Atrial flutter is an abnormal type of heart rhythm that occurs when the electrical signals in the atria of the heart cause the muscle to beat too quickly. This causes the atria to beat too rapidly and in a disorganized way, which can lead to a decrease in the heart's effectiveness in pumping blood. Atrial flutter can lead to various complications, such as an increased risk of stroke, palpitations, and fatigue. It can also cause an irregular heartbeat and even sudden death. Treatment for atrial flutter can include medications, lifestyle changes, or ablation. The best treatment will depend on the individual and the severity of the condition.