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Atrial fibrillation and cardioembolic stroke
1Stroke Unit, Neurology Service, Santa Maria Hospital, Faculty of Medicine, University of Lisbon, Lisbon, Portugal. jmferro@fm.ul.pt
Minerva Cardioangiologica
|June 15, 2004
Summary
Atrial fibrillation (AF) significantly increases stroke risk, especially in the elderly. Anticoagulation therapy is crucial for preventing strokes in AF patients, despite underutilization due to physician knowledge gaps and risk underestimation.
Area of Science:
- Cardiology
- Neurology
- Pharmacology
Background:
- Atrial fibrillation (AF) is a major cause of disabling stroke, particularly in the elderly, increasing stroke risk six-fold.
- Strokes associated with AF are often severe, with high fatality and recurrence rates.
- Identifying cardiac origin of stroke involves medical history, clinical examination, and neuroimaging.
Purpose of the Study:
- To highlight the significant stroke risk in atrial fibrillation (AF) patients.
- To outline risk factors for stroke in AF.
- To emphasize the importance and underutilization of anticoagulation therapy in AF.
Main Methods:
- Review of stroke risk factors in AF patients.
- Analysis of the benefits and risks of anticoagulation versus aspirin therapy.
- Discussion of physician knowledge and attitudes towards anticoagulation.
Main Results:
- AF increases stroke risk by at least 6-fold, with strokes often being severe and recurrent.
- Key risk factors include age, previous embolism, structural heart disease, hypertension, and diabetes.
- Anticoagulation prevents significantly more ischemic strokes than aspirin causes major bleeding, yet remains underused.
Conclusions:
- Long-term anticoagulation is indicated for all AF patients with a history of TIA or stroke.
- Underutilization of anticoagulants stems from physician underestimation of benefits and overestimation of risks.
- New anticoagulants requiring less monitoring may improve treatment rates in AF patients at risk for stroke.