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Slough or Purulent Wound Drainage: How to Tell the Difference


Identifying Slough

To achieve the best healing result for a patient, you need to be able to accurately assess the wound then determine which is the right course of action for treatment. A key ingredient used in this recipe for success is assessing if the wound bed is plagued with wet necrotic tissue, also known to be slough, or dry necrotic tissue. As you conduct your investigation, first identify if the wound bed shows signs of slough. This can easily be determined if the wound has a stringy texture, is yellow or white in color, and is moist in nature.


A common remedy for treating slough is debridement. Here are some common debridement treatments to use on slough tissue:


As debridement occurs, slough will naturally liquify causing clinicians to incorrectly document this as purulent drainage. An easy way to determine if the wound is still exhibiting signs of slough and not purulence is the odor.


Wounds generally give off an odor while draining, so it’s imperative to remove and dispose of the old dressing first then cleanse the wound thoroughly before documenting the wound’s state. After completing this step and the wound continues to emit an odor, then it’s appropriate to document the wound as malodorous.



Purulence and Infection

If a wound is exhibiting purulence, it’s more than likely plagued with pus indicating an infection. An easy way to identify the signs and symptoms of purulence infection are:

  • Erythema

  • Odor

  • Redness that does not improve with elevation of affected limb

  • Pain

  • Changes in drainage (color, thickness, and amount)

  • Fever, chills, nausea, vomiting (systemic)



Conclusion

Determining if a wound bed is plagued with slough, purulence, or sometimes both can be challenging, but cleansing the wound bed thoroughly before making any observations or conclusions will help to differentiate which wound type you are encountering. Slough will always show signs of stringy textures, yellow coloring, and will be more granular after cleansing. Purulence will always emit an odor after cleansing and will show signs of infection and erythema.



Other helpful tips to keep in mind when examining the wound bed:



When in doubt, consult with the Cork Medical wound care team for further evaluation. Contact us at 866.551.2580 or complete our request form.

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