Slough as a Biologically Active Barrier to Healing 

Slough is a common feature of wounds, composed mainly of accumulating devitalized tissue that varies in clinical presentation, with ranges of color, texture, thickness, and adherence.^1,2 Slough has previously been described as non-functional tissue in the wound bed; however, our more recent understanding of slough has evolved into far more than just passive debris requiring debridement.¹ In fact, research has shown that slough is its own biologically active structure and its composition is associated with delayed wound healing.¹  

From a molecular perspective, slough is comprised of a complex and heterogenous mixture of components such as collagen, fibrin, extracellular matrix proteins, white blood cells, proteases, and microbial elements.^1,2 Slough can also have high concentrations of proinflammatory cytokines, which are indicative of a prolonged inflammatory environment that may be related to stalled wound healing.^1,2 Slough composition can vary based on the location on the body, wound type (acute vs hard-to-heal), and whether it is adherent devitalized tissue or tenaciously attached polymerized exudates.^1,2 

While slough is a common feature of both acute and chronic/hard-to-heal wounds, its presence and role in each type of wound greatly differ. Slough in healing wounds may contain harmless components that do not interfere with healing, but which can and should be removed where possible. Slough is typically more problematic in chronic wounds where it is more abundant, inflammatory, difficult to remove, and prone to microbial survival and persistence.² Thus, removal of adherent or abundant slough in chronic/hard-to-heal wounds is essential to prevent complications, such as infection, and ultimately to promote wound healing.  

Translating Slough Pathophysiology Into Clinical Decision-Making 

From a clinical standpoint, slough signals the need for targeted assessment and swift action. Effective wound management requires accurate assessment of the wound and possible/potential associated local infection.^3,4 Early recognition and intervention for removal of slough as well as continuous monitoring is essential along the continuum of care for patients with chronic/hard-to-heal wounds.² The presence of slough in chronic wounds indicates that the wound environment requires intervention to reduce inflammatory burden and microbial load, with the goal of preserving viable tissue. As slough contains microbial and host components that can ultimately prevent proper wound healing, debridement and therapeutic cleansing is essential for its removal.^2,4 Furthermore, patients with chronic wounds often have recurring slough, which requires continuous debridement, through complimentary methods, to prevent reaccumulation and promote a healing trajectory. Integral debridement, a synergistic and individualized approach that uses multiple debridement techniques, such as an initial, more aggressive primary technique followed by an adjunctive and continuous debridement technique, is an advantageous method to prepare the wound bed and promote an optimal healing environment.² 

Selecting the primary and secondary debridement techniques depends on the individual patient’s wound etiology, patient comorbidities and tolerability, treatment goals, and clinician expertise and availability.^2,5 When clinically indicated, selective sharp debridement for chronic wounds is a favorable primary debridement technique to prepare the wound bed by careful removal of slough and other nonviable tissue while conserving healthy surrounding tissue. This primary debridement step is often the fastest and most effective initial intervention and is an excellent technique for the initial removal of slough.^2,5 

Continuous Wound Bed Preparation and the Role of Slough-Managing Dressings 

Following the initial primary debridement, secondary debridement methods are essential for chronic wounds to keep slough from re-accumulating and to continue on the healing trajectory. One of the most important shifts in modern wound care is the move away from episodic intervention toward continuous wound bed preparation.²  

Specialized wound dressings are commonly used to continuously maintain a clean wound bed following primary debridement. Some advanced dressings utilize multiple mechanisms of debridement, such as autolytic to maintain a moist wound environment to support endogenous enzymatic tissue breakdown, mechanical to physically loosen and remove nonviable tissue and biofilm, and/or charged fibers to promote active sequestration of slough and debris.^2,5  

For example, UrgoClean Ag dressings (Urgo Medical North America) utilize multiple mechanisms for debridement, combining electrostatic binding via charged fibers for active sequestration with moisture-mediated autolytic debridement and adjunctive mechanical trapping for continuous debridement of slough, devitalized tissue, and debris. In addition, the incorporation of silver also provides sustained antimicrobial activity to control bioburden and reduce the risk of infection. Thus, the combined actions of these dressings make them effective for promoting continuous wound healing and attractive for health care providers and caregivers given their accessibility and favorable tolerability by patients.^7-10 

Conclusion: A Proactive, Integrated Approach to Slough and Future Directions 

Ultimately, slough should be viewed as a dynamic and biologically active component of the wound environment. If not addressed adequately, slough can perpetuate inflammation, support microbial survival, and delay proper and timely wound healing. By integrating molecular biological insight with bedside clinical expertise, clinicians can make informed decisions that prioritize early recognition of slough, select appropriate and individualized integral debridement methods, and perform continuous wound bed preparation. Proactive patient management includes using dressings that support ongoing slough removal, which is central to maintaining a wound environment that ultimately promotes healing. More research is needed to further understand the potential prognostic ability of slough¹ as well as additional consensus guideline agreement on the continuous management of slough in the setting of chronic wounds.  

References  

1. Townsend EC, Cheong JZA, Radzietza M, et al. What is slough? Defining the proteomic and microbial composition of slough and its implications for wound healing. Wound Repair Regen. 2024;32(6):783-798. doi:10.1111/wrr.13170  
2. Mayer DO, Tettelbach WH, Ciprandi G, et al. Best practice for wound debridement. J Wound Care. 2024;33(Sup6b):S1-S32. doi:10.12968/jowc.2024.33.Sup6b.S1 
3. Sibbald RG, Elliott JA, Persaud-Jaimangal R, et al. Wound Bed Preparation 2021. Adv Skin Wound Care. 2021;34(4):183-195. doi:10.1097/01.ASW.0000733724.87630.d6 
4. Swanson T, Ousey K, Haesler E, et al. International Wound Infection Institute. Wound Infection in Clinical Practice: Principles of Best Practice, Third Edition (International Consensus Update 2022). Wounds International; 2022. https://woundinfection-institute.com/wp-content/uploads/IWII-CD-2022-web.pdf 
5. Lantis JC, et al. Toward a practical framework for debridement in chronic wounds: Findings from a US multidisciplinary consensus panel. Wounds. 2026;38(3 Suppl):S1-S20. doi:10.25270/wnds/25155 
6. Nair HKR, Balasubramaniam S, Frescos N, et al. Autolytic continuous debridement with a focus on biofilm management: Consensus document for the APAC region. London: Wounds International. 2024. https://woundsinternational.com/wp-content/uploads/2024/10/URG24_CD_APAC-debridement_WINT-WEB.pdf 
7. Tiwari A, Menon RR, Pillai AV, Dung NV, Thi Cam Van D. Clinical evaluation of UrgoClean Ag in patients with pressure injuries. Wounds International. 2024;15(2):1-11. 
8. Al Humaidi N, Badahdah H, Sarmiento KC, et al. UrgoClean Ag and UrgoStart Plus in real life. Wounds Middle East. 2024;Supplement:1-23. 
9. Dowsett C. A multidimensional approach to Wound Bed Preparation using UrgoClean Ag. Wounds UK. 2023;19(4):78-85. https://wounds-uk.com/wp-content/uploads/2023/11/WUK_2023_19_4_78_85_Dowsett.pdf 
10. Dissemond J, Dietlein M, Neßeler I, et al. Use of a TLC-Ag dressing on 2270 patients with wounds at risk or with signs of local infection: an observational study. J Wound Care. 2020;29(3):162-173. doi:10.12968/jowc.2020.29.3.162