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[Etiology of acute ischemia of the lower limbs]
Insights
The most common causes of acute lower limb ischemia are arterial thrombosis, embolism, and spasm. Embolism often originates from the heart, particularly with atrial fibrillation, while thrombosis relates to chronic vascular disease.
Area of Science:
- Vascular Surgery
- Cardiology
- Emergency Medicine
Context:
- Acute lower limb ischemia is a critical condition requiring prompt diagnosis and management.
- Understanding the etiology of acute limb ischemia is crucial for effective treatment strategies.
Purpose:
- To elucidate the primary causes of acute lower limb ischemia, focusing on arterial origins.
- To detail the specific sources and mechanisms of arterial thrombosis, embolism, and spasm.
Summary:
- Arterial causes, including thrombosis, embolism, and spasm, are the most frequent culprits of acute lower limb ischemia.
- Arterial embolism predominantly stems from the left heart (90%), frequently linked to ischemic heart disease and atrial fibrillation (AF).
- Other embolic sources include aortic/arterial aneurysms and ulcerated plaques, while thrombosis is associated with chronic vascular disease, aneurysms, and thromboangiitis obliterans.
Impact:
- This analysis aids clinicians in identifying the underlying causes of acute limb ischemia, guiding targeted therapeutic interventions.
- Improved understanding of etiologies can lead to better patient outcomes and reduced limb loss.
- Highlights the significance of cardiac evaluation in cases of arterial embolism to the lower limbs.
Abstract:
The most frequent cause of acute ischaemia of the lower limbs is arterial: thrombotic, embolic and spastic. In cases of arterial embolism, the site of origin is the left side of the heart in 9 cases out of 10: ischaemic heart disease in 2/3 of cases, with atrial fibrillation (A.F.) in 50% of cases, rheumatic valvular disease with A.F. in 1/5 of cases and more rarely, idiopathic A.F., auricular disease and cardiomyopathies. Arterial emboli can be fragments from a wall thrombus (aortic or arterial aneurysm), or atheromatous material from an ulcerated plaque. In 11% of cases the origin of the embolus is never found. Arterial thrombosis is due to chronic vascular disease in 1/3 of cases, popliteal aneurysm and thromboangiitis obliterans. The iatrogenic causes are rare: use of the arterial route, and arterial prosthesis, accidental intra-arterial injection during sclerotherapy for varicose veins. Arterial spasm is seen in cases of phlegmatia caerulea dolens. It ben be iatrogenic (ergotamine tartrate, dihydroergotamine, methysergide), toxic (L.S.D.) or spontaneous.