this is not exactly a total artificial heart - it's biventricular heartmate ii vad placed in tah configuration attached to the native atria (both ventricles removed due to amyloidosis). it is very cool and a revolutionary step forward by dr frazier. a cool quote by dr cohn:"this is just the first shot," cohn said. "what we've kind of done is taken two motorcycles, strapped them together, and called it a car. but it's not really a car. not yet."
dick cheney has a continuous flow heartmate ii lvad.
the pulsatile heartmate i is very rarely used anymore as it's known to have a lifespan of <18 months before bearing failure, and because the continuous flow devices (including heartmate ii) have been demonstrated in rcts to have better reliability and a more favorable adverse event profile.
the time to transplant depends on pt condition; receiving a vad does not mean you cannot be transplanted for several months but usually that does happen because you want the patients to rehab and get stronger from the vad before undergoing another big operation like transplant. plus, sometimes this time permits the heart to rest sufficiently that it recovers and the device can be removed without the need for transplant.