Does Silver Dressing Improve Equine Leg Wound Healing?

Wounds treated with the SPF dressing had significantly decreased wound areas and granulation tissue scores.
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When it comes to healing horse wounds many owners will try any and everything to help the defect recover quickly—regardless of whether the product has scientific backing. Recently, researchers put some evidence behind one type of wound dressing: silver sodium zirconium phosphate polyurethane foam wound dressing, or, more simply, SPF dressing.

Maureen Kelleher, DVM, Dipl. ACVS, of the San Dieguito Equine Group in San Marcos, Calif., recently evaluated the SPF dressing’s impact on equine wound healing, and she presented her results at the 2013 American Association of Equine Practitioners’ Convention, held Dec. 7-11 in Nashville, Tenn.

The dressing is a semi-occlusive (meaning water and gas can still pass through while the wound is protected) polyurethane-based foam that includes ionic silver exchange resin and antimicrobial dyes believed to be useful in managing open wounds, Kelleher said. She and her team set out determine if the dressing improved second-intention healing (leaving a wound open to heal, rather than suturing it) of experimentally induced wounds on horses’ lower limbs.

Kelleher and colleagues created 1 inch square wounds on each of six horses’ forelimbs—one of each horse’s legs served as a control and the other was treated with the SPF foam. Then they bandaged each leg, adding a 1 inch square pad with SPF foam to the test legs’ wraps. The team changed the bandages every three days until the wound had healed and collected aerobic culture swabs on days the wraps were changed

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Erica Larson, former news editor for The Horse, holds a degree in journalism with an external specialty in equine science from Michigan State University in East Lansing. A Massachusetts native, she grew up in the saddle and has dabbled in a variety of disciplines including foxhunting, saddle seat, and mounted games. Currently, Erica competes in eventing with her OTTB, Dorado.

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