Aortic stenosis is a common form of heart valve disease in which the aortic valve - the main valve through which the heart pumps blood to the body, becomes narrowed and restricted, obstructing the flow of blood. This leads to symptoms of fatigue, breathlessness, chest pain, light-headedness, and blackouts. If left untreated, aortic stenosis can be fatal. Indeed, this condition has an outlook worse than most cancers. Fortunately, aortic stenosis can be safely and effectively treated by a procedure to replace the narrowed valve, either by open-heart surgery (surgical aortic valve replacement (SAVR), or by a much less invasive keyhole technique known as trans-catheter aortic valve implantation (TAVI). However, it is vital that patients are diagnosed and treated rapidly. This is one of the key goals of the Valve for Life programme.