Occlusive dressings. Does dressing type influence the growth of common bacterial pathogens?
D. A. Marshall, P. M. Mertz and W. H. Eaglstein
Department of Dermatology and Cutaneous Surgery, University of Miami School of Medicine, Fla.
We studied the effect of different occlusive dressings and of air exposure
on the growth of four pathogenic bacteria in wounds. Partial-thickness
wounds on domestic pigs were inoculated with Staphylococcus aureus,
Clostridium perfringens, Bacteroides fragilis, or Pseudomonas aeruginosa.
Each wound was covered with three dressings (DuoDERM, Opsite, or Vigilon),
or left exposed to air. Groups of wounds were sampled at 24, 48, and 72
hours. Staphylococcus aureus reached high levels beneath all of the
dressings and in the air-exposed wounds. The numbers of C perfringens and B
fragilis were greatly reduced in the air-exposed wounds and slightly
reduced in the Opsite-covered wounds. The numbers of P aeruginosa were
greatest in the Opsite- and Vigilon-covered wounds. The results indicate
that occlusive dressings are not indicated in wounds that clinically appear
to be grossly contaminated or that may contain anaerobic organisms.
