This therapy is increasingly available throughout Europe . It is given to increase oxygen transfer to the blood using a nasal canular or mask. Air and oxygen mix as you breath air in ,thus passing air with a higher % of oxygen to the lungs.
There are two reasons for the therapy, the first is oxygen taken at a flow rate of say 3 l/m for 15 hours per 24 hour day. This is to maintain healthy body cells, without sufficient oxygen body cells will waste away. Of all the cells in your body the only ones that do not need oxygen from your blood are the cornea eye cells, they take oxygen from the atmosphere. The other therapy is ambulatory oxygen. When you are active, doing something, eg, walking , your damaged lungs will not transfer sufficient oxygen to your blood, the % oxygen saturated in your blood will go down and you will become breathless. This is your body calling for more oxygen and making you breath more rapidly to supply .This is where the ambulatory oxygen is needed, to supply air with a higher concentration of oxgen to your lungs .
From rest to activity the demand for oxygen transfer to blood can rise 25 to 50 times . Even talking and eating increases oxygen demand.