I have some personal experience with this via my brother. My brother was in an extended Care place 2 years ago and was in a coma for awhile. He was on the vent for ~ 3 weeks which was very concerning. At one point he had pneumonia. He just wasn't tolerating coming off the vent so it was a long slow process getting him off of it. I will say he seems to be fine 2 years later. Only 1 person so probably not super helpful but in his case it did work out fine