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Brain embolism - Answers to practical questions

José M Ferro1

  • 1Stroke Unit, Neurology Department, Centro de Estudos Egas Moniz, Hospital de Santa Maria, 1649-035 Lisboa, Portugal. jmferro@iscvt.com

Journal of Neurology
|February 8, 2003
PubMed

Insights

Cardioembolic stroke, often severe and recurrent, stems from heart conditions like atrial fibrillation. Documenting the source requires advanced imaging and tests, with anticoagulation underutilized despite its preventive potential.

Area of Science:

  • Neurology
  • Cardiology
  • Medical Imaging

Background:

  • Cardioembolism constitutes approximately 25% of ischemic strokes, often leading to severe outcomes and high recurrence rates.
  • Identifying the precise source of cardioembolic stroke can be challenging despite clinical suspicion.
  • Non-valvular atrial fibrillation is the most frequent cause of cardioembolic stroke, with aortic arch atheroma emerging as a significant source.

Purpose of the Study:

  • To review the diagnostic modalities for identifying cardioembolic stroke sources.
  • To discuss the clinical implications and management strategies for cardioembolic stroke.
  • To highlight the underutilization of oral anticoagulation in patients with atrial fibrillation.

Main Methods:

  • Review of diagnostic tools including magnetic resonance imaging (MRI), transcranial Doppler (TCD), echocardiography, Holter monitoring, and electrophysiological studies.
  • Analysis of embolic risk factors such as non-valvular atrial fibrillation and aortic arch atheroma.
  • Evaluation of treatment guidelines regarding anticoagulation for acute cardioembolic stroke and atrial fibrillation.

Main Results:

  • Various imaging and electrophysiological studies aid in documenting cardioembolic sources.
  • Non-valvular atrial fibrillation is the predominant cause, yet oral anticoagulation is underprescribed in at-risk patients.
  • Patent foramen ovale carries a low embolic risk unless associated with atrial septal aneurysm.

Conclusions:

  • Accurate documentation of cardioembolic stroke sources relies on a combination of advanced diagnostic techniques.
  • There is a significant gap in the prescription of oral anticoagulation for patients with atrial fibrillation.
  • Routine immediate anticoagulation for acute cardioembolic stroke is not supported by current evidence.

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