Complications

Blood clots are a dangerous complication of atrial fibrillation that can lead to stroke.

In atrial fibrillation, the chaotic heart rhythm can cause blood to collect in the heart's upper chambers (atria) and form clots. If a blood clot in the left upper chamber (left atrium) breaks free from the heart area, it can travel to the brain and cause a stroke.

The risk of stroke from atrial fibrillation increases as you grow older. Other health conditions also may increase your risk of a stroke due to A-fib, including:

• High blood pressure
• Diabetes
• Heart failure
• Some valvular heart disease

Blood thinners are commonly prescribed to prevent blood clots and strokes in people with atrial fibrillation.