The SynCardia Total Artificial Heart (TAH-t) is different from the other VADs because it replaces the lower chambers of the heart (ventricles) and the four valves. The TAH-t pumps blood to both the lungs and body. Two tubes (cannulae) come out of the skin and connect to an external machine called a driver. The driver supplies pulses of air to pump blood in and out of the TAH-t. The TAH-t can fit in some larger children, teenagers, and adults. This device is most commonly used for patients who will get a heart transplant.