoracic ICUs can be effectively controlled with adequate isolation measures.
- Long-stay patients, particularly those on broad-spectrum antibiotics or with tracheostomies, are at highest risk.
- Narrow-spectrum chemoprophylaxis for open-heart surgery may be a relevant infection control strategy.