Atherosclerotic stenosis of lower extremity arteries — claudication, ABI ≤0.90, optimized with antiplatelet, statin, exercise.
Also known as: PAD, PVD, peripheral arterial disease, claudication, critical limb ischemia
Overview
Atherosclerotic narrowing of the peripheral arteries, most commonly the lower extremities, producing exertional pain (claudication) or, in severe cases, rest pain, tissue loss, and limb-threatening ischemia.
Epidemiology
Affects ~10-15% of adults over 65 in the US. Strongly associated with coronary and cerebrovascular disease; PAD patients have markedly elevated risk of MI and stroke.
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Question 1CardiovascularMedium
A 72-year-old man with a 40-pack-year smoking history reports cramping pain in both calves that comes on after walking two blocks and resolves within a few minutes of rest. Pedal pulses are diminished bilaterally, the feet are cool, and there is loss of hair over the shins. There are no ulcers and no rest pain. The ankle-brachial index is 0.62. Which of the following is the most appropriate first-line therapy?
ASupervised exercise and antiplatelet
BTherapeutic anticoagulation with warfarin
CIntravenous heparin for anticoagulation
DSurgical revascularization with bypass
Reveal answer & full explanation
Correct answer: A — Supervised exercise and antiplatelet
ASupervised exercise and antiplatelet✓
BTherapeutic anticoagulation with warfarin
CIntravenous heparin for anticoagulation
DSurgical revascularization with bypass
Why Supervised exercise and antiplatelet is correct
Calf cramping reproducibly brought on by walking and relieved by rest, with diminished pulses, cool feet, shin hair loss, and an ankle-brachial index of 0.62 (0.41-0.90 = mild-to-moderate disease), is intermittent claudication from peripheral artery disease.
First-line therapy is a supervised/structured exercise program plus antiplatelet therapy (aspirin or clopidogrel) and a statin, with aggressive smoking cessation and risk-factor control (per ACC/AHA peripheral artery disease guidance).
Cilostazol may be added to improve walking distance when symptoms persist.
Why the others are wrong
Therapeutic anticoagulation with warfarin — does not treat atherosclerotic claudication and adds bleeding risk without improving limb outcomes. Trap: confusing arterial atherosclerosis with thromboembolic disease.
Intravenous heparin for anticoagulation — reserved for acute limb ischemia (sudden pain, pallor, pulselessness), which this stable exertional picture is not. Trap: anchoring on 'vascular leg' and over-escalating.
Surgical revascularization with bypass — reserved for lifestyle-limiting symptoms refractory to medical therapy or critical limb ischemia (rest pain, ulcers, ABI <0.40); this patient has neither. Trap: right-diagnosis-wrong-step (premature invasive therapy).
Question 2CardiovascularMedium
A 66-year-old man with peripheral artery disease and an ankle-brachial index of 0.55 one year ago returns with 2 months of progressively severe right foot pain that now occurs at rest, worsens with leg elevation, and improves when he dangles the foot over the bedside. He has a non-healing ulcer on the right great toe. He has no diabetes. The right foot is cool with absent pedal pulses. Repeat ankle-brachial index is 0.32. Which of the following is the most likely diagnosis?
AVenous stasis ulceration
BIntermittent claudication
CNeuropathic ulceration
DCritical limb ischemia
Reveal answer & full explanation
Correct answer: D — Critical limb ischemia
AVenous stasis ulceration
BIntermittent claudication
CNeuropathic ulceration
DCritical limb ischemia✓
Why Critical limb ischemia is correct
Critical limb ischemia — termed chronic limb-threatening ischemia (CLTI) in current ACC/AHA peripheral artery disease guidance — is defined by ischemic rest pain and/or tissue loss with severely reduced perfusion (ABI <0.4); he has all three: rest pain, a non-healing toe ulcer, and ABI 0.32
Pain relieved by dependency and worsened by elevation is classic for severe arterial insufficiency
This stage threatens limb loss within weeks to months; urgent vascular referral for endovascular or surgical revascularization is required, with concurrent wound care
Why the others are wrong
Venous stasis ulceration — venous ulcers sit at the medial malleolus, improve with elevation, and occur with palpable pulses and a normal ABI; each of those features is reversed here (trap: buzzword-matching "leg ulcer" to the most common ulcer type)
Intermittent claudication — claudication is exertional pain relieved by rest; pain at rest plus tissue loss means the disease has progressed beyond claudication (trap: premature closure on his previously known PAD stage)
Neuropathic ulceration — neuropathic ulcers are painless, occur over plantar pressure points, and usually accompany diabetes, which he does not have; his ulcer is painful with absent pulses (trap: confused-with-diabetic-foot-ulcer)
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Atherosclerotic plaque progressively narrows lower extremity arteries. With exertion, demand exceeds the stenosis-limited supply, producing ischemic muscle pain that resolves with rest. Critical limb-threatening ischemia (CLTI) occurs when resting perfusion is inadequate to maintain tissue viability — manifesting as rest pain, non-healing ulcers, or gangrene.
Clinical presentation
Symptoms
Intermittent claudication — cramping, aching, or fatigue in calf, thigh, or buttock with exertion, relieved within 10 minutes of rest
Distance to symptom onset reproducible
Rest pain — burning pain in forefoot at night, relieved by hanging foot off bed (gravity-assisted perfusion)
Ulcers — typically dry, punched-out, on toes, lateral malleolus, or pressure points (contrast with venous ulcers)
Bruits over femoral or iliac arteries
Differential diagnosis
Spinal stenosis (neurogenic claudication) — Pain worse with standing/lumbar extension, relieved by sitting or leaning forward; no improvement with rest while standing; normal pulses
Venous claudication — Bursting calf pain after walking, relieved by elevation; history of DVT; signs of chronic venous insufficiency
Deep vein thrombosis — Unilateral leg swelling, warmth, tenderness, Homan sign; D-dimer and duplex US
Compartment syndrome — Pain out of proportion, paresthesia, pallor, paralysis after trauma or exertion (chronic exertional compartment syndrome)
Popliteal artery entrapment — Young athlete with calf claudication; pulses disappear with plantar flexion; MRA diagnostic
Diagnostic workup
Diagnostic criteria
ABI ≤0.90 at rest is diagnostic of PAD. ABI ≤0.40 indicates severe PAD. Critical limb-threatening ischemia: rest pain >2 weeks, non-healing wound, or gangrene with abnormal hemodynamics (ankle pressure <50 mmHg or toe pressure <30 mmHg).
Myocardial infarction and stroke (PAD doubles risk)
Non-healing infected wounds, sepsis
Restenosis after intervention
PANCE pearls
ABI >1.40 means non-compressible vessels (diabetes, CKD) — get a toe-brachial index instead.
Supervised exercise therapy beats most drugs for claudication distance — prescribe it like a medication.
COMPASS trial: rivaroxaban 2.5 mg BID + aspirin reduces MACE in stable atherosclerosis (CAD or PAD) at the cost of slightly increased bleeding.
Cilostazol is CONTRAINDICATED in heart failure of any severity.
Acute limb ischemia (6 P's) is a vascular emergency — heparin drip and emergent vascular consult; do not wait for imaging.
References
ACC/AHA 2024 PAD — 2024 ACC/AHA/AACVPR/APMA/ABC/SCAI/SVM/SVN/SVS/SIR/VESS Guideline for the Management of Lower Extremity Peripheral Artery Disease (Gornik et al., Circulation 2024)
COMPASS Trial — Rivaroxaban with or without Aspirin in Stable Cardiovascular Disease (Eikelboom et al., NEJM 2017)
VOYAGER PAD — Rivaroxaban in Peripheral Artery Disease after Revascularization (Bonaca et al., NEJM 2020)
CLEVER Trial — Supervised Exercise Versus Stent Revascularization for Aortoiliac PAD (Murphy et al., Circulation 2012)
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