Acute limb ischemia and chronic arterial insufficiency !

Syndrome

A leg that suddenly turns cold, pale and pulseless is an emergency; pain on walking that stops with rest is the chronic form.

Updated 2026-11-01

See it in 3D: Abdominal aorta · Femoral artery · Popliteal artery · Posterior tibial artery · Dorsalis pedis artery

What it is

Arterial ischemia of a limb can be acute, from an embolus or thrombosis that closes the artery within minutes or hours, or chronic, from progressive atherosclerosis. The acute form threatens limb viability within hours; the chronic form presents as claudication, rest pain and ulcers.

Key findings

The six Ps of acute ischemia: pain, pallor, pulselessness, paresthesia, paralysis and poikilothermia (coldness).
Paresthesia, weakness or muscle rigidity: advanced ischemia threatening the limb.
Chronic: intermittent claudication, night pain relieved by hanging the leg down, shiny hairless skin, thick nails, weak or absent pulses.
Pallor on elevation and rubor on dependency (Buerger test); slow capillary refill.
Arterial ulcer: toes and pressure points, punched-out edges, painful, pale base. Venous ulcer: medial malleolus, less painful, with edema and pigmentation.

Pathophysiology

Acute: muscle and nerve tolerate little time without flow; loss of sensation and movement means a threatened limb.
Embolism: the embolus (usually from the heart) lodges at a bifurcation with no prior collaterals: sudden onset.
Chronic: atherosclerotic stenosis limits flow with exercise (claudication) and, as it progresses, at rest; collaterals develop.
Claudication appears in the muscle group below the lesion: calves (femoropopliteal), buttocks and thighs (aortoiliac).

Common causes

Acute embolic: atrial fibrillation, recent infarction with mural thrombus, endocarditis.
Acute thrombotic: thrombosis on an existing plaque (prior claudication), thrombosed popliteal aneurysm.
Arterial trauma (knee fractures and dislocations) and dissection.
Chronic: atherosclerosis from smoking, diabetes, hypertension, dyslipidemia and older age.

Tests that confirm it

Ankle–brachial index for the chronic form; Doppler and CT angiography to localize the lesion.
In the acute form urgent vascular assessment is not delayed for tests.
Diabetic neuropathy can hide pain, and calcified arteries give a falsely normal index.

Test yourself

Think of the answer, then tap the question to see it.

What are the six Ps of acute limb ischemia?

Pain, pallor, pulselessness, paresthesia, paralysis and poikilothermia (coldness).

Which findings mean a limb with acute ischemia is threatened?

Loss of sensation and muscle weakness or paralysis.

Which arrhythmia is the most common source of arterial emboli to the legs?

Atrial fibrillation, through thrombi in the left atrial appendage.

How is an arterial ulcer told from a venous one?

The arterial ulcer is on the toes or pressure points, very painful, with punched-out edges; the venous ulcer is usually at the medial malleolus, with edema and pigmentation.

Add to my cards (4)

See it in 3D

The structures of Durgical's 3D anatomy where it is found.

← All of the clinical exam

Educational content on the clinical exam; it is learned and practised under supervision. It does not replace assessment by a health professional and is not for self-diagnosis.

Sources: Peripheral artery disease - legs: MedlinePlus Medical Encyclopedia (MedlinePlus, U.S. National Library of Medicine, 2026); 6.4 Bedside Physical Assessment in Medical-Surgical Nursing - Medical-Surgical Nursing | OpenStax (OpenStax (Rice University), 2024); 24.3 Nursing Assessment - Clinical Nursing Skills | OpenStax (OpenStax (Rice University), 2024).

Spotted a mistake?We are always improving for the community. Tell us what is wrong and our team will review it.Report a mistake

Representative model, for educational purposes only.