In a patient colonised with methicillin‑resistant Staphylococcus aureus (MRSA) undergoing functional endoscopic sinus surgery (FESS), what pre‑operative decolonisation and peri‑operative antibiotic prophylaxis should be used?

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Pre-operative Decolonization for MRSA-Colonized Patients Undergoing FESS

For MRSA-colonized patients undergoing functional endoscopic sinus surgery (FESS), implement pre-operative decolonization with intranasal mupirocin 2% twice daily for 5 days combined with chlorhexidine gluconate body wash (40 mg/mL) daily, completing the regimen 1-2 weeks before surgery. 1

Decolonization Protocol

The 2024 European guidelines provide a conditional recommendation for decolonization with mupirocin (MUP) with or without chlorhexidine (CHX) for surgeries beyond cardiac and orthopedic procedures 1. While FESS is not among the surgeries with the strongest evidence (cardiac and orthopedic have strong recommendations), the combination therapy is justified given:

  • Mupirocin 2% nasal ointment: Apply twice daily to each nostril for 5 days
  • Chlorhexidine gluconate soap (40 mg/mL): Daily bathing during the same 5-day period
  • Timing: Complete decolonization 1-2 weeks before surgery 1

The combination of mupirocin plus chlorhexidine demonstrates superior efficacy compared to mupirocin alone, with high-quality evidence showing a 68% reduction in S. aureus-related surgical site infections (risk ratio 0.32,95% CI: 0.16-0.62) 2.

Critical Timing Considerations

If the 5-day decolonization course cannot be completed pre-operatively, complete it post-surgery rather than abandoning the protocol 1. For elective FESS, consider postponing the procedure to allow complete decolonization if this poses no additional patient risk 1.

Duration matters: longer pre-operative decolonization therapy correlates with decreased postoperative MRSA colonization (OR 0.73,95% CI: 0.53-1.00) 3.

Peri-operative Antibiotic Prophylaxis

For MRSA-colonized patients undergoing FESS, add vancomycin (weight-based dosing) to standard cefazolin prophylaxis 4. This dual-agent approach is supported by neurosurgical data showing that vancomycin addition for MRSA carriers reduced surgical site infections even when decolonization was performed 4.

The rationale: Despite decolonization protocols, MRSA colonization remains associated with 2.4-fold increased risk of periprosthetic joint infection (OR 2.42,95% CI: 1.35-3.49) and 2.5-fold increased risk of surgical site infections (OR 2.54,95% CI: 1.86-3.21) after surgery 5. Decolonization alone does not normalize infection risk to that of non-colonized patients 5.

Important Caveats

Mupirocin Resistance Monitoring

Local surveillance for mupirocin resistance in colonizing isolates is essential, as resistance can develop with repeated or incomplete decolonization courses 1. Universal decolonization without screening may accelerate resistance emergence 1.

FESS-Specific Evidence Gap

The evidence for MRSA decolonization in FESS specifically is limited. One study of endoscopic endonasal procedures (primarily for skull base tumors) found no significant difference in meningitis rates based on MRSA/MSSA colonization status or pre-operative decolonization 6. However, this study examined meningitis rather than sinusitis or wound infections, and the overall infection rate was low (2.7%), potentially underpowering the analysis 6.

Standard Infection Control Remains Paramount

Decolonization supplements but does not replace fundamental surgical infection prevention: hand hygiene, sterile technique, and appropriate operating room protocols 1. Approximately 60% of MRSA infections in surgical patients are acquired postoperatively rather than from pre-existing colonization 1, emphasizing the importance of ongoing infection control measures.

Practical Implementation

  1. Screen for MRSA colonization within 30 days of planned FESS using nasal PCR or culture
  2. For MRSA-positive patients: Prescribe 5-day decolonization regimen (mupirocin + chlorhexidine) to complete 1-2 weeks pre-operatively
  3. Peri-operative prophylaxis: Administer both weight-based cefazolin AND weight-based vancomycin
  4. If decolonization incomplete pre-operatively: Complete the course post-operatively
  5. Monitor: Track local mupirocin resistance patterns and surgical site infection rates

This bundled approach—screening, decolonization, and enhanced prophylaxis—provides the most comprehensive risk reduction for MRSA-colonized patients undergoing FESS, even though the specific evidence base for sinus surgery is less robust than for cardiac or orthopedic procedures 1, 4, 2.

References

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