You can sign a patient out at any time. They will threaten you with going AMA....but you can still do it. They should take this man to another hospital.
Not sure how you sign someone out who is on a vent though. Good Lord, what a disaster for this family.
Hospitals have a way of keeping you there. One is IV insertions. I was in a hospital where they put (needlessly, IMO) a multi-line IV tap line down my neck directly into my aorta. Damned difficult to remove without willing staff. And, guess what’s ALWAYS last to be removed? As in after you’ve been given the Dr’s discharge okay...