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Published on: January 15, 2017
Cardioembolic stroke: call for a multidisciplinary approach
Eva González Babarro1, Ana Román Rego, José Ramón González-Juanatey
1Department of Cardiology, Hospital Clínico Universitario, Santiago de Compostela, Spain.
Insights
Atrial fibrillation (AF) significantly increases stroke risk, but risk varies. Anticoagulation is recommended for high-risk AF patients, while blood pressure control is crucial for prevention.
Area of Science:
- Cardiology
- Neurology
- Pharmacology
Background:
- Cardioembolic stroke is a major cause of ischemic stroke, with atrial fibrillation (AF) being a primary cardiac source.
- The stroke risk associated with AF exhibits significant variability, necessitating effective risk stratification.
- The CHADS2 index is a widely validated tool for assessing stroke risk in AF patients.
Purpose of the Study:
- To review current strategies for managing stroke risk in patients with atrial fibrillation.
- To evaluate the role of antithrombotic therapy based on stroke risk assessment.
- To discuss the implications of rate versus rhythm control and blood pressure management in AF.
Main Methods:
- Review of clinical studies and guidelines on atrial fibrillation management.
- Analysis of risk stratification tools like the CHADS2 index.
- Evaluation of evidence for antithrombotic therapies and antihypertensive agents.
Main Results:
- Antithrombotic therapy decisions (antiplatelets vs. anticoagulation) are guided by annual stroke risk (e.g., >2.5% warrants anticoagulation).
- Rate control strategies for AF are comparable or superior to rhythm control regarding survival and quality of life.
- Optimal blood pressure control is vital; hypertension increases stroke risk significantly (by 12-fold).
- ACE inhibitors and ARBs may reduce AF recurrence, particularly with cardiac dysfunction or hypertrophy.
Conclusions:
- Risk stratification is essential for guiding antithrombotic therapy in AF patients.
- Rate control is a recommended management strategy for AF.
- Effective blood pressure management, including specific antihypertensive agents, plays a key role in preventing stroke in AF.
Abstract:
Cardioembolic stroke accounts for one third of all ischemic strokes, and atrial fibrillation (AF) is the cardiac source of emboli in 50% of them. However, the absolute risk of stroke associated with AF has enormous variability, and several clinical risk stratification schemes have been proposed. One of the most validated and used in clinical practice is the CHADS2 index, characterized by its simplicity and rapid application. Current recommendations about antithrombotic therapy in AF patients are based on assessment of annual risk of stroke; thus, antiaggregation is indicated in patients with a low risk, and anticoagulation is prescribed when annual risk is greater than 2.5%. Relevant studies comparing rate and rhythm control do not defend achievement and maintenance of sinus rhythm as a routine management of AF patients and demonstrate that rate control is comparable or even better than rhythm control in terms of survival and quality of life. Optimal control of blood pressure is a relevant factor in preventing cardioembolic stroke in AF patients, because hypertension multiplies the risk of stroke by 12. Antihypertensive drugs such as angiotensin-converting enzyme inhibitors and angiotensin II receptor blockers proved to reduce AF recurrences, especially in the context of left ventricular dysfunction and ventricular hypertrophy.
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