Yes. Why do you think your link is the end all and be all to the situation? Here is more from the Loma Linda link mamzelle addressed to me.
Bailey's associates in neonatology and cardiology had too often experienced the heartache of having to tell young parents that there was no hope for their new babies. The only possibility for these babies to live a really normal, active life, he thought, would be a heart replacement. What about animal hearts? (Fifty thousand valves made of calf- and pig-heart tissues were used to replace faulty human-heart valves every year.)
But animal hearts had been tried unsuccessfully in adults on four occasions, the first time by Dr. James Hardy, on January 23, 1964, at the University of Mississippi. He transplanted the heart of a chimpanzee into the chest of a 68-year-old man in a last-ditch effort to save the man's life. But the patient was too weak and died almost immediately. Controlling rejection is usually the greatest challenge in managing a patient following organ transplantation. Rejection in a cross-species transplant would be even more difficult to control than in most human-to-human transplants.
And how is any of what you quoted relvant to failing to attempt to obtain a human heart or even a chimpanzeeheart?