Relationship between immunosuppression and intensive care unit-acquired multidrug-resistant bacteria: a case-control...

Area of Science:

• Infectious Diseases
• Critical Care Medicine
• Microbiology

Background:

• Intensive care unit (ICU)-acquired multidrug-resistant (MDR) bacteria pose a significant threat to patient safety.
• Understanding risk factors for MDR bacteria acquisition is crucial for effective infection control.

Purpose of the Study:

• To investigate the association between immunosuppression and the development of ICU-acquired MDR bacteria.
• To identify independent risk factors for MDR bacteria acquisition in the ICU.

Main Methods:

• Retrospective case-control study utilizing prospectively collected data from a 30-bed medical and surgical ICU.
• Immunosuppression defined by malignancy, leucopenia, or immunosuppressive treatment; MDR bacteria defined by specific resistance profiles.
• Patients were matched based on age, severity of illness, ICU stay duration, and admission category; risk factors analyzed using univariate and multivariate methods.

Main Results:

• The incidence of MDR bacteria was higher in immunosuppressed patients (cases) compared to immunocompetent patients (controls) (22 vs. 12 per 1000 ICU days, p = .004).
• Immunosuppression was not found to be an independent risk factor for ICU-acquired MDR bacteria.
• Prior antibiotic treatment (OR 1.9) and antibiotic treatment within the ICU (OR 11) were identified as significant independent risk factors.

Conclusions:

• Immunosuppression is not independently associated with ICU-acquired MDR bacteria, suggesting other factors play a more significant role.
• Strict infection control measures implemented in the ICU may have mitigated the impact of immunosuppression on MDR bacteria acquisition.