Atrial fibrillation is chaotic and irregular atrial arrhythmia, the prevalence of which increases progressively with age. It causes significant morbidity and death. Many patients are asymptomatic or have symptoms that are less specific for cardiac arrhythmias, such as mild dementia or silent strokes. 

Gregory Lip, Price-Evans Chair of Cardiovascular Medicine, University of Liverpool, gives us an overview of the condition.

Read more on Atrial Fibrillation at BMJ