Researchers complete first human trial on viability of enteral ventilation

Interesting. Perhaps related? The Ohio river(and probably others) used to have smoke enemas at points for drowning victims. I'm told it's where the phrase 'blowing smoke up your ass' comes from, as people eventually thought it was snake oil/foolish.

So this is about oxygen delivery specifically, but I can't help but wonder if whoever came up with the old idea was onto something...

In the 18th century the Royal Humane Society also put rectal bellows along the banks of the Thames in London for the benefit of the drowned.