Current status of breathing perfluorocarbon liquids

[JV]

In the past experiments have been done with breathing liquids. Rats did survive up to 20 hours while breathing perfluorocarbons. What is the current status on this? Has it already been tested on people? Or are there major problems?

 

[arildno]

I seem to have heard that some prematurely born babies with underdeveloped lung capacity is given a highly oxygenated fluid to breathe in.
I'm not too sure about this, though..