When the atria of the heart beat improperly (
fibrillation) , blood doesn’t flow properly through your heart. This can cause blood to pool
in your heart’s chambers, possibly resulting in blood clots.
These blood clots are not necessary deadly, but they can be. They can travel through the body and cause problems.
For example, a blood clot that blocks blood flow to your brain can cause a stroke, damage to brain cells, or permanent damage to your brain.