Peripheral Vascular Disease

Core Concepts

PAD: arteries narrowed by atherosclerosis

Peripheral arterial disease is the same process as coronary artery disease, moved to the limbs: fatty plaques narrow the arteries, most often in the aorto-iliac, femoral, and popliteal segments, reducing blood flow. The classic symptom is intermittent claudication — a cramping, aching, or burning pain in the calf (or thigh/buttock, depending on the level of the blockage) that comes on predictably with walking a certain distance and is relieved within a few minutes of rest. The pain is a demand problem: muscles need more oxygen during exercise, and the narrowed artery cannot deliver it. As disease worsens, pain comes on with less and less activity until it appears at rest, classically at night in the foot, relieved by hanging the leg over the bed (gravity helps). Rest pain signals critical ischemia — tissue is in danger.

The physical examination story

The nurse's findings tell the story. In arterial disease the affected leg is cool, pale (especially when elevated — "elevation pallor"), and the pulses are weak or absent; the foot may be shiny, hairless, with thickened nails; with chronic severe disease the leg may look dusky red when dependent ("dependent rubor") because maximally dilated capillaries fill with sluggish blood. In venous disease, by contrast, the leg is warm, swollen, with brown hemosiderin staining and varicosities, and pulses are usually normal. This is the classic comparison table of vascular nursing, and it is worth memorizing cold.

The six Ps of acute arterial occlusion

When an artery to a limb is suddenly blocked — by an embolus from the heart or a proximal aneurysm, or by in-situ thrombosis — the limb is in acute danger and the clock runs in hours, not days. The mnemonic is the six Ps: pain (sudden, severe), pallor (pale, then mottled), pulselessness (absent pulse beyond the block), paresthesia (numbness/tingling), paralysis (loss of movement — a late and ominous sign), and poikilothermia (the limb takes on room temperature). This is a surgical emergency: the nurse's role is immediate recognition, marking the level where pulses are lost, keeping the limb in a neutral/dependent position per protocol, and urgent escalation. Paralysis and sensory loss mean muscle is dying; delay costs the limb.

Arterial versus venous ulcers

Ulcers put the whole picture together. Arterial ulcers sit on pressure points — toes, heels, lateral foot — are deep, punched-out, dry, and exquisitely painful (worse at night, worse with elevation), with a pale or necrotic base and little exudate. Venous ulcers sit above the medial ankle, are shallow, irregular, moist, and weepy, surrounded by brown staining and edema, and are less painful. The treatment directions are opposite: arterial ulcers need improved blood flow (revascularization decisions, walking programs, protecting the limb from injury), while venous ulcers need elevation, compression, and mobility. Scope note: ulcer care, dressings, and wound products are chosen by the care team per institutional protocol — the nurse's contribution is accurate assessment, documentation, infection vigilance, and teaching.

Nursing care: protect the feet, keep the blood moving

For the person with PAD, nursing care is largely prevention teaching. Feet must be inspected daily (a mirror or family member helps), washed gently, dried carefully, and moisturized — but never between the toes. Shoes must fit; walking barefoot is discouraged; toenails should be cut by someone who can see well (straight across, not into the corners); heating pads and hot water bottles are avoided because the insensitive, ischemic foot can burn without the person noticing. A supervised walking program is a mainstay — walking to near-pain, resting, and repeating builds collateral circulation. Smoking cessation is the single most powerful intervention and deserves nonjudgmental, repeated support. Positioning is disease-specific: arterial legs are rested in a dependent position (gravity assists flow; elevation worsens pain), while venous legs are elevated. Knowing which disease is which is a patient-safety issue.

Raynaud's phenomenon and Buerger's disease

Two less common but classic disorders round out the topic. Raynaud's phenomenon is episodic spasm of small arteries in the fingers (and toes), triggered by cold or stress, causing color changes — white, then blue, then red as flow returns — with numbness and tingling. It is usually primary (benign, common in young women) but can be secondary to conditions like scleroderma, in which case it is more severe. Teaching: keep the whole body warm, avoid triggers, protect hands. Buerger's disease (thromboangiitis obliterans) is a rare inflammatory disease of small and medium vessels, almost exclusively in people who smoke, causing pain, ischemia, and ulcers of fingers and toes that can progress to amputation; the essential intervention is complete smoking cessation.

Common Confusions