AFib happens when rapid, irregular, disorganized electrical signals run through the atria, the heart's two upper chambers.
This causes the atria to quiver, or "fibrillate," which means the muscles of those chambers are contracting too quickly and irregularly, giving you the sensation that your heart is pounding too fast or out of control.
How is this related to stroke risk?
When the heart's upper chambers don't contract in a regular rhythm to completely force blood through to the heart's lower chambers [ventricles], this leaves some blood behind in the atria.
The blood tends to clot. Then clots can start forming on the atrium wall. They grow and little pieces can break off and get into your bloodstream.
Then a clot can get to the brain and cause a stroke.
How can people reduce their risk of atrial fibrillation and stroke?
Diet, exercise and weight reduction – healthy lifestyle [practices] will help [ward off] atrial fibrillation.
"Listen to your heart" is the best advice I can give. Know what the symptoms of AFib are and see a doctor when something doesn't seem right.
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