Quote:
Originally Posted by xelasnave
...like if you had a heart attack it may save calling the ambulance...
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No, always call an ambulance. It doesn't matter how oxygen-rich the atmosphere is if your heart is not beating!
Anyhow, there are a few brands. My father had one in his terminal decline. It worked, but was a bit noisy. His was on loan/rent - I can't remember the fees. He used bottled oxygen attached to his wheelchair when I needed to take him somewhere.
These machines use room air, but concentrate the oxygen - the setting is variable - to provide enriched oxygenated air to the patient.
Dad used to complain that the face mask (a fairly simple design) was uncomfortable and would slide it off when he was tired. If you get one for your brother-in-law, see if there are more comfortable face masks around.