well they are used in emergencies- where the person could die if their airways don’t get opened up- but I’m not sure what they would do if soemone is on ventilator- maybe there’s other ways to keep airways open without steroids- does a tube go right into lungs with ventilator? If so- a person wouldn’t need the rescue inhalers- i woudl think
I think in some cases it gets to the point where they are mechanically oxygenating the blood and there are very few machines available to do that.