I've been using a BiPAP AutoSV since August 2009. I've been on supplemental O2 at 3 liters since November 2009. All this was based on a take-home sleep study and one night using a pulse oximeter.
I had a full polysomnogram on January 18, 2010. On January 25, I had a full night titration. Based on the numbers I see from those two reports, I question if I still need the supplemental O2.
Here is some data from the Sleep study on 1-18.


As you can see, my desats were numerous and moderately serious. Not to mention an AHI of 84.6! But, this is a snapshot of me basically untreated. Although I had been given the BiPAP AutoSV, I had never been titrated to find the pressures that resolved my apneas/hypopneas. My sleep Dr. had set my pressures on my prescription at 20/5/5 with Auto as the Backup rate. But, no titration, so he never knew what this would do for my situation. He never followed up.
Here is similar data from my Titration study of 1-25-10.


My titration study recommended pressures of 14/6/6 with a Backup rate of Auto. At these pressures my AHI was in the range of 3, and most of my desaturations were resolved.
I'm planning to try my pulse oximeter at night to see what kind of desats I'm having now, but would appreciate feedback from those more knowledgeable than me.
If I can drop the O2 supplementation, travel would be possible again. Right now, it is a forbidding prospect. The O2 concentrator is the size of R2D2, sounds like a diesel truck, and heats our bathroom quite nicely during the winter. It weighs maybe 48 pounds. Imagine having one of these in a motel room!
Looking forward to some profound responses, maybe a visit from Muffy, SWS, and who knows?
Happy Naps,
Mr Capers