It's the back-sleeping that raises my AHI and increases apneas with the Quattro!
Last night I slept with the Quattro and used my homemade tennis ball belt to prevent back-sleeping. Check out these beautiful results, which is what I'm used to seeing with my nasal/pillows masks! I feel good too -- first time in 5 days I didn't wake up with a headache! Yay!!!
February 6, 2010
AHI...................1.5
AI.....................0.1 (1 apnea)
Leak..................0.00 L/sec
Contrast that with the other three nights that I've slept solely with the Quattro, when some of the time I was probably on my back:
February 2, 2010
AHI...................5.8
AI.....................0.8 (9 apneas)
Leak..................0.14 L/sec
February 3, 2010
AHI...................9.6
AI.....................2.8 (27 apneas)
Leak..................0.12 L/sec
February 5, 2010
AHI...................7.5
AI.....................3.0 (26 apneas)
Leak..................0.06 L/sec
The ResScan charts were posted earlier here for all previous nights with the Quattro. There were large clusters of apneas, apparently associated with sleeping in the supine position during those periods.
I still don't know if the apneas were occurring due to the airway closing because the Quattro bottom straps are very tight (which pulls my chin back) and/or if my chin is closer to my chest while in the supine position. This does appear to be something unique to the Quattro, though, because I've never had more than 3 apneas in a night using my Activa LT nasal or Headrest/Opus 360 nasal pillows masks, even when I sleep on my back some.
I'm learning a lot from this experience, and I hope it'll help others to troubleshoot their therapy challenges too! I've always known that the supine position was a problem for me (and probably most people), as my sleep study revealed. I'm thinking now that occasional back-sleeping may explain some of the variability I've had with the nasal and pillows masks. Makes me wish I had an APAP even more, if for no other reason than to see how much of a pressure difference is needed for me in the supine position! This has also made me appreciate ResScan software even more. Without seeing the results via the software, I wouldn't have known that the apneas were occurring in large clusters. For those of you with suboptimal results, it's worth looking for clusters and trying to figure out
why the apneas occur more at certain times. Could be due to REM sleep, mask (strap) adjustment, sleep position, or airway blockage due to other factors (neck angle, tongue, etc.).
I'll continue the Quattro Experiment for at least a few more nights. Tonight I'll keep things the same and use the tennis ball belt again. I may try the extra-small Quattro after I see the RT on Friday, to see if it fits better, because this size small may be too big for me. Maybe I won't have to wear the bottom straps so tight with that smaller size. We'll see how it goes!
Thanks again, everyone, for helping me with this. I owe you guys!
~ DreamOn