Lets say you walk into a room and a patient is on a non-rebreather mask, the bag is inflated, but the patient is hooked up to an O2 concentrator that only goes up to 5 Liters and it is on 5 liters.
When I saw this I switched the patient to a nasal cannula, family agreed this would be much more comfortable and patient can talk better and blow her nose better etc. She is a hospice patient.
So she had been on the non-rebreather set up all night like this with the 5 liter set up. Patient is dying, has heart disease and MRSA.