Peripheral Arterial Disorders, Arterial Ulcers, Aneurysms & Buerger’s Disease

Focus of lecture: arterial blood flow to / from extremities (not venous return).
Aging of arterial walls → loss of elasticity, plaque build-up, and lumen narrowing/occlusion.

Arteriosclerosis / Atherosclerosis → gradual plaque formation → lumen blockage.
Thrombosis/Emboli can lodge at narrowed sites → complete obstruction.
Once artery is fully blocked → downstream tissues become ischemic → necrosis → dry arterial ulcer develops.
Distinction vs. venous ulcers:
• Arterial ulcer = dry, little/no fluid, has foul “dead-animal” odor, minimal edema.
• Venous ulcer = moist, exudative, classically surrounded by edema.

Intermittent claudication (first cardinal symptom):
• Pain appears with activity/exercise because working muscle demands ↑O₂.
• Occluded artery can’t dilate → inadequate flow → ischemic pain.
• Rest relieves pain as metabolic demand drops.
Progressive disease → nighttime / resting burning pains.
• Occurs when legs are horizontal → reduced gravitational assistance.
• Dangling extremity off bed (dependent position) uses gravity to augment flow → pain subsides.
Additional findings:
• Cool, pale skin; possible hair loss; diminished/absent pulses distal to occlusion.
• No significant edema unless combined venous disease.

Etiology: chronic high-pressure “splashing” of blood weakens arterial wall → out-pouching.
Shapes/types mentioned:
• Fusiform (circumferential dilation).
• Dissecting (blood splits arterial layers).
• Implied others (saccular, etc.).
Possible locations: brain ("brain aneurysm"), leg, any large artery.
Usually painless; may cause vague adjacent pain.
Major risk = rupture → massive hemorrhage → hypovolemic shock (analogy: burst main water pipe causing flooding).
Once ruptured, external pressure rarely controls bleeding; emergent surgery required.

Imaging (arteriogram, CT/MRI) reveals aneurysm size & shape.
Teach patient to report any sudden change (new pain, pulsating mass, neuro deficits, etc.) → possible expansion/impending rupture.

Risk-factor modification / disease-progression prevention
• Strict smoking cessation (critical in Buerger’s/Vogans).
• Control hypertension, hyperlipidemia, diabetes.
• Avoid cold exposure (cold → vasoconstriction → worsened occlusion).
Pharmacologic therapy
• No single “aneurysm drug.”
• Tailor to symptoms: anti-hypertensives for ↑BP, antiplatelets or anticoagulants for thrombosis risk, analgesics for pain.
Surgical interventions
• Bypass grafting: harvest vein or use synthetic graft to detour around obstruction (illustrated as graft placed distal to blockage).
• Endovascular repair or open surgery for large/rapidly growing aneurysms.
Lifestyle / Positioning
• Encourage rest with legs dependent when pain occurs.
• Avoid tight clothing, avoid lower-leg elevation above heart in severe ischemia.

Non-atherosclerotic inflammatory occlusive disorder.
Commonly affects lower extremities (ankle → toes) and upper extremities (wrist → fingers).
Strong correlation with heavy cigarette/tobacco use.
Ultimate risk: chronic ischemia and possible amputation of distal digits.

Pain pattern (activity vs. rest) differentiates arterial from venous problems.
Dry, foul-smelling ulcer + minimal edema = arterial origin.
Cold exposure & smoking both exacerbate arterial occlusions.
Aneurysm rupture = surgical emergency; teach patients to seek immediate care for new symptoms.
Long-term goal: halt progression by removing modifiable risks and, when necessary, using bypass or endovascular techniques.