The advancments in medicine over the years is just outstanding. My son was born with a esophagus defect that prevented him from eating (TEF). By no means the seriousness of a heart transplant but just another example of how advanced in medicine we are. He had surgery for it and was in the hospital for a month before we got him home. Like you say Sam, you would never know.
Cheers to the Doctors, Donors and patients of all ages!