AF Information & Advice For Patients

What are the risks of AF?

AF-related stroke

The main risk associated with AF is stroke. This occurs because when a person is in AF, the atria (the top chambers of the heart) are fibrillating and not beating in a co-ordinated way. The lack of sufficient contraction means that the blood in parts of the atria becomes stagnant and can form clots. These clots can break off and travel anywhere in the body, but most worryingly, they can travel to the brain and cause a stroke. AF-related strokes are often more damaging than other kinds of stroke. A doctor will assess your personal risk of stroke when you have been diagnosed. The chart below can help you to also do this:

Question Points Your Score
Do you have congestive heart disease?     1  
Do you have hypertension (high blood pressure)?     1  
Are you over 75?     2  
Do you have Diabetes?     1  
Have you suffered a stroke (even a mild stroke)?     2  
Do you have vascular heart disease?     1  
Are you aged between 65 and 74 years?     1  
Are you female and over 65?     1  
                                                                                    Total score  

Your annual risk of stroke rises from under 2% a year with no risk factors to over 10% a year for five or six. Experts who use this scoring scheme (the CHA2DS2-VASc score) may suggest that the tipping point for benefitting from taking anticoagulants over their risks is at a score of 2 or above. However, there are situations where, even with a score of less than 2, anticoagulation may be recommended.

If you’ve been diagnosed with AF please use the AF stroke risk calculator to work out a personal estimate of your stroke risk. The tool collects vital information on your health and provides a print out of information that you and your doctor will be able to use when assessing the potential need for treatment to reduce your risk of stroke because of AF.

Heart Failure

Having an uncontrolled heart rate for long periods of time (weeks or months) can damage the heart and you should check with your doctor that your heart rate is controlled adequately. In extreme cases, often when the rate is very fast or when it happens in a damaged heart, AF can cause heart failure, which means that the heart becomes weak, as a result of the rapid rhythm. As the heart weakens, blood flows back into the lungs and affects the normal breathing pattern.

AF is also associated with a slightly increased risk of death although this is a very small risk and generally AF is not considered a life threatening disease in its own right. Why AF is associated with increased risk of death is not understood.


AF may cause angina to occur or increase in frequency.

Reduce your risk of AF-related stroke

You can lower your AF-related stroke risk by:

  • Managing any other medical conditions such as diabetes, high blood pressure or high cholesterol
  • Exercise regularly
  • Stop smoking
  • Drink alcohol in moderation
  • Eat a balanced healthy diet
  • Ask for regular check ups with your GP

Get in touch for more help and information

01789 867


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