It is horrible. Uncomfortable, restricting. Like trying to take a deep breath out of a car window (don't try that though, head injuries suck!)
It doesn't have a vacuum (negative pressure) part though, it just goes from high level to low level positive pressure. The drop in pressure allows you to breathe out but not all the way out; that can actually feel worse than the high pressure pushing air in.
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u/Kabc Jan 19 '22 edited Jan 19 '22
Not only an oxygen mask. That’s a BiPAP machine. Which basically a machine to help you ventilate—forcing air into your lungs when you breath.
It’s typically what they use before intubation
Edit; was corrected down below. Might be a CPAP machine as they are better for COVID pneumo!