Prophylactic antibiotics in open fractures: a pilot randomized clinical safety study

Area of Science:

• Infectious Diseases
• Orthopedic Surgery
• Clinical Trials

Background:

• Open fractures present a high risk for surgical site infections (SSIs), with Staphylococcus aureus being a common pathogen.
• Standard antibiotic prophylaxis may not adequately cover methicillin-resistant Staphylococcus aureus (MRSA), a significant cause of SSIs.

Purpose of the Study:

• To compare the efficacy of standard antibiotic prophylaxis versus a regimen including targeted MRSA coverage for preventing SSIs in open fracture patients.
• To assess Staphylococcus aureus colonization rates and their association with SSI development.

Main Methods:

• A randomized prospective clinical trial involving 130 adult patients with open fractures.
• Patients received either cefazolin alone or cefazolin plus vancomycin.
• S. aureus colonization was screened via nares and wound swabs; SSIs were monitored for up to 12 months.

Main Results:

• No significant difference in overall SSI rates between the two prophylaxis groups (15% vs 19%).
• Staphylococcus aureus accounted for 55% of deep incisional/organ space SSIs, with 18% attributed to MRSA.
• MRSA carriers had a significantly higher rate of MRSA SSIs (33% vs 1%, P = 0.003).

Conclusions:

• Staphylococcus aureus nasal colonization in trauma patients is comparable to the general population.
• Adding vancomycin to standard prophylaxis was safe but not proven effective in this pilot study.
• Larger multiinstitutional trials are needed to evaluate the efficacy of targeted MRSA coverage for open fracture SSIs.