Methicillin-resistant Staphylococcus aureus: acquisition and risk of death in patients in the intensive care unit.
OBJECTIVE
To evaluate the risk of patients in intensive care units (ICU) of becoming infected with methicillin-resistant Staphylococcus aureus (MRSA) and to assess the mortality during a six week follow-up period, compared with patients who developed methicillin-sensitive S. aureus (MSSA) infection.


METHODS
Point prevalence survey.


METHODS
1417 ICU in 17 Western European countries.


METHODS
10038 patients in ICU who were part in the EPIC (European Prevalence of Infection in Intensive Care) Study.


METHODS
Prevalence of MRSA and MSSA ICU-acquired infections, risk factors, and mortality.


RESULTS
On the study day 21% of patients had ICU-acquired infections. The most commonly reported pathogen was Staphylococcus aureus (30%). Overall, 60% of strains of S. aureus were resistant to methicillin (with a wide intercountry variation). The most commonly reported MRSA infections were pneumonia and lower respiratory tract infections. The most important risk factor for MRSA was the length of stay in the ICU. MRSA infection reduced the chance of survival, particularly when it was found in lower respiratory tract infections: the risk of mortality was three times higher in patients with MRSA than in those with MSSA.


CONCLUSIONS
Patients in ICU are at high risk of becoming infected with MRSA. The longer they stay, the higher the risk. Patients with MRSA infections are less likely to survive than those with MSSA.
Ibelings
M M
MM
Department of Surgery, University Hospital Rotterdam Dijkzigt, The Netherlands.
Bruining
H A
HA
D003428:Cross Infection / Q000401:mortality*; D006801:Humans; D007362:Intensive Care Units; D007902:Length of Stay; D016106:Methicillin Resistance; D011014:Pneumonia / Q000401:mortality; D012141:Respiratory Tract Infections / Q000401:mortality; D012307:Risk Factors; D013203:Staphylococcal Infections / Q000401:mortality* / Q000635:transmission*; D013211:Staphylococcus aureus / Q000187:drug effects / Q000472:pathogenicity; D014774:Virulence