A chronic wound is one that has failed to progress through the phases of healing in an orderly and timely fashion and has shown no significant progress toward healing in 30 days. Factors contributing to the chronicity of the wound may include:
- Pressure, trauma and/or lower extremity wounds
- Increased bacterial load
- Excessive proteases: Degraded growth factors, matrix metalloproteinases (MMPs), degraded cell surface structures
- Senescent/Aberrant cells
- Inappropriate treatment
Symptoms of Chronic Wounds
Chronic wounds are typically identified by a raised, hyperproliferative, yet non-advancing wound margin. The area around the wound will be inflamed and this inflammation may be affect healing negatively.
Venous ulcers occur primarily in the legs of patients and are caused by problems with blood circulation due to dysfunctional blood valves or obstructed veins.
Diabetic ulcers often start as small scratches or bruises which patients with diabetes fail to notice due to nerve damage and limited sensitivity. Compromised immune systems and damaged capillaries lead to these formerly small and benign wounds becoming dangerously infected.
Pressure ulcers primarily afflict patients who are bedridden or of limited mobility. The constant pressure on the tissue over powers the pressure of the capillaries, affecting blood flow. Areas at the greatest risk for pressure ulcers are the sacrum, shoulder blades and heels. Correctly identifying the cause of a chronic wound as well as the local and systemic factors that may be contributing to poor wound healing is critical to successful wound treatment.
There are several factors that can increase a patient's risk of developing a chronic wound. Bariatric patients and those with diabetes or venous insufficiency are at elevated risk as well as older patients.
Treatments & Interventions for Chronic Wounds
The treatment of chronic wounds, once again, varies based on the type of wound. Often, underlying causes must be addressed first before wound healing can progress. Individuals with diabetes will need to improve their nutrition and vascular health and both diabetic and pressure ulcers will require offloading for the affected area. Arterial ulcers will require revascularization while venous ulcers will benefit from compression therapy. The Wound Healing Society advocates use of the acronym TIME to remember factors that contribute to poor wound healing:
- T: Tissue, such as the presences of necrotic tissue in a wound
- I: Inflammation or infection.
- M: Moisture, i.e. whether the wound is macerated or dessicated.
- E: (Wound) Edge - whether re-epithelializing or non-advancing.
American Society of Plastic Surgeons. Evidence-based Clinical Practice Guideline: Chronic Wounds of the Lower Extremity. http://www.plasticsurgery.org/Documents/medical-professionals/health-pol.... Accessed on August 11, 2013.
Krasner D. Chronic Wound Care 5. HMP Communications; 2012.
The Angiogenesis Foundation. Types of Chronic Wounds. Science of Wound Healing. 2012. Accessed on August 11, 2013.
The Wound Healing Society. Chronic Wound Care Guidelines. http://www.woundheal.org/assets/documents/final%20pocket%20guide%20treat... . Accessed on August 11, 2013.
Werdin F, Tennenhaus M, Rennekampff HO. Evidence-based Management Strategies for Treatment of Chronic Wounds. Eplasty. 2009; 9: e19.