Vascular Ulcers
Vascular ulcers are chronic wounds that result from problems in the blood vessels, either veins or arteries, in the lower limbs. When circulation is impaired, the skin and tissues do not receive sufficient oxygen or nutrients, which makes it difficult for wounds to heal and easier for ulcers to form. These ulcers typically appear on the legs and feet and are commonly classified as venous, arterial, or mixed arterial-venous ulcers, depending on the underlying cause.
Venous Leg Ulcers (VLUs)
What are Venous Leg Ulcers?
Venous leg ulcers are the most common type of vascular ulcers and are caused by chronic venous insufficiency. They typically develop around the medial malleolus (inner ankle) due to long-term pressure and pooling of blood in the lower leg veins.
How Does the Wound Happen?
In chronic venous insufficiency, the valves in the leg veins fail to function properly, causing blood to flow backward and pool in the lower legs. This leads to increased pressure inside the veins (venous hypertension), which gradually weakens the skin. The constant buildup of fluid and poor circulation make the skin vulnerable to breakdown from even minor trauma or scratching, leading to the formation of a venous ulcer.
What Happens If Not Treated?
- Persistent wound and delayed healing: Without medical intervention, the ulcer may persist for months or even years, remaining open and vulnerable to infection.
- Chronic inflammation and skin changes: Ongoing venous pressure can cause thickening and darkening of the skin around the wound (lipodermatosclerosis), making future healing more difficult.
- Increased risk of infection: The open wound can become infected, potentially spreading to the surrounding tissue (cellulitis) or deeper layers, including muscle and bone.
- Pain and mobility problems: The ulcer may become increasingly painful, especially when standing or walking, leading to reduced mobility and quality of life.
- Recurrent ulcers: Even if healed, untreated venous insufficiency can lead to frequent ulcer recurrence, resulting in a cycle of chronic wound care.
Arterial Ulcers (Ischemic Ulcers)
What are Arterial Ulcers?
Arterial ulcers, also called ischemic ulcers, are caused by peripheral arterial disease (PAD)—a condition where narrowed or blocked arteries reduce blood flow to the legs and feet. These ulcers are often located on the toes, heels, or pressure points on the feet and are usually very painful.
How Does the Wound Happen?
In peripheral arterial disease, fatty deposits (atherosclerosis) build up inside the arteries, restricting blood flow. The reduced circulation means that even small injuries cannot heal properly. In areas under pressure, like the tips of toes or heels, the skin begins to break down due to the lack of oxygen, leading to ulcer formation. Because of the poor blood supply, the wound heals slowly or not at all without medical intervention.
What Happens If Not Treated?
- Progressive tissue death: Without enough blood flow, tissues around the ulcer may die, turning black and dry—a condition known as necrosis or dry gangrene.
- Severe pain and discomfort: Arterial ulcers are often painful, especially at night or when the leg is elevated, making sleep and daily life difficult.
- Risk of critical limb ischemia: Prolonged lack of blood flow can lead to critical limb ischemia, a serious condition that may require emergency intervention to prevent limb loss.
- Amputation may be necessary: If revascularization is not possible and the ulcer becomes infected or gangrenous, surgical removal of the affected limb may be required.
- High risk of infection: Infected ischemic ulcers can spread quickly to surrounding tissues and the bloodstream, increasing the risk of sepsis and life-threatening complications.
Mixed Arterial-Venous Ulcers
What are Mixed Arterial-Venous Ulcers?
Mixed ulcers are wounds caused by a combination of venous insufficiency and arterial disease. These ulcers typically form in the lower leg and share characteristics of both venous and arterial ulcers, making them more complex to treat.
How Does the Wound Happen?
In mixed ulcers, both the veins and arteries are compromised. Blood pools in the lower legs due to weak veins, while narrowed arteries restrict fresh blood supply. This combination creates a critical imbalance in circulation, resulting in skin that is both congested and deprived of oxygen. The tissue becomes highly vulnerable, and even minor injuries can evolve into difficult-to-heal ulcers.
What Happens If Not Treated?
- Delayed or absent healing: Because both blood inflow and outflow are impaired, healing is extremely slow or may not occur without targeted vascular treatment.
- Frequent infections: The compromised skin barrier and stagnant blood flow increase the risk of bacterial growth and recurring infections.
- Severe pain and tissue damage: These ulcers often cause persistent pain, and the lack of oxygenated blood may lead to tissue death, especially in more arterial-dominant cases.
- High risk of complications: Without proper assessment and a coordinated treatment plan, the ulcer may rapidly deteriorate, increasing the likelihood of hospitalization, surgical debridement, or amputation.
- Complex treatment and recurrence: These wounds require careful management of both venous and arterial issues. If not treated thoroughly, mixed ulcers often recur and become chronic.
