Banner image

Atrial fibrillation

A lot of things can make your heart beat faster, like kissing the person you love or watching a scary movie. But sometimes, your heart beats not only faster but also out of rhythm. That can be a problem if this continues over a long period of time and isn't treated. Let's talk about a condition called atrial fibrillation.

If you can listen to your heart through a stethoscope, your heart beat should sound something like this, or lub dub, lub dub, lub dub.

If you have atrial fibrillation, the top two chambers of your heart contract too quickly, and in an irregular pattern. So what you'd hear if you listened through a stethoscope would be more like this. Atrial fibrillation doesn't just sound funny, this irregular beat can prevent your heart from pumping enough blood out to the rest of your body.

Age may cause atrial fibrillation. As you get older, it's more common to have an irregular heartbeat. You're also more likely to have atrial fibrillation if you've had another heart problem, like valve disease, coronary artery disease, or heart failure. Some people get atrial fibrillation because they drink too much alcohol or take certain medicines.

To find out you may have atrial fibrillation . . .

You'll feel your heart race and flutter-and not just once in a while, but often. You may also have trouble breathing and feel tired and dizzy. Your doctor can listen for fluttering while listening to your heart with a stethoscope. You may also need a test that records your heart's rhythms, like an ECG, which you have in your doctor's office, or a Holter monitor that you wear around for a day. Your doctor may also prescribe imaging tests to look at your heart and check whether its electrical system is working properly.

If you do have atrial fibrillation, your doctor can give you medicine to slow your racing heart. Often, the next step is to restore the normal heart rhythm with an electric shock, a process called Cardioversion. However, if the atria haven't been contracting well for 48 hours or more, blood clots may have formed there. These patients are usually given anti-coagulant medicines before Cardioversion to prevent the clots from moving to the brain and causing a stroke when normal rhythm is restored. If Cardioversion doesn't solve the problem, a procedure called Cardiac ablation can be done to destroy the bad areas of your heart that are causing your heart to beat abnormally.

Usually doctors can treat atrial fibrillation so that it becomes a minor nuisance, instead of a big problem. But, the condition can come back, even after it's been treated. If it continues, atrial fibrillation can lead to heart failure. To avoid complications from atrial fibrillation, call your doctor if you're feeling flutters in your chest, and they don't go away.

Review Date: 2/19/2016
Reviewed By: Laura J. Martin, MD, MPH, ABIM Board Certified in Internal Medicine and Hospice and Palliative Medicine, Atlanta, GA. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.

ADAM QualityA.D.A.M., Inc. is accredited by URAC, also known as the American Accreditation HealthCare Commission ( URAC's accreditation program is an independent audit to verify that A.D.A.M. follows rigorous standards of quality and accountability. A.D.A.M. is among the first to achieve this important distinction for online health information and services. Learn more about A.D.A.M.'s editorial policy, editorial process and privacy policy. A.D.A.M. is also a founding member of Hi-Ethics and subscribes to the principles of the Health on the Net Foundation (

The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Call 9-1-1 for all medical emergencies. Links to other sites are provided for information only—they do not constitute endorsements of those other sites. © 1997-2010 A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.