Atrial fibrillation (AFib) increases the risk of stroke because the irregular heart rhythm can cause blood to pool in the heart’s upper chambers, allowing clots to form. If a clot travels to the brain, it can block blood flow and cause a stroke, which is often more severe in people with AFib.
How Does AFib Affect My Stroke Risk?
Your heart relies on an electrical signaling system to coordinate when each chamber contracts and relaxes. This process allows blood to move efficiently throughout the body.
When you have atrial fibrillation (AFib), the heart's electrical signals become rapid and irregular. As a result, the upper chambers of the heart, known as the atria, do not contract normally. Instead of moving smoothly through the heart, blood can collect or "pool" within the left atrium.
How AFib Can Lead to Stroke
When blood pools in the heart, it increases the risk of blood clot formation. These clots can break away from their original location and travel through the bloodstream.
If a clot reaches the brain and blocks a blood vessel, it can prevent blood flow to part of the brain and cause a stroke.
AFib is a significant risk factor for stroke:
- Approximately one in four strokes is associated with AFib.
- Some people with AFib have a stroke risk that is up to five times higher than those without AFib.
- Strokes related to AFib are often more severe and can result in greater long-term disability.
Reducing Stroke Risk
Your healthcare provider will evaluate your individual stroke risk and discuss treatment options that may help lower that risk. Preventing stroke is an important part of managing AFib, particularly for people who have additional risk factors.
For many patients, anticoagulant medications, commonly called blood thinners, are a key component of treatment. These medications help prevent blood clots from forming or becoming larger, significantly reducing the likelihood of a stroke caused by a blood clot.
Taking blood thinners exactly as prescribed is one of the most effective ways to reduce AFib-related stroke risk.
Understanding the Risks of Blood Thinners
While blood thinners can be highly effective, they can also increase the risk of bleeding and bruising. Depending on the medication prescribed, your healthcare team may monitor your blood to ensure the treatment is working safely and effectively.
Your provider may also recommend adjustments to certain activities that could increase your risk of injury or bleeding. In addition, they can help you understand which side effects, such as minor bruising or mild bleeding, may be expected and when medical attention may be needed.
Making the Right Decision for You
Choosing whether to take a blood thinner involves balancing the risk of stroke against the potential risk of bleeding. Your healthcare team can help you understand both risks and guide you through the decision-making process.
If you have concerns about stroke prevention or anticoagulant medications, talk openly with your provider. Together, you can determine the treatment strategy that best fits your health needs, lifestyle, and personal preferences.