Absorbable, delayed-release antibiotic beads reduce surgical wound infection

Area of Science:

• Biomaterials Science
• Infectious Diseases
• Surgical Innovation

Background:

• Wound infections pose significant clinical challenges, necessitating effective local delivery systems for antibiotics.
• Polyglycolic acid (PGA) is an absorbable polymer with potential as a drug delivery vehicle.
• Optimizing local antibiotic delivery can enhance treatment efficacy and minimize systemic side effects.

Purpose of the Study:

• To evaluate absorbable polyglycolic acid (PGA) beads as a novel local delivery system for antibiotics in contaminated wounds.
• To compare the efficacy of local antibiotic delivery via PGA beads versus systemic administration in a guinea pig wound infection model.

Main Methods:

• Guinea pig dorsal wounds were contaminated with Escherichia coli and Staphylococcus aureus.
• PGA beads loaded with minocycline or amikacin, or placebo beads, were implanted into wounds.
• Wound erythema, bacterial load, and antibiotic concentrations were assessed over seven days.
• Comparison was made with systemic minocycline or amikacin treatment.

Main Results:

• Antibiotic-loaded PGA beads significantly reduced wound erythema compared to placebo (P < 0.05).
• Wounds treated with antibiotic-PGA beads healed primarily, while placebo wounds showed purulence and secondary healing.
• Local antibiotic delivery via PGA beads was more effective than systemic administration in reducing bacterial counts.
• Antibiotic concentrations were measurable in wounds for up to three days, with no detectable serum levels.

Conclusions:

• Absorbable, antibiotic-eluting PGA beads represent an effective strategy for preventing infection in contaminated wounds.
• Local delivery of antibiotics using PGA beads offers advantages over systemic administration, including enhanced efficacy and localized action.
• This approach avoids the need for vehicle removal, simplifying clinical application.