Atrial flutter (AFL) is a common abnormal heart rhythm that starts in the atrial chambers of the heart. When it first occurs, it is usually associated with a fast heart rate (100 to 200 heartbeats per minute), and is classified as a type of supra-ventricular tachycardia. Although this abnormal heart rhythm may occur spontaneously in people with otherwise normal hearts, it can occur in individuals with cardiovascular disease (e.g. high blood pressure, coronary artery disease, and cardiomyopathy) and heart complications from diabetes mellitus, It is typically not a stable rhythm, and often degenerates into atrial fibrillation (AF). However, it does rarely persist for months to years. Treatment includes ablation which is very effective.