Leriche syndrome
Summary
Leriche syndrome is chronic aortoiliac occlusive disease (atherosclerotic occlusion of the distal abdominal aorta/common iliac arteries). Classic triad: bilateral buttock/thigh claudication, diminished or absent femoral pulses, and erectile dysfunction in men.
Detail
DEFINITION: Atherosclerotic occlusive disease at the aortic bifurcation (infrarenal aorta and common iliac arteries), described by René Leriche in 1923. Also called aortoiliac occlusive disease.
PATHOPHYSIOLOGY: Atherosclerosis causes progressive stenosis and eventual thrombotic occlusion at the aortic bifurcation. Risk factors: smoking (strongest; classically a younger male smoker, 40s-50s), hyperlipidemia, diabetes, hypertension, and a small-vessel/hypoplastic aorta (more common in women). Gradual occlusion lets collateral vessels develop. These include the internal thoracic -> superior epigastric -> inferior epigastric -> external iliac pathway, the inferior mesenteric -> superior rectal -> internal iliac pathway (via the marginal artery of Drummond/meandering mesenteric artery), and lumbar -> iliolumbar/circumflex iliac pathways. This is why limb ischemia is often chronic rather than acute.
CLASSIC TRIAD: 1. Claudication of the buttocks, thighs, and calves (proximal disease causes proximal muscle symptoms), usually bilateral. 2. Absent or diminished femoral pulses (bilateral). 3. Erectile dysfunction (impaired internal iliac/pudendal flow). Other findings: muscle atrophy, pallor or cool legs, hair loss, poorly healing wounds, and femoral bruits. Severe disease can cause rest pain or tissue loss (critical limb ischemia).
DIAGNOSIS: Ankle-brachial index (ABI) <0.9 (abnormal, though often falsely elevated in diabetics because of calcified noncompressible vessels). Next steps are segmental pressures and pulse-volume recordings, duplex ultrasound, and CT angiography or MR angiography. Conventional angiography is gold standard but is now used mainly when intervention is planned.
MANAGEMENT: - Risk factor modification: smoking cessation, statin, antiplatelet (aspirin or clopidogrel), BP and glucose control. - Supervised exercise therapy; cilostazol for claudication (contraindicated in heart failure). - Revascularization for lifestyle-limiting claudication or critical limb ischemia: endovascular (angioplasty/stenting) for focal lesions, or surgical aortobifemoral bypass for extensive disease (best long-term patency).
DIFFERENTIALS / HIGH-YIELD COMPARISONS: - Lumbar spinal stenosis (neurogenic claudication): pain relieved by sitting or lumbar flexion, normal pulses. - Acute aortic occlusion (saddle embolus): sudden onset, 6 Ps (pain, pallor, pulselessness, paresthesia, paralysis, poikilothermia). - Takayasu arteritis: young Asian women, absent pulses ("pulseless disease"). - Femoropopliteal disease: calf claudication with a normal femoral pulse and absent popliteal/distal pulses. - Aortic dissection or aneurysm can also involve the iliacs but present differently.
COMPLICATIONS: Critical limb ischemia, gangrene, blue toe syndrome (distal atheroembolization), and need for amputation.
Sources
- First Aid for the USMLE Step 1 (Cardiovascular: atherosclerosis and peripheral artery disease)
- Robbins & Cotran Pathologic Basis of Disease (Atherosclerosis)
- Sabiston Textbook of Surgery (Aortoiliac occlusive disease)
- 2024 ACC/AHA Guideline for Management of Lower Extremity Peripheral Artery Disease
- UpToDate: Clinical features and diagnosis of lower extremity PAD
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