Atrial flutter is a common arrhythmia caused by an abnormal electrical circuit in the atria, causing the heart rate to exceed 250 bpm. Common symptoms include palpitations, shortness of breath, and chest discomfort. Treatment options include medications to slow the heart rate, electrical cardioversion, antiarrhythmic drugs, and catheter ablation to scar the flutter circuit. People with atrial flutter have an increased risk of stroke.