Atrial Fibrillation (AF, or Afib) is the most common heart rhythm disturbance, affecting over half a million people in the UK alone. With advancing age AF starts to become increasingly prevalent, approximately 1% of the general population, and 8% of the over-80s. However younger adults may also develop AF for a variety of reasons. It is also commonly associated with, and complicated by, heart failure and strokes. Predisposing factors for the development of AF include high blood pressure, heart disease including valvular disease, coronary disease and previous heart attacks.