What model Dreamstation did you get? You're using fixed pressure, so the machine is currently using a pressure of 11.0 cm to stent the airway, and does not make any changes to that pressure in response to apnea/hypopnea or other indicators.
Thank you very much for your response. I had no idea that I was still having or that it was normal to still have A/H when using a CPAP. In 2009 I was diagnosed with Severe OSA. I've been using a system with no data set at 11cmH20 since the summer of 2009 religiously and I still get a bit tired some days but nothing like pre CPAP. I just got the DreamStation and averaged between 4.x and 9.x AHI over the last 4 nights. Prior to last night I set the C-Check mode and notice that the DreamMapper software on my phone says usage was 8.0 to 14.0 so perhaps the baseline needs to be higher than 11.0.
Thank you for your response. I have the DreamStation CPAP Pro. Looks like the Auto CPAP may have been a better choice.
Thank you very much for the information.