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Cardiac-related leg ischemia often stems from blood clots, particularly from prosthetic valves or less common conditions like cardiomyopathy and arrhythmias. Prompt diagnosis and treatment are crucial for managing these serious embolic events.
Area of Science:
- Cardiology
- Vascular Medicine
- Thrombosis Research
Context:
- Acute leg ischemia of cardiac origin is frequently caused by emboli from cardiac thrombi.
- Prosthetic valve use and certain cardiac conditions like cardiomyopathy and arrhythmias are significant sources of these emboli.
- While some causes are well-recognized, others require specific diagnostic approaches.
Purpose:
- To elucidate the primary cardiac origins of leg emboli.
- To highlight the diagnostic challenges and key indicators for less common causes of cardiac embolism.
- To differentiate between primary leg emboli and secondary embolic events.
Summary:
- Leg emboli of cardiac origin predominantly arise from left ventricular or left atrial thrombi, often associated with prosthetic valves (4-7% incidence).
- Less common but critical causes include non-obstructive cardiomyopathy and paroxysmal supraventricular arrhythmias, which may present insidiously.
- Other embolic sources like myxoma or infectious endocarditis are also discussed, though less frequent for leg ischemia.
Impact:
- Improved identification of cardiac sources for leg ischemia can lead to more targeted prophylactic and therapeutic strategies.
- Enhanced awareness of subtle cardiac conditions causing embolism may reduce diagnostic delays and improve patient outcomes.
- This review aids clinicians in recognizing diverse embolic etiologies, optimizing patient management and preventing limb-threatening ischemia.
Abstract:
Acute ischemias of the legs of cardiac origin are almost always due to leg embolus caused by fragmentation of an endoauricular or left venticular thrombosis. The two main causes are easily recognized: mitral narrowing and ventricular aneurysm are seldom accompanied by seeding, because a prophylactic treatment with anti-vitamin K is started as soon as the diagnosis is made. Use of prosthetic valves, despite constant improvement in their manufacture and systematic administration of anticoagulant drugs, are always complicated by embolisms (4 to 7% of cases at present). On the other hand, two causes of leg embolisms should be carefully sought since they give rise to revealing seedings. Non-obstructive cardiomyopathy gives a picture of primitive cardiac insufficiency developing progressively. Paroxysmal supraventricular rhythm disorders may be completely overlooked, and only an electrocardiogram continued during 24 hours allows their detection. Embolisms which do not involve the legs, are secondary. Seeding of a chalky fragment from a stenotic aortic valve is very rare. On the other hand, embolisms of anauricular fragment of myxoma and especially membranous embolisms during infectious endocarditis, are not so rare.