(11-01-2013, 11:49 PM)Blaifarm Wrote: If I don't get my oxygen through the machine, where does it come from? Serious question.
The machine supplies you with compressed air. The atmosphere contains about 20% oxygen (if I remember back to high school science), so that provides what we need to live. The air coming from the machine is only slightly compressed - it won't inflate your tyres, for instance. But the pressure is high enough to overcome the obstruction in your airway. The trick is to get the pressure high enough to overcome the obstruction, but not so high that it becomes uncomfortable. That's the titration process, which can be done in a sleep lab, or you can monitor your own progress over time and make adjustments to optimise your treatment. (Which is what most people here do).
If the mask leaks, you'll get less pressure into your airway and the therapy will be less effective. But you'll still get more air than just breathing without the machine. You won't be deprived of oxygen. The Resmed machine can cope with a pretty high leak rate, and can adjust the pressure to compensate (up to 24 litres/minute). If the leak rate is higher than that, chances are you'll feel it on your face or in your eyes and wake up anyway. Bottom line is that a leaky mask won't physically hurt you, and a CPAP machine can't deprive you of oxygen.
You mentioned above you have a deviated septum. In that case you might be more comfortable with a full face mask. I have a very slight deviation and tend to get a very stuffy nose, and the full face is much easier to live with for me. I strongly recommend you try out various masks until you get one that you're comfortable with. Talk to your doctors or DME and get them to lend you a couple of different types.
This is a whole new thing for most of us - I'm a relative newby as well - and it does take some getting used to. The lucky people adapt in a few days, I'm on my third month and just about getting there. Everybody is different. The main thing is to realise that sleep apnea is a serious condition with potentially life-threatening consequences. The therapy is not easy, but it's a lot better than the alternative!