Lyric discussion by Geissler 

Cover art for The Operation lyrics by Charlotte Gainsbourg

The first time I heard it, the final line made my jaw drop. "The heart was rejected by the host" - this seems to reveal that the song is not describing a medical operation, as it appears on first listen, but the preparation of a meal...

Uhhh, what? "The heart was rejected to the host." This happens all the time in surgeries, afterward. The transplanted organ will be rejected by the host. Usually happens when you don't have the right type (i.e. marrow transfusions.)

@Geissler i think ur misunderstanding the word host as someone who is having people at their house for dinner. it can also mean the recipient of a transplant hence they are the host to the new organ inside their body much like the owner of the house is a host to the people inside their house