A stroke is sometimes called a brain attack. But for some people, the origins of stroke can actually be traced to another of the body's major organs—the heart.
According to the American Heart Association (AHA), 15 to 20 percent of strokes are linked to atrial fibrillation (AF), a heart rhythm disorder that affects at least 2.7 million Americans.
In AF the electrical signals that coordinate the muscles of the heart's two upper chambers, the atria, become rapid and disorganized. As a result, the atria quiver instead of beating as they should. This causes blood to pool, enabling clots to form. If part of a clot leaves the heart, it may block the flow of blood to the brain and cause a stroke.
Other heart problems or high blood pressure increases a person's risk for the condition. Lung problems, thyroid disorders, heavy alcohol consumption, smoking and use of stimulant drugs, including caffeine, can increase risk as well. In many cases, however, the cause of AF remains unknown.
It's possible to have AF without realizing it. But some people might notice their heart racing or flopping in their chest.
Other possible signs may include:
If you have these symptoms, it's important to bring them to your doctor's attention promptly.
If your doctor confirms that you have AF, the AHA recommends treating it aggressively. Medication to help prevent blood clots may be prescribed. Other possible treatments include:
Treatment may lower your stroke risk significantly, the AHA reports.