What is the definition or description of: cardiac surgery?

Surgery of heart: Cardiac surgery refers to heart surgery. This can be for bypass blocked arteries, repairing leaking valves, replacing valves, closing holes, fixing birth defects of the heart, removing tumors of the heart, and transplants. There are even more but i think you get the idea. It requires a specialized team of surgeons, anesthesiologists, nurses and support staff. Often a heart lung machine is needed.

Heart surgery: Cardiac surgery is any surgery on the structures of the heart, including the main chambers, valves, and blood supply.

Heart Operation: Cardiac surgery is used to describe a subset of thoracic (chest) surgery. It refers to operations on the heart and great vessels (thoracic aorta, pulmonary artery, pulmonary veins, vena cava, and ductus arteriosis). In contrast, operations on the lungs, esophagus, and chest wall are often referred to as "general thoracic surgery.".