Wound Slough Management

Characteristics and Identification

Slough is commonly found in Stage III and IV pressure injuries, where it presents as a layer of dead tissue in the wound bed 1, 2
Slough should not be confused with biofilm, exudates, or other wound debris, though these may coexist in chronic wounds 1, 2
In wound assessment terminology, slough is specifically identified when staging pressure injuries, with Stage III and IV injuries potentially having slough present 1
Unstageable wounds are those where slough or eschar completely covers the base of a full-thickness wound, preventing determination of the wound depth 1

The presence of slough is associated with delayed wound healing and increased risk of infection 1, 2
Wounds with significant slough burden have higher bacterial loads, with each log10 increase in bacterial count associated with a 44% delay in healing time 1
80-90% of chronic wounds contain biofilm, which can develop within 10 hours of wound contamination and may coexist with slough 1, 2
Slough can contribute to an alkaline wound environment (pH 7.5-8.5), which further promotes bacterial growth and impairs healing 1

Sharp debridement is the preferred method for removing slough and necrotic tissue from wounds 3, 4, 5
Other methods of debridement for slough removal include autolytic (using hydrogels) 3, 4, biological (larval therapy) 4, 5, and enzymatic (collagenase) 4, 6
Dressings should be selected based on exudate control, comfort, and cost after slough removal 4, 5

Mistaking slough for biofilm can lead to inappropriate treatment strategies 1, 2
Failing to remove slough can result in increased risk of infection 1 and delayed wound healing 1, 2
Aggressive debridement in patients with severe ischemia or pain requires careful consideration of risks versus benefits 4, 5
Antimicrobial dressings should not be used with the sole aim of accelerating healing after slough removal 4, 5

McKesson hydrogel amorphous wound dressing contributes to debridement through autolytic debridement mechanisms, though it is not as effective as sharp debridement for removing slough and necrotic tissue 7

Sharp debridement is strongly recommended as the preferred method for removing slough, necrotic tissue, and surrounding callus from diabetic foot ulcers and other wounds 8, 7, 9
Three studies on hydrogel-based autolytic debridement suggest these agents may have a beneficial effect on ulcer healing compared to saline moistened gauze, but the risk of bias in these studies was high 7, 10
Current expert opinion recommends sharp debridement over other techniques, particularly as it is the least expensive method and available in all geographic areas 10, 11

Dressings should be selected principally on the basis of exudate control, comfort, and cost after considering the debridement needs of the wound 7, 9

The International Working Group on the Diabetic Foot (IWGDF) found insufficient good quality evidence to support one form of debridement over another, though expert opinion favors sharp debridement 10, 11

For wounds requiring rapid debridement, particularly those with infection risk, sharp debridement should be prioritized over hydrogel-based autolytic debridement 8, 10
Consider hydrogel dressings like McKesson's as an adjunctive treatment when sharp debridement is contraindicated (e.g., in cases of severe ischemia or pain) 7, 9
Do not rely solely on hydrogel dressings for debridement of heavily infected wounds or those with extensive necrotic tissue 7