What does this mean?
If one or more of the coronary arteries, which supply oxygenated blood to the heart, becomes obstructed by the build up of fatty deposits angina can result and can even cause a heart attack.
A coronary by-pass operation involves inserting a short length of artery or vein, the latter usually taken from the leg, around the narrowed coronary artery thus restoring an adequate supply of blood to the heart.