My wife works in the ICU with loads of vent patients. She loves it. Works quickly and effectively, then wears off in 5-10 minutes.
We found out though, other hospitals didn't share the same sentiment.
Had her dad on a vent in a local community hospital who had in formulary but rarely used it due to it's cost.
You can find more info on it here:
http://www.diprivan.com/
Andrew Lopez, RN
http://www.nursinga2z.com