Atrial flutter is an abnormality in the beating of the heart. Take a comprehensive look at the causes, symptoms, diagnosis, and treatment of atrial flutter and atrial fibrillation.

Atrial flutter is similar to another type of arrhythmia called atrial fibrillation (AFib). Both start in the upper chambers of the heart and cause a fast heartbeat and increase your risk of stroke.

Atrial Flutter Diagnosis and Treatment Atrial flutter is diagnosed based on your medical and family history, a physical exam, and an EKG, according to the Merck Manual.