Atrial flutter is a type of abnormal heart rhythm, or arrhythmia, where the upper chambers of the heart, known as the atria, beat rapidly and in a coordinated manner. This condition often results in a fast heart rate, which can lead to symptoms such as palpitations, shortness of breath, and fatigue. Atrial flutter is typically caused by issues like heart disease, high blood pressure, or previous heart surgery. Diagnosis is usually made through an electrocardiogram (ECG), which records the heart's electrical activity. Treatment options may include medications, cardioversion (a procedure to restore normal rhythm), or catheter ablation, a technique that targets the areas of the heart causing the flutter.