Atrial Fibrillation

What is attrial fibrillation?

Atrial fibrillation (AF) is a heart condition where the upper chambers of the heart (atria) beat too fast and with chaotic rhythm (fibrillation). This condition can cause blood to pool and form clots in an area of the heart called the left atrial appendage (LAA). If a blood clot travels through an artery to the brain, it can cause a stroke. People with atrial fibrillation have a much greater risk of stroke.1