https://www.liebertpub.com/doi/full/10.4187/respcare.01956...
User Shop_Infamous, in the Anesthesiology: Professionals Keeping Patients Safe, Asleep, and Comfortable subreddit,
https://www.liebertpub.com/doi/full/10.4187/respcare.01956…
https://www.liebertpub.com/doi/full/10.4187/respcare.01956…
There are some studies on long term poor prognosis, not sure how strong a correlation though [here](http://www.ncbi.nlm.nih.gov/p…