Treatment

An operation in which the chest and heart are opened surgically while the bloodstream is diverted through a heart-lung (cardiopulmonary bypass) machine

Coronary Artery Bypass Graft performed on a beating heart, ie without using cardiopulmonary bypass (the pump refers to a heart-lung machine)

An operation which requires that the heart be opened in order to perform surgery inside it. These operations almost always necessitate the use of heart lung bypass.