Peripheral Artery Disease

What Is Peripheral Artery Disease?

Peripheral artery disease (PAD) is a progressive circulatory disorder in which the arteries that carry oxygen-rich blood from the heart to the extremities become narrowed or obstructed. It most commonly affects the lower extremities, including the thighs, calves, ankles, and feet. Because healthy circulation is the primary vehicle delivering oxygen, white blood cells, and healing nutrients to bodily tissues, compromised blood flow has a direct, negative impact on skin integrity and repair.

Signs and Symptoms of PAD

Many individuals in the early stages of PAD experience mild or non-specific symptoms that are often mistaken for normal aging or arthritis. As arterial narrowing worsens, symptoms become more pronounced, including:

• Intermittent claudication: Muscle cramping, heaviness, or aching in the calves, thighs, or buttocks that occurs during physical activity and subsides with rest.
• Rest pain: A burning or aching pain in the feet or toes that often occurs at night when lying flat and may improve when hanging the legs over the edge of the bed.
• Temperature differences: One foot or lower leg feeling noticeably cooler to the touch than the other.
• Trophic skin changes: Pale, bluish, or shiny skin on the lower legs, reduced hair growth, and brittle or slow-growing toenails.
• Weakened pulses: Faint or undetectable pulses in the feet or ankles.
• Slow-healing wounds: Scrapes, blisters, or sores on the toes or feet that fail to heal or slowly deteriorate into an arterial ulcer.

Causes and Risk Factors

The primary cause of peripheral artery disease is atherosclerosis, a systemic process where fatty deposits, cholesterol, and calcium build up along arterial walls to form plaques. Over time, these plaques stiffen and narrow the vessel lumen. Major risk factors for developing PAD include tobacco use, chronic kidney disease, advancing age, high blood pressure, and elevated cholesterol levels. Individuals with diabetes are especially susceptible, as vascular impairment often pairs with loss of protective sensation, compounding the severity of diabetic foot ulcers.

How PAD Affects Wound Healing

Every phase of tissue repair depends on robust microvascular perfusion. When arterial blood flow drops below the threshold required to sustain cellular metabolism, tissues experience ischemia and tissue hypoxia. Without adequate oxygen, white blood cells cannot effectively fight off invading bacteria, and fibroblasts cannot synthesize the structural proteins necessary for closing a wound. Even minor pressure or trauma from ill-fitting shoes can quickly progress to an open, non-healing ulcer that carries a significant risk of severe infection and tissue death.

Evaluation and Diagnosis

Diagnosing PAD involves a thorough clinical examination alongside objective vascular testing. A clinician evaluates skin temperature, capillary refill time, and pedal pulses. Key diagnostic tools include:

• Ankle-Brachial Index (ABI): A noninvasive test comparing the systolic blood pressure in the ankle to that in the arm using a blood pressure cuff and a handheld Doppler probe.
• Pulse Volume Recording (PVR) and Doppler Ultrasound: Noninvasive assessments that map the waveform of blood pulsing through the lower limb vessels.
• Advanced Imaging: Angiography (computed tomography, magnetic resonance, or catheter-based) may be performed if surgical or endovascular revascularization is being considered.

Wound Care and Treatment Approaches

Managing wounds complicated by PAD requires a multidisciplinary strategy focused on restoring perfusion, protecting vulnerable skin, and prioritizing limb preservation. Because ischemic tissues are fragile, aggressive intervention such as standard debridement on unvascularized dry eschar is generally avoided until arterial blood supply is evaluated by a vascular specialist.

Depending on the clinical assessment, advanced wound care therapies may be integrated into the treatment plan. Modalities such as hyperbaric oxygen therapy may be utilized for qualifying non-healing hypoxic wounds to dissolve higher concentrations of oxygen directly into the plasma. In homebound or mobility-impaired patients, specialized bedside wound care delivers targeted dressings, non-weight-bearing protective measures, and frequent monitoring directly to the patient.

When to Seek Professional Medical Care

If you or a loved one notice a sore, cut, or discoloration on the foot or ankle that has not shown clear signs of healing after one to two weeks, contact a healthcare professional promptly. Immediate medical attention is warranted if you experience severe pain in the foot at rest, notice sudden skin color changes (such as black, dark purple, or pale blue areas), or observe signs of infection such as spreading redness, swelling, warmth, or drainage.