Screening nasal swabs for methicillin resistant Staphylococcus aureus: A regional burn center's experience

- Positive screening MRSA incidence is about 4% in an urban burn center.
- Patients who screen positive for MRSA may have worse outcomes.
- Patients who screen positive for MRSA may have increased burn wound infections.

BackgroundMethicillin-resistant Staphylococcus aureus (MRSA) is a pathogen that can result in substantial morbidity and mortality. Early detection of MRSA colonization by screening nasal swabs may be important in the management of burn-injured patients. However, studies examining its use in this population are limited. The aim of this study was to study the utility of admission MRSA screening nasal swabs and determine if being positive for MRSA on admission impacted outcomes.Materials and methodsA retrospective review was conducted of burn patients who presented to a single regional burn center between June 2012 and December 2014. Electronic medical records and charts were reviewed for patient demographics and management. MRSA screening swabs were obtained from the anterior nares of burn patients upon admission. Patients without a MRSA nasal swab within 48 h of admission were excluded. Outcomes analyzed included overall length of stay, ICU admission and length of stay, mechanical ventilation, procedure count, time to excision, and wound complications after normalizing to total body surface area burn size (%TBSA).ResultsDuring the study period, 601 patients received a MRSA screening nasal swab upon admission. Of these, 24 patients screened positive for MRSA (4%). Patients who screened positive for MRSA had a significantly increased mean length of stay (3.95 v 2.36 days; p < 0.05) and number of surgical procedures (1.92 v 1.06; p < 0.05). Positively screened patients also had a higher proportion of wound infections (50% v 18.2%; p < 0.05), half of which were caused by MRSA. Subsequent graft complications were seen in 50% of patients with a wound complication. Only 2 positively screened patients were started on empiric antibiotics.ConclusionsBurn patients who screened positive for MRSA had greater lengths of stay, more surgical procedures, and higher wound complications. Early identification of MRSA colonized patients in this patient population might allow for treatment modifications that improve outcomes. Further study is warranted in a prospective clinical trial.