Good informative article written by an internal medicine doctor, on the NY Times.
The reality of what happens to a patient which needs ventilation due to severe respiratory illness is not pretty. Sometimes, even if they survive, there are damages to various body parts and systems.
Good to know beforehand, and decide if you want that kind of treatment if needed, and how far should it go.
https://www.nytimes.com/2020/04/04/opinion/coronavirus-ventilators.html