Atrial Fibrillation Also called: AF, AFib Summary An arrhythmia is a problem with the speed or rhythm of the heartbeat. Atrial fibrillation (AF) is the most common type of arrhythmia. The cause is a disorder in the heart’s electrical system. Often, people who have AF may not even feel symptoms. But you may feel Palpitations — an abnormal rapid heartbeat Shortness of breath Weakness or difficulty exercising Chest pain Dizziness or fainting Fatigue Confusion AF can lead to an increased risk of stroke. In many patients, it can also cause chest pain, heart attack, or heart failure. Doctors diagnose AF using family and medical history, a physical exam, and a test called an electrocardiogram (EKG), which looks at the electrical waves your heart makes. Treatments include medicines and procedures to restore normal rhythm. 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National Heart, Lung, and Blood Institute Reference Desk Cardiovascular Glossary Texas Heart Institute Heart and Stroke Encyclopedia American Heart Association How the Heart Works National Heart, Lung, and Blood Institute Clinical Trials ClinicalTrials.gov: Atrial Fibrillation National Institutes of Health Encyclopedia Digitalis toxicity Heart palpitations Diagnosis and Tests Electrocardiogram National Heart, Lung, and Blood Institute Holter and Event Monitors National Heart, Lung, and Blood Institute How Is Atrial Fibrillation Diagnosed? National Heart, Lung, and Blood Institute Pulse Check: The Importance of Self-Screening for Atrial Fibrillation Twice a Year Women’s Heart Foundation Recognizing an Irregular Heart Rhythm American Osteopathic Association Stress Testing National Heart, Lung, and Blood Institute Transesophageal Echocardiography National Heart, Lung, and Blood Institute Genetics Genetics Home Reference: familial atrial fibrillation National Library of Medicine Living With Living with Atrial Fibrillation National Heart, Lung, and Blood Institute Journal Articles Atrial Fibrillation Specifics Tachycardia Mayo Foundation for Medical Education and Research Symptoms What Are the Signs and Symptoms of Atrial Fibrillation? 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