So my girlfriend was watching a documentary on Rome earlier today and the episode was about Caligula. The documentary mentioned that Caligula slipped into a several month coma before waking up.

How did the doctors of the time manage to provide his body with nutrients? I don't know anything about coma's, but would they have been able to feed/hydrate a coma-patient before transfusions? If so, did they just force-feed them?