Arterial Insufficiency

What arterial insufficiency is

Arteries carry oxygenated blood from the heart. When they narrow or block, the tissues downstream receive too little blood, a state called ischemia. At rest the muscles may get enough, but during walking their demand rises and they cramp. As the narrowing worsens, even the resting supply becomes inadequate.

The legs are most commonly affected, but arterial insufficiency also affects the arms (less often), intestines (mesenteric ischemia), kidneys and, in the case of the heart and brain, causes angina and strokes. This page focuses on the legs. For the disease itself, see peripheral artery disease.

Causes

• Atherosclerosis: by far the most common cause. Plaque builds up in artery walls over years.
• Arterial embolism or thrombosis: a clot, often from the heart in atrial fibrillation, suddenly blocks an artery. See peripheral arterial embolism.
• Diabetes: affects smaller arteries below the knee and also damages nerves, hiding warning pain.
• Buerger's disease: inflammation of small arteries in young heavy smokers.
• Vasculitis, radiation injury, artery trauma or entrapment (rare).

Risk factors

• smoking, the strongest single risk factor
• diabetes
• high blood pressure and high cholesterol
• age over 65, or over 50 with diabetes or smoking
• chronic kidney disease
• a personal or family history of heart disease or stroke

Symptoms and stages

Physical signs

• cool skin on the foot compared with the other leg
• weak or absent pulses in the foot
• shiny, thin, hairless skin on the shins and feet
• thick, slow-growing toenails
• pale feet when raised and dusky red when hanging down
• slow capillary refill (color returns slowly after pressing a toenail)

Arterial vs venous insufficiency

Both cause leg symptoms and ulcers, but they are opposite problems: arterial disease is too little blood getting in; venous disease is blood not draining out.

This is why ABI should be checked before compression is used for leg ulcers. Mixed disease is common in older adults.

Diagnosis

1. Ankle-brachial index (ABI): the ankle blood pressure divided by the arm pressure. Normal is 1.0 to 1.4. Below 0.9 indicates peripheral artery disease; below 0.4 suggests severe ischemia. In diabetes or kidney disease, stiff arteries can give falsely high readings, so a toe pressure is measured instead.
2. Exercise ABI if symptoms suggest claudication but the resting ABI is normal.
3. Duplex ultrasound to locate narrowings.
4. CT or MR angiography, or catheter angiography, when a procedure is planned.
5. Blood tests for diabetes, cholesterol and kidney function.

Treatment

Lifestyle

• Stop smoking: the most effective step for slowing disease and saving limbs.
• Supervised exercise therapy: walking until moderate pain, resting, then walking again, for 30 to 45 minutes at least 3 times a week for 12 weeks. It can roughly double pain-free walking distance.
• Foot care: inspect feet daily, wear well-fitting shoes, never walk barefoot, and see a podiatrist, especially with diabetes.

Medicines

• Statins to lower cholesterol and stabilize plaque, recommended for everyone with peripheral artery disease.
• Antiplatelet therapy (aspirin or clopidogrel), sometimes with low-dose rivaroxaban, to prevent heart attack, stroke and limb events.
• Blood pressure and diabetes control.
• Cilostazol can improve walking distance in claudication (not for people with heart failure).

Restoring blood flow

For lifestyle-limiting claudication despite exercise, or for rest pain and ulcers:

• Angioplasty and stenting through a catheter.
• Bypass surgery using a vein or synthetic graft.
• Clot removal or clot-dissolving drugs for sudden blockage.

Amputation is a last resort when the limb cannot be saved.

Complications and outlook

Arterial insufficiency in the legs signals that arteries elsewhere are also affected. People with peripheral artery disease have a higher risk of heart attack and stroke, so the medical treatment protects the heart and brain as well. With claudication alone, most limbs remain stable for years. Critical limb ischemia carries a significant risk of amputation without revascularization.

Frequently asked questions

What are the symptoms of arterial insufficiency?

The first symptom is usually cramping pain in the calf, thigh or buttock when walking that eases with rest. Advanced disease causes burning foot pain at rest, cold pale skin, hair loss on the legs, weak foot pulses and wounds that heal slowly or not at all.

What is the difference between arterial and venous insufficiency?

Arterial insufficiency means too little blood reaches the leg, causing pain on walking, cold pale skin and painful toe ulcers; it worsens when the leg is raised. Venous insufficiency means blood pools in the leg, causing swelling, heaviness, brown skin and ulcers near the ankle; it improves when raised.

How is arterial insufficiency diagnosed?

The main test is the ankle-brachial index, which compares blood pressure at the ankle and arm using a cuff and a handheld Doppler. A value below 0.9 indicates narrowed arteries. Ultrasound or angiography then shows where the blockages are.

Can arterial insufficiency be reversed?

The plaque itself is rarely reversed, but symptoms often improve substantially with stopping smoking, supervised walking and statins. Angioplasty, stenting or bypass surgery can restore blood flow when needed. Treatment also lowers the risk of heart attack and stroke.

Is walking good for arterial insufficiency?

Yes. Regular walking, especially in a supervised program, encourages new small blood vessels and better muscle efficiency. Walk until moderate pain, rest until it passes, and repeat for 30 to 45 minutes, at least 3 times a week.