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Cardioembolic stroke: topography and pathogenesis
1Department of Neurology, University of Illinois, Chicago.
Insights
Cardioembolic stroke treatment focuses on preventing clot formation and lysis. Understanding stroke mechanisms and presentation is key for effective management and reducing complications like hemorrhagic transformation.
Area of Science:
- Neurology
- Cardiology
- Vascular Medicine
Background:
- Cardioembolic stroke arises from clots originating in the heart, often causing multiple, large, wedge-shaped infarcts.
- The precise incidence of lacunar infarction from cardioembolism remains unclear.
- Microembolism is detectable, but triggers for symptomatic events are not fully understood.
Purpose of the Study:
- To review the arterial topography, mechanisms, and clinical presentation of cardioembolic stroke.
- To clarify factors influencing thrombus formation and intracranial embolus lysis.
- To discuss treatment strategies including clot prevention and management of post-embolic complications.
Main Methods:
- Literature review focusing on pathogenesis, location, and presentation of cardioembolic stroke.
- Analysis of factors influencing thrombus formation, embolus lysis, and complications.
- Synthesis of current treatment approaches for cardioembolic stroke.
Main Results:
- Cardioembolic stroke typically presents as multiple, bilateral, large, wedge-shaped infarcts.
- Endothelial fibrinolytic properties and site-specific tissue factors influence thrombus formation and complications.
- Treatment strategies involve preventing both red and white clot formation, alongside clot lysis and neuroprotection.
Conclusions:
- Effective management of cardioembolic stroke requires understanding its pathogenesis and location.
- Prevention of red and white clot formation, combined with lysis and neuroprotective agents, is crucial.
- Further research is needed to fully elucidate the mechanisms of symptomatic embolism and lacunar infarction in cardioembolic stroke.
Abstract:
The preventive and acute treatment of cardioembolic stroke is based upon its pathogenesis and location. Typically, cardioembolic cerebral infarction is multiple, bilateral, and often large and wedge shaped. Less frequently, smaller infarcts are produced, but the incidence of lacunar infarction or small cortico-medullary junction infarction due to cardioembolism is uncertain. Microembolism has been detected by Doppler sonography and may be constant, but the factors leading to symptomatic embolism are poorly understood. The natural lytic properties of endothelium play a role in thrombus formation in the heart and embolus lysis intracranially. In addition, site-specific tissue factors may be important in the production of complications occurring in the wake of embolic infarction: hemorrhagic transformation and edema. The treatment of cardioembolic stroke may involve prevention of both red (fibrin-based) and white (platelet-predominant) clot formation as well as a combination of clot lysis and the use of agents to prevent damage due to the final ischemic cascade after embolism has occurred. This review attempts to clarify the arterial topography, mechanism, and presentation of cardioembolic stroke.