(10-18-2012, 08:02 AM)Clint KY Wrote: I am only 3 weeks into using a BiPAP machine and I am perplexed. I am being awakened after about 3 hours by not being able to get enough air through the mask (an Easy Life nasal). It feels like the machine is throttling back and I have to consciously breathe in to get any air. I thought it was the machine and had it replaced after a week, and last night was the first on my third one and it does the same thing. Even my afternoon naps end up the same. After 2 ½ or 3 hours I am wakened by not getting enough air. Anybody have any insight on this?
What you're describing is the classical symptom of having the lower auto pressure set too low. (Technically called "minimum EPAP" on your machine.)
That's an auto machine. It watches your breathing and adjusts the pressure up when it sees poor breathing and down when you breathe well.
The doctor specifies a range of pressures it's allowed to operate within.
As your sleep stage changes, your pressure needs change. Sometimes you breathe fine on your own and the auto machine lowers the pressure the way it's designed to. Then when you drift into deeper sleep, you start having apnea again. You have to breathe poorly for a while before the machine adjusts back up to the pressure you need.
Once you've gotten used to not having apnea, your mind objects when you start having apnea again when the pressure is too low.
Some doctors seem to think they can just set the pressure to the maximum range and the machine will figure it out. This can cause problems because the machine will start out at too low of a pressure and it takes a while for it to adjust up to the correct pressure. With the PRS1 machine you have, it could be several minutes before it gets to the right pressure.
The next time this happens, don't turn the machine off. Look on the display and see what pressures you're getting. It should show you two pressures, one when you inhale, and a lower number when you exhale.