(07-21-2015, 11:11 PM)Stbrnd Wrote: I have read the other threads that have people using the same device as me with more of the part where the discussion could be about something other than why I got this machine. Sorry that my explanation does not qualify me to ask questions here. I will figure it out as I did my diagnosis to begin with, on my own.
Thanks for the site and the secondary info I can glean as a reader only.
Stbnrd, the reason people are interested in your machine and diagnosis is that the VPAP Adapt is designed to treat a specific set of symptoms, not ordinary obstructive apnea. In particular, it's designed for central apnea and Cheyne-Stokes respiration. If this is your condition it requires different advice compared with obstructive apnea. If your diagnosis includes central apnea and/or CSR, please tell us so that we can advise accordingly. If it's obstructive apnea, again let us know.
You might already be familiar with the following, but I'll spell out for you and anybody else who might benefit.
The VPAP Adapt has three modes: CPAP (constant fixed pressure), ASV and ASVAuto. In both ASV modes, the three key parameters are exhalation pressure (EPAP), inhalation pressure (IPAP) and pressure support (PS). IPAP = EPAP + PS
The EPAP is either pre-selected (ASV) or automatically adjusted (ASVAuto) to control obstructive apnea. Then, on every
inhalation the pressure is increased by an amount termed pressure support (PS) to give IPAP. The PS will automatically vary between preset limits (PSMin to PSMax) to control central apnea or CSR. The machine learns and matches your breathing pattern, so that if you pause in your breathing, it will continue to provide pressure support at the same frequency. If you stop altogether, it will instantly jack up the PS to keep you ventilated and stimulate spontaneous breathing. In this way the Adapt is not just a high end machine, it's actually quite a different type of machine, with a very different "feel" from ordinary xPAP machines.
Your settings will give you an EPAP between 4 and 9.4 cm H2O to control obstructive apnea. This is quite a long way below your Rx pressure. On every intake, the machine will boost this by between 5 and 10 cm H2O. You say that these settings are comfortable and your AHI is 0.5 - that's an excellent outcome. Frankly I'm surprised, but I know the Adapt to be a remarkable machine so perhaps I shouldn't be.
The other problem is the leak. This is measured in litres/minute and should stay below 24. Above that, the machine no longer has full control of the therapy (and the leaks will wake you up anyhow). Sleepyhead will report your minimum, median, 95 percentile and maximum leaks. It would be instructive to see what each of these is. You can pretty much ignore the maximum as that might just be a transient, but the 95% should be below 24 and the median should be well below.
I trust this has answered some of your questions, and also explained the interest in your particular machine. It doesn't disqualify you from asking questions, but it does raise a few questions of its own.