Porter Health
Understanding Peripheral Artery Disease (PAD)
A Patient's Guide to Blocked Leg Arteries: Diagnosis, Treatment, and Prevention
Peripheral Artery Disease (PAD) occurs when the arteries in your legs become narrowed or blocked by plaque (fat, cholesterol, calcium). This reduces blood flow to your leg muscles, causing pain when walking and, in severe cases, leading to tissue damage or amputation.
Think of PAD Like Clogged Pipes:
Normal Arteries:
Blood flows freely to your legs and feet, delivering oxygen and nutrients
PAD Arteries:
Plaque buildup blocks flow, starving muscles of oxygen during activity
PAD Is a Warning Sign: If you have PAD, you likely have plaque buildup in other arteries too (heart, brain, kidneys). People with PAD have 3-4 times higher risk of heart attack and stroke.
PAD Affects 8-12 Million Americans
- More than 200 million people worldwide
- Risk increases with age (affects 20% of people over 70)
- More common in smokers, diabetics, and those with high blood pressure
- Leading cause of amputation in the U.S.
- Often underdiagnosed - many dismiss symptoms as "just aging"
Important: Nearly 40% of people with PAD have NO symptoms!
Just because you don't feel pain doesn't mean you don't have PAD. This is why screening is important if you have risk factors.
Classic Symptom: Claudication (Leg Pain with Walking)
Intermittent Claudication
What it feels like: Cramping, aching, tiredness, or pain in your leg muscles (calf, thigh, buttock) that:
- Starts when you walk or climb stairs
- Gets worse the farther you walk
- Goes away within 10 minutes of rest
- Comes back predictably with the same distance/activity
- Most common in calf muscles
Example: "I can walk 2 blocks before my calf starts cramping. I stop and rest for 5 minutes, and the pain goes away. Then I can walk another 2 blocks before it comes back."
Other PAD Symptoms
Critical Limb Ischemia - Medical Emergency!
Call 911 or go to ER immediately if you have:
- Rest pain: Severe pain in feet or toes even at rest, worse when lying down
- Non-healing wounds: Ulcers, sores, or gangrene (black tissue) on feet or legs
- Cold, numb, painful leg: Sudden onset (may be blood clot)
These are signs of severely reduced blood flow - risk of amputation is high without immediate treatment!
The primary screening test for PAD is simple, painless, and takes about 10 minutes:
Ankle-Brachial Index (ABI) Test:
- Measure blood pressure in your arms (brachial)
- Measure blood pressure in your ankles
- Divide ankle pressure by arm pressure = ABI
Understanding Your ABI Results:
ABI 1.0-1.4: Normal
Blood flow to legs is normal
ABI 0.91-0.99: Borderline
May have early PAD, lifestyle changes recommended
ABI 0.41-0.90: PAD Present
Mild to moderate PAD, treatment needed
ABI ≤0.40: Severe PAD
Critical limb ischemia, urgent intervention may be needed
ABI >1.4: Non-compressible arteries
Stiff arteries (common in diabetes), need other tests
Other Tests for PAD:
- Doppler ultrasound: Shows blood flow in arteries
- CT angiography or MR angiography: Detailed images of arteries
- Angiography: X-ray with dye injection (most detailed, invasive)
Walking is the #1 treatment for PAD claudication!
Supervised exercise therapy (walking programs) work better than most medications. Studies show you can increase your walking distance by 150-200% with a structured program.
How Walking Helps:
- Stimulates growth of new small blood vessels (collaterals) around blockages
- Improves oxygen delivery and usage by muscles
- Reduces inflammation
- Improves walking distance and quality of life
Supervised Exercise Prescription:
- Frequency: 3-5 times per week (ideally supervised)
- Duration: 30-45 minutes per session
- Intensity: Walk until you feel moderate claudication pain
- Rest: Stop and rest until pain subsides, then resume
- Repeat: Cycle of walk-rest-walk throughout the session
- Program length: At least 12 weeks for best results
Ask Your Doctor About:
- Supervised exercise therapy programs in your area
- Cardiac rehabilitation (many programs now include PAD patients)
- Home-based walking programs if supervised not available
Medications for PAD focus on preventing heart attack and stroke (which are the biggest risks) and improving walking distance:
Critical Medications (Prevent Heart Attack & Stroke):
1. Antiplatelet Therapy (Blood Thinners)
Goal: Prevent blood clots that cause heart attacks and strokes
First-line: Aspirin 81-325 mg daily OR Clopidogrel (Plavix) 75 mg daily
High-risk PAD: Dual therapy (aspirin + rivaroxaban 2.5mg twice daily) - reduces heart attack/stroke by 25% but higher bleeding risk
2. High-Intensity Statin
Goal: Lower LDL cholesterol to <70 mg/dL, stabilize plaque, reduce heart attack/stroke
Examples: Atorvastatin 40-80 mg, rosuvastatin 20-40 mg
3. Blood Pressure Control
Goal: Target <130/80 mmHg
Preferred: ACE inhibitors or ARBs (also protect kidneys and heart)
Medications to Improve Walking Distance:
Cilostazol (Pletal)
What it does: Improves blood flow and walking distance by 40-60%
Dose: 100 mg twice daily (take on empty stomach)
Side effects: Headache, diarrhea, palpitations
⚠️ Contraindicated if you have heart failure
For severe PAD or critical limb ischemia, procedures can open blocked arteries:
Angioplasty and Stenting
How it works: Thread a catheter through arteries to the blockage, inflate a balloon to open it, place a stent (metal mesh tube) to keep it open
Benefits: Minimally invasive, no surgery, quick recovery
Who: Single or short blockages, critical limb ischemia
Bypass Surgery
How it works: Create a detour around blocked artery using a vein from your leg or a synthetic tube
Benefits: Longer-lasting than angioplasty
Who: Long or multiple blockages, failed angioplasty, critical limb ischemia
Atherectomy
How it works: Remove plaque from artery using a special catheter with a cutting or shaving device
Who: Heavy calcium buildup, severely narrowed arteries
When Are Procedures Needed?
- Critical limb ischemia: Rest pain, non-healing wounds, gangrene (to save leg from amputation)
- Severe claudication: Disabling symptoms despite exercise and medications
- Lifestyle limitation: Can't work or do normal daily activities
Poor blood flow = slow healing. Even small cuts can become serious.
Daily foot care is essential to prevent infections and ulcers that can lead to amputation.
Daily Foot Care Checklist:
Inspect feet daily
Check for cuts, blisters, redness, swelling, or color changes. Use a mirror for bottom of feet.
Wash feet daily
Use warm (not hot) water and mild soap. Dry thoroughly, especially between toes.
Moisturize
Apply lotion to prevent dry, cracked skin. Don't put lotion between toes.
Trim toenails carefully
Cut straight across, not too short. See a podiatrist if you have thick nails or poor vision.
Wear proper shoes
Well-fitting, supportive shoes. Never go barefoot, even indoors.
Check shoes before wearing
Feel inside for pebbles, rough spots, or foreign objects.
Protect feet from temperature
Avoid heating pads, hot water bottles. Test bath water with elbow.
Don't self-treat corns/calluses
See a podiatrist - never use sharp tools or chemical removers.
⚠️ Call Your Doctor Immediately If You Notice:
- Any cut, blister, sore, or wound on your foot (even small ones)
- Redness, warmth, swelling, or drainage
- Color change (blue, black, or very pale)
- Ingrown toenail or infected toenail
Use this checklist to guide your conversation about peripheral artery disease:
PAD = blocked leg arteries, but also means 3-4x higher risk of heart attack/stroke
Classic symptom: leg pain/cramping when walking that goes away with rest (claudication)
Nearly 40% have NO symptoms - screening (ABI test) important if you have risk factors
Supervised exercise therapy (walking programs) is the #1 treatment - improves distance by 150-200%
Critical medications: antiplatelet (aspirin or Plavix), high-intensity statin (LDL <70), BP control
Cilostazol can improve walking distance but contraindicated if you have heart failure
Procedures (angioplasty, bypass) reserved for severe PAD or critical limb ischemia
Daily foot care essential - even small cuts can lead to serious infections/amputation
References:
Based on the 2024 ACC/AHA Guideline for the Management of Lower Extremity Peripheral Artery Disease. This guide translates clinical guidelines into patient-friendly language to help you understand and manage PAD.
Gornik HL, Aronow HD, Goodney PP, et al. 2024 ACC/AHA/AACVPR/APMA/ABC/SCAI/SVM/SVN/SVS/SIR/VESS Guideline for the Management of Lower Extremity Peripheral Artery Disease. Circulation. 2024. doi:10.1161/CIR.0000000000001251