Coronary artery bypass graft (CABG) surgery creates a new route for blood to flow around a blocked artery. During a CABG procedure, a surgeon takes a healthy artery or vein from another part of your body — called a graft — and uses it to bypass the blocked artery so blood can flow properly. Depending on the number of blocked arteries you have, you may need more than one bypass. For example, if you’ve ever heard someone say they had triple bypass surgery, that means they had three bypasses created.