Atrial flutter is a type of heartbeat problem (arrhythmia) that usually causes a fast heart rate. This fast rate is caused by changes in the electrical system of your heart.

Normally, the heart beats in a strong, steady rhythm. In atrial flutter, a problem with the heart’s electrical system causes the two upper parts of the heart (the right atrium and the left atrium) to flutter, or beat very fast. Atrial flutter might be diagnosed using an an electrocardiogram (EKG). An EKG translates the heart’s electrical activity into line tracings on paper.

This problem can be dangerous. If the heartbeat isn’t strong and steady, blood can collect, or pool, in the atria. And pooled blood is more likely to form clots. Clots can travel to the brain, block blood flow, and cause a stroke. Over time, atrial flutter can also lead to heart failure.

Treatment for atrial flutter helps prevent stroke and heart failure. It also helps relieve symptoms.

Atrial flutter is often caused by another heart condition, such as coronary artery disease or another heart rhythm problem. It may happen after heart surgery.

Many people with atrial flutter are able to live full and active lives.