(06-22-2014, 09:19 AM)BiBob Wrote: Last night I set the s9 at VAuto, IPap @ 25, EPap @ 17 and PS @ 2. My results were AHI = 7.92, H = 1.61, A = 0.29, OA = 5.28, and CA= 0.73. I had one period of time from about midnight to 2am that was excessive but outside that time was OK.
Other than the leakage, these are the best results I have ever had. This result is solely due to the help I have received from all of you on this site. I have a minimum understanding of the relationship between EPap, PS and IPap but am learning from you.
So, we'll see how these results hold up over the next days and from there maybe a Mirage Quattro to work on the leaks.
Was it Leak which was excessive from midnight to 2am?
Regarding the pressure relationships:
PS (Pressure Support) = IPAP - EPAP
IPAP (Inhale pressure) = EPAP + PS
EPAP (exhale pressure) = IPAP - PS
If you meditate diligently on these formulas you will receive illumination and insight.
It is of course too early to draw any conclusions from your experiment of raising the pressures, but since your IPAP had been maxing out, raising the Max IPAP would be expected to lower the number of obstructive events, as more time will likely confirm in your own case.
However, I would suspect even greater improvement, both in the number of obstructive events and in how high the machine will need to raise the pressure to avoid your obstructive events, can be obtained by taking countermeasures against rolling onto your back while asleep.
I wear a teeshirt with a tennis ball in a pocket sewn right between the shoulder blades or a little higher, to make sure that if I roll onto my back I wake up just enough to keep rolling until I have rolled to my other side.
Others prefer to wear a light knapsack with something inside which is light but bulky, for the same purpose.
Still others prefer to sleep in a comfortable reclining sofa chair or in an adjustable bed with the head portion adjusted higher, which, like sleeping only on our side, also reduces the tendency for gravity to worsen our obstructive sleep apnea when sleeping on our back.