Infection control properties of some wound dressings

The ability of some wound dressings to sequester and retain micro-organisms associated with wound fluid is perceived to provide beneficial properties regarding infection control. This study used an in vitro model to investigate and compare such properties in a range of fibrous absorbent dressings (alginate, hydrofibre and hydrophobic). Dressings were challenged with a simulated wound fluid containing common wound pathogens (Staphylococcus aureus or Pseudomonas aeruginosa). Bacterial sequestering and binding levels were monitored over time. A hydrofibre dressing and two calcium alginate dressings were shown to effectively sequester challenge organisms from a simulated wound fluid. However, the hydrophobic and hydrofibre dressings produced statistically significant results in their ability to adsorb and retain challenge organisms (p < 0.05). These investigations have demonstrated that a hydrofibre dressing effectively sequesters and retains micro-organisms upon exposure to simulated wound fluid, and may therefore provide a passive mechanism for reducing the microbial load in wounds and in the surrounding environment. Further in vivo studies are required to investigate these dressing properties.