Peripheral Artery Disease and Edema

Introduction to PAD

• The American College of Cardiology states that peripheral artery disease (PAD) is fundamentally a disease of arterial insufficiency caused by atherosclerotic occlusion of lower extremity arteries, resulting in reduced blood flow to the limbs 1, 2, 3
• The American Heart Association recommends considering alternative diagnoses such as venous disease, heart failure, or other systemic causes when edema is present in patients with suspected PAD 4

Clinical Presentations of PAD

• The American College of Cardiology recommends recognizing the typical manifestations of PAD, which include intermittent claudication, ischemic rest pain, non-healing wounds or ulcerations, and gangrene in severe cases 5
• The American College of Cardiology suggests that physical examination findings in PAD should include signs of arterial insufficiency, such as diminished or absent pulses, cool skin temperature, trophic changes, pallor on elevation, and absence of edema 5

Differential Diagnoses for Edema

• The American College of Cardiology states that the presence of peripheral edema in a patient with suspected PAD should trigger evaluation for other conditions, including venous disease, lymphedema, and systemic conditions such as heart failure and renal disease 4, 3, 6
• The American Heart Association recommends considering localized infection or inflammation, May-Thurner syndrome, and other venous obstruction as potential causes of asymmetric edema 4, 5

Special Considerations

• The American Diabetes Association notes that in patients with diabetes and foot ulcers, PAD is present in approximately 50% of cases, but edema in this population suggests coexisting infection, venous insufficiency, or neuropathic changes affecting venous return 6, 4
• The American College of Cardiology recommends a practical clinical approach to evaluating lower extremity edema, including determining if edema is unilateral or bilateral, prioritizing systemic causes if bilateral, and considering venous disease or localized pathology if unilateral 4

Diagnostic Approach

• The American College of Cardiology suggests performing a comprehensive vascular examination, including pulse palpation and assessment for arterial insufficiency signs, to evaluate patients with suspected PAD and edema 4, 3
• The American Heart Association recommends treating arterial disease and edema as separate conditions if both coexist 6

Terminology and Clinical Scope of Peripheral Artery Disease (PAD)

Preferred Terminology

• The American College of Cardiology/American Heart Association (ACC/AHA) guidelines state that “peripheral arterial disease” is the preferred clinical term for atherosclerotic stenotic, occlusive, and aneurysmal disease of the aorta and its branch arteries, excluding the coronary arteries【7】【8】【9】【10】.

• Peripheral Vascular Disease (PVD) is considered outdated because it is imprecise and may be confused with venous or other vascular pathologies【11】.

Anatomical Scope

• PAD encompasses atherosclerotic disease of all infradiaphragmatic arteries—including the abdominal aorta, renal arteries, mesenteric arteries, and lower‑extremity arteries—representing the full spectrum of arterial insufficiency below the diaphragm【7】【8】【9】.

• Specific conditions classified under PAD are:

  • Lower‑extremity arterial disease (the most common presentation)【11】【7】【9】
  • Abdominal aortic aneurysms【10】
  • Renal artery stenosis【11】
  • Mesenteric arterial disease【7】

• The guidelines deliberately exclude carotid, vertebral, thoracic aortic, and upper‑extremity arterial diseases from the PAD definition to keep the focus on infradiaphragmatic arterial pathology【7】【8】【9】【10】.

Epidemiology

• PAD affects approximately 8–12 million adults in the United States; prevalence rises to ≈29 % among individuals aged ≥ 70 years or those aged 50–69 years with diabetes or a significant smoking history【11】.

• Up to 50 % of individuals with PAD are asymptomatic, underscoring the importance of targeted screening in at‑risk populations【11】.

Clinical Implications

• Patients with PAD have a markedly increased risk of myocardial infarction, stroke, and cardiovascular death, reflecting the systemic nature of atherosclerosis; therefore, cardiovascular risk reduction is the primary therapeutic priority【7】【8】.