Atrial flutter is a form of irregular cardiac rhythm that, if left untreated, can lead to various complications, such as an increased risk of stroke. Nonetheless, there are treatments that can be attempted. You may be able to return your heart rhythm to normal with the help of some medications and surgeries. A kind of supraventricular arrhythmia, also known as atrial flutter, atrial flutter is an irregular cardiac rhythm that originates in the upper chambers of the heart rather than the ventricles. In this particular instance, the rate of your heartbeat is excessive.