Atrial fibrillation is an abnormal and irregular heartbeat, or heart rhythm. Caused by erratic electrical signals, atrial fibrillation occurs in the heart’s upper chambers, the atria. It causes the atria to beat so fast that they cannot contract fully, and properly circulate blood. The atria are not able to pump blood to the heart's lower chambers, the ventricles. These factors, in turn, cause other negative effects:
Atrial fibrillation is a progressive disease. If it is not treated, it progresses to a more advanced stage. The stages include the following.
More Advanced Stages
Atrial fibrillation is the most common type of abnormal heartbeat, or heart rhythm. Today atrial fibrillation occurs in about 33 million people worldwide.1 In the U.S, it is estimated to occur in about 8 million people. By 2030, about 12 million people in the U.S. will have it.2
Atrial fibrillation is more common in people age 60 and older. This makes it an increasing problem in the U.S. and in many other countries that have a large percentage of an aging population.
In addition, health experts in the U.S. say we currently have epidemics not just of obesity, but of heart disease and diabetes, too.3-5 All of these health conditions put a person at higher risk of atrial fibrillation. Read more.
People with paroxysmal atrial fibrillation often have palpitations. This is a fluttering feeling in the chest, or a feeling of a rapid, irregular heartbeat.
People in a more advanced stage of atrial fibrillation are more likely to have these symptoms:
Your health care provider will start out by getting information about your medical history. He or she will likely:
Other tests may be done by a cardiologist (heart doctor). Longer term testing of your heart can be done with monitors you either wear for a short time or have implanted in your chest for a long time. Examples of longer term testing methods include:
More advanced tests may be done by a cardiologist or electrophysiologist. (An electrophysiologist specializes in the heart’s electrical system.)
Yes, many people need more than one test to diagnose atrial fibrillation. If you do have atrial fibrillation, a more advanced test might be done as part of treatment. For instance, if you have a catheter ablation, an EP study is done to see exactly where the atrial fibrillation begins in the heart. This allows the doctor to know precisely where to apply the treatment.
Most people will start by talking about symptoms with their primary health care provider. But for proper treatment of atrial fibrillation, you should see a cardiologist or electrophysiologist. (A cardiologist specializes in the heart. An electrophysiologist specializes in the heart’s electrical system.) Many people with atrial fibrillation see both types of specialists.
It varies from one person to another. But there are 3 general areas where atrial fibrillation often begins:
Cells at the top of the heart create electrical signals that travel along pathways in the heart. When the electrical pathways are working properly, you have a normal heart rhythm. The electrical pathways allow the heart to pump blood to all parts of the body. But sometimes the electrical signals go awry, and the heart beats abnormally. Atrial fibrillation is the most common abnormal heart rhythm.
Certain health conditions or lifestyle choices put some people at higher risk for atrial fibrillation. Read the following 2 Q&As for more information.
These medical conditions put people at higher risk for atrial fibrillation:
There are also cardiovascular (heart and blood vessel) problems that raise the risk for atrial fibrillation:
Yes, and you have no control over a couple of these factors:
Stress is another factor. It’s important to control stress as much as you can. Other things that can trigger atrial fibrillation are related to choices people make:
Yes, someone with atrial fibrillation is 5 times more likely to have a stroke.6 Atrial fibrillation causes the atria to beat so fast that they cannot contract fully, to properly circulate blood to the rest of the heart. This leaves blood pooling in the atria, instead of flowing into the ventricles. When blood pools, it can clot. If a blood clot travels to the brain, it can cause a stroke. Find out more, such as who may be at especially high risk.
Atrial fibrillation causes physical changes in the heart. The walls of the atria become scarred, stretched out, and more stiff than in a healthy heart. These changes lead to uncoordinated pumping of the atria and ventricles. This uncoordinated pumping can contribute to heart failure. Read more about how atrial fibrillation may lead to heart failure.
Yes, atrial fibrillation can also lead to long-term fatigue as well as dementia. There may be other changes in lifestyle that impact health too: many hospital or clinic visits, and too little activity due to fatigue. All of these issues can diminish a person’s quality of life. As a result, some people may develop anxiety or even depression. Learn more details about these other health problems.
1. Rahman, F., Kwan, G. F., & Benjamin, E. J. (2014). Global epidemiology of atrial fibrillation. Nature reviews cardiology, 11(11), 639–654. https://doi.org/10.1038/nrcardio.2014.118
2. Colilla, S., Crow, A., Petkun, W., Singer, D.E., Simon, T., Liu, X. (2013) Estimates of current and future incidence and prevalence of atrial fibrillation in the U.S. adult population. American journal of cardiology, 112(8), 1142-1147. doi: https://doi.org/10.1016/j.amjcard.2013.05.063
3. American Academy of Family Physicians. (2018, October 15). New report shows U.S. obesity epidemic continues to worsen. https://www.aafp.org/news/health-of-the-public/20181015obesityrpt.html
4. Dalen, J.E., Alpert, J.S., Goldberg, R.J., Weinstein, R.S. (2014). The epidemic of the 20th century: coronary heart disease. American journal of medicine, 127(9), 807-812. DOI:https://doi.org/10.1016/j.amjmed.2014.04.015
5. Centers for Disease Control and Prevention. (2020). National Diabetes Statistics Report, 2020. https://www.cdc.gov/diabetes/library/features/diabetes-stat-report.html
6. Benjamin, E.J., Muntner, P., Alonso, A., Bittencourt, M.S., Callaway, C.W., Carson, A.P., Chamberlain, A.M., Chang, A.R., Cheng, S., Das, S.R., Delling, F.N., Djousse, L., Elkind, M.S.V., Ferguson, J.F., Fornage, M., Jordan, L.C., Khan, S.S. ... Virani, S.S., and On behalf of the American Heart Association Council on Epidemiology and Prevention Statistics Committee and Stroke Statistics Subcommittee. (2019). Heart Disease and Stroke Statistics—2019 Update: A Report from the American Heart Association. Circulation, 139, e56–e528. https://doi.org/10.1161/CIR.0000000000000659