Risk factors for methicillin-resistant Staphylococcus aureus surgical site infection

Area of Science:

• Infectious Diseases
• Surgical Outcomes
• Healthcare Epidemiology

Background:

• Methicillin-resistant Staphylococcus aureus (MRSA) is a significant pathogen causing healthcare-associated infections.
• Surgical site infections (SSIs) are a common complication following surgical procedures.
• Understanding risk factors for MRSA SSI is crucial for prevention strategies.

Purpose of the Study:

• To identify risk factors for developing MRSA SSI in patients with known MRSA carriage.
• To evaluate the predictive value of MRSA carriage on admission for subsequent MRSA SSI.

Main Methods:

• Prospective evaluation of 46 potential risk factors in a large intervention study.
• Analysis of data from 6,130 patients, including those with MRSA carriage.
• Identification of factors associated with MRSA SSI development.

Main Results:

• MRSA SSI developed in 68 (1.1%) patients, with a median onset of 14 days post-surgery.
• Significant risk factors included emergency surgery, comorbid conditions, immunosuppressive therapy, contaminated surgery, and prolonged surgical duration (>75th percentile).
• MRSA carriage upon admission was not found to be a predictor of MRSA SSI.

Conclusions:

• Several factors beyond MRSA carriage influence the risk of developing MRSA SSI.
• Targeted interventions for patients undergoing emergency or prolonged surgeries, or those with comorbidities, may reduce MRSA SSI rates.
• Pre-operative MRSA carriage status alone is insufficient to predict SSI risk.