Machine/Concentrator:I use a full face mask with my new ASV machine. The doctor has ordered 2L of oxygen to go with the machine. The DME supplied the adapter so the oxygen is delivered as part of the air coming from the machine.
My concentrator produces 90-99% oxygen 1L-5L/min.
Now my intelligence tells me that 2L is standard starting point if you are on a cannula (nose hose).
Now, the full face mask has a vent (during in-hale) that is about 12L per minute. Inspiration time 2seconds volume 400ml. That means 12L/30=400ml +400ml for in-hale = 800ml of 20% air and 2L/30=67ml of 90%. This would then mean that the 90% oxygen is being diluted to 25.4% oxygen.
At 5L/min oxygen: 12L/30=400ml +400ml for in-hale = 800ml of 20% air and 5L/30=167ml of 90%. This would then mean that the 90% oxygen is being diluted to 31.3% oxygen.
What is considered too high or too low or just right for someone that has 50 corrected apneas/hour with a blood oxygen of 87% or lower during apneas.
Consider that I live at 6000ft, the percent of oxygen remains the same, but the amount of molecules because of pressure difference is 25% less as well.
Thank you for your response.