http://health.usnews.com/health/best-hospitals/heart-and-heart-surgery-hospital-rankings/
Sorry, I forgot to post the link above, but here it is.
He needs a second opinion, at the very least. It would be great if he could go to a nationally known heart center such as Cleveland Clinic (that sponsors this site), Mayo Clinic, Texas Heart Institute, Debakey Center, or some place like that -- someplace where the doctors are used to seeing the very worst cases. Things are different at the centers where patients come from all over the world as a last resort, after their local doctors have told them that they can't do anything more for them. Here is a link to the US News and World Report list, which will give you an idea of some of the facilities in the US that are considered great. If he isn't able or willing to go to one of these centers (and I don't even know if your friend lives in the US), perhaps he can at least get a local second opinion. I will say, he is lucky to have a friend who cares about him as much as you do.