There are two important (and sometimes indistinguishable) causes of venous stasis ulcers. One half to two-thirds of venous stasis ulcers result from progressive disease of the leg veins. The course of such disease is predictable: it starts with the development of varicose veins caused by refluxing of blood within the veins due to incompetent valvular structures. These varicosities may cause variable swelling and discomfort. As disease progresses, skin changes occur (hemosideran staining and dermal and subcutaneous thickening and scarring) which eventually lead to the formation of a venous stasis ulcer. The course of the disease often culminates in ulcer formation in patients in their 60s and 70s.
Approximately one-third to one-half of venous stasis ulcers occur after the patient experiences DVT (deep vein thrombosis). DVTs may cause the process of ulcer formation to occur more quickly than in primary venous insufficiency as described above. Patients who have had a DVT may also present with hemosiderin staining, swelling and discomfort, making it difficult to distinguish post-phlebotic ulcer formation from ulcer formation stemming from venous insufficiency.
How are Venous Stasis Ulcers Treated?
Compression therapy is standard in healing venous stasis ulcers; however, before compression therapy is begun, arterial and venous circulation should be evaluated thoroughly to ensure that compression therapy is safe. This can be done by measuring ABIs (ankle brachial pressure index) or by Doppler studies of the lower extremities. Ace wraps are one simple method of compression that can be used, and offers the advantage of ease of application for some patients. Unna boots, which provide compression and wound care together, may also be used. In addition, patients may be measured and fitted for elastic compression stockings. These are commonly used, but may be difficult for some patients to don and doff.
The following wound preparations may be recommended:
- Topical or systemic antibiotic therapy for wounds that are infected
- Debridement of exudates and fibrous tissue to stimulate the growth of new epithelium
- Absorbent dressings for heavily draining ulcers
- Acetic acid
- Silver nitrate dressings
- Calcium alginate dressings
- Proteolytic enzyme agents
- Synthetic occlusive dressings
Moist wound healing is the key to healing venous stasis ulcers, facilitating epidermis formation over moist granulation tissue.