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Preoperative nasal methicillin-resistant Staphylococcus aureus status, surgical prophylaxis, and risk-adjusted

Kalpana Gupta1, Judith Strymish, Youmna Abi-Haidar

  • 1Department of Medicine, Veterans Affairs Boston Healthcare System, Boston, Massachusetts, 02132, USA. kalpana.gupta@va.gov

Infection Control and Hospital Epidemiology
|July 20, 2011
PubMed
Abstract

Insights

Preoperative nasal methicillin-resistant Staphylococcus aureus (MRSA) carriage significantly predicts postoperative MRSA infections. Vancomycin prophylaxis increased surgical site infection risk in patients without nasal MRSA, highlighting the importance of MRSA screening.

Area of Science:

  • Infectious Diseases
  • Surgical Infections
  • Microbiology

Background:

  • Methicillin-resistant Staphylococcus aureus (MRSA) is a significant cause of healthcare-associated infections.
  • Nasal carriage of MRSA is a known risk factor for subsequent MRSA infections.
  • Understanding predictors of postoperative infections is crucial for patient safety.

Purpose of the Study:

  • To evaluate preoperative nasal MRSA carriage as a predictor of postoperative infections.
  • To assess the association between nasal MRSA and MRSA-related clinical cultures and surgical site infections (SSIs).
  • To determine the impact of surgical prophylaxis on infection risk in relation to MRSA carriage.

Main Methods:

  • Retrospective cohort study of 4,238 patients undergoing clean or clean-contaminated surgery.
  • Nasal MRSA screening using polymerase chain reaction (PCR) prior to surgery.
  • Analysis of postoperative MRSA clinical cultures, SSIs, and surgical prophylaxis data using multivariate regression.

Main Results:

  • Preoperative nasal MRSA carriage (6.6% of patients) was independently associated with increased postoperative MRSA cultures (RR 8.81) and infections (RR 8.46).
  • Vancomycin prophylaxis was linked to a higher risk of total SSI in patients negative for nasal MRSA (RR 4.34).
  • This association between vancomycin and SSI risk was not observed in patients positive for nasal MRSA.

Conclusions:

  • Preoperative nasal MRSA colonization is an independent predictor of postoperative MRSA infections.
  • Surgical prophylaxis strategies may need to be tailored based on MRSA screening results.
  • MRSA screening can inform risk stratification and infection prevention in surgical patients.

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