Piggyback heart transplants
"Double hearts are a good choice for patients whose heart problems
cause extremely high blood pressure in the pulmonary artery [...] Such
a problem generally can’t be solved by replacing the ailing heart with
a donor heart because the new one can’t adapt quickly enough to handle
the excess pressure built up in the lungs."
Via Anne:
http://www.lpch.org/newsEvents/NewsReleases/heterotopic.html
