Does MRSA affect patient outcomes in the elderly? A retrospective pilot study

We retrospectively studied admissions to our geriatric acute assessment and rehabilitation ward over a one-year period, to identify those with Methicillin-resistant Staphylococcus aureus (MRSA) and determine whether this affected outcomes. Two hundred and thirty eight admissions of 204 patients were analysed and 9.8% of patients were MRSA positive. Demographics did not differ between MRSA positive and negative patients. Respiratory co-morbidity was more common in MRSA positive patients. Rates of functional decline did not differ between the two groups. Those colonized or infected by MRSA had a significantly longer stay (51.4 vs. 32.2 days, P=0.03), perhaps due to isolation and limited rehabilitation. The virulence of MRSA may be less in these patients, therefore isolation may be inappropriate and counter-productive.