**2. Coronary artery bypass graft surgery**

A coronary artery bypass surgery is a surgical procedure performed to relieve angina and reduce the risk of death from coronary artery disease. Arteries or veins from elsewhere in the patient's body are grafted to the coronary arteries to bypass atherosclerotic narrowings and improve the blood supply to the coronary circulation supplying the myocardium (heart muscle). Example, Left internal mammary artery (LIMA) graft to LAD and SVG to OM and RCA (figure 1). The operation is usually performed with the heart stopped, requiring the usage of cardiopulmonary bypass; other methods are available to achieve CABG on a beating heart, so-called "off-pump" surgery. [3].

© 2013 Balghith; licensee InTech. This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. © 2013 The Author(s). Licensee InTech. This chapter is distributed under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
