(05-16-2015, 06:41 PM)TyroneShoes Wrote: The reason lots of use the S9 is because it has been the de facto choice of many professionals for a long time. Fewer use the Airsense, but not because the Autoset is better, but because the newer machine is not as well distributed yet. If you are getting in the game now, I would go for the newest machine you can get. The older Resmeds don't measure RDI, which is something some folks may find important.
As far as I know the only ResMed machine which reports RERA events and therefore provides the data needed to calculate RDI is the A10 Autoset For Her.
The data-capable Philips Respironics System One machines measure RERA events and so will allow calculation of RDI.
No RERA events were reported during your sleep test. When a sleep test reports all zero data there is a slight possibility that RERAs may have been present but were not looked for and therefore were not reported. But I think it is more likely that you had no RERA events.
If you have shallow breathing and look forward to a machine which will help you breathe more deeply the type of machine which does that is called a bi-level machine. The greater the pressure difference between EPAP and IPAP (called Pressure Support) the more easily and deeply we will breathe.
A Pressure Support setting of 10 (cmH2O) will usually be adequate to do all the work of breathing. A setting of 5 strongly supports breathing more deeply.
An APAP machine like the AutoSet has Exhalation Pressure Relief, which is like a form of Pressure Support except limited to 3 cmH2O.
On standard ResMed CPAP/APAP machines EPAP = IPAP minus EPR, and on standard bi-level machines IPAP = EPAP plus PS, but these machines will wait for us to start a breath before changing the pressure from EPAP to IPAP.
An ASV machine, however, will step in after a few seconds and will start automatically cycling between IPAP and EPAP in order to do for us some or all of the work of breathing.