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Methicillin-resistant Staphylococcus aureus in a general intensive care unit.
1Medway Maritime Hospital, Gillingham ME7 5NY, UK. david.thompson@medway.nhs.uk
Journal of the Royal Society of Medicine
|November 3, 2004
Summary
Methicillin-resistant Staphylococcus aureus (MRSA) is a significant concern in intensive care units (ICUs). This study found nearly 10% of ICU admissions were MRSA-positive, with a substantial risk of acquisition during extended stays.
Area of Science:
- Infectious Diseases
- Critical Care Medicine
- Microbiology
Background:
- Methicillin-resistant Staphylococcus aureus (MRSA) poses challenges in intensive care units (ICUs) due to difficulties in infection control.
- Understanding MRSA prevalence and acquisition is crucial for effective patient management in high-risk settings.
Purpose of the Study:
- To investigate the prevalence and acquisition rates of MRSA in a general ICU over a 30-month period.
- To identify risk factors associated with MRSA acquisition and colonization in ICU patients.
Main Methods:
- Prospective study involving 1361 admissions to a nine-bed ICU over 30 months.
- Weekly nasal and groin swabs, plus cultures as clinically indicated, were performed.
- Data analysis included MRSA status on admission, acquisition during ICU stay, and patient demographics.
Main Results:
- Nearly 10% of ICU admissions were MRSA-positive on arrival; only half were identified pre-discharge.
- 68 out of 1242 initially negative admissions acquired MRSA in the ICU, with risk increasing with length of stay.
- The daily risk of MRSA acquisition was approximately 1% in the first week and 3% thereafter; nearly 20% developed bacteremia.
Conclusions:
- A significant proportion of ICU patients are admitted with or acquire MRSA, highlighting the need for enhanced surveillance and control.
- Longer ICU stays identify a high-risk group for MRSA acquisition, suggesting targeted interventions like vancomycin decontamination may be beneficial.
- Standard prevention measures may be insufficient, necessitating consideration of additional strategies for high-risk patients to reduce MRSA transmission and infection.