An<unk>  is a prosthetic device that is implanted into the body to replace the biological  heart. It is distinct from a cardiopulmonary bypass machine (CPB), which is an external device used to provide the functions of both the heart and the lungs. The CPB oxygenates the blood, and therefore does not need to be connected to both blood circuits. Also, a CPB is  suitable only for a few hours use, while<unk> s have been used for periods longer than a year (as of 2007).
Artificial heart
Ventricular assist device
Heart transplantation surgical procedure
Cardiomegaly surgery
Endocarditis surgery
Right heart failure surgery
Ventricular tachycardia surgery
Dextrocardia surgery