Off-pump coronary artery bypass is a form of coronary artery bypass surgery (CABG) performed without cardiopulmonary bypass (heart-lung machine) as a treatment for coronary heart disease.
Off-pump coronary artery bypass was developed partly to avoid the complications of cardiopulmonary bypass during cardiac surgery.  The medical community believed cardiopulmonary bypass caused a post-operative cognitive decline known as postperfusion syndrome (informally called "pumphead"), but research has shown no long-term difference between on and off<unk>  coronary artery bypass.
Off-pump surgery is associated with less blood transfusions, but is more technically challenging. The technique has a steep learning curve, and the quality of the anastomoses is lower, at least until a surgeon has gained much experience.  Off-pump surgery remains a useful technique for some more complicated cases, such as people whose aorta is calcified.
Off-pump coronary artery bypass surgery
Hybrid coronary revascularization
Cardiac resynchronization therapy procedure
Coronary artery bypass surgery
Totally Endoscopic Coronary Artery Bypass Surgery 
Heart transplantation
TAVR procedure
Dextrocardia surgery