I'm not new to apnea (first diagnosed Feb 2013 with an "at home" sleep study of AHI = 36) and have been using a ResMed S9 Auto CPAP since. When I first started using the cpap I found that I felt way more rested than I had in years and pretty much settled in to using it every night (even when camping.) My AHI's averaged around 4-6 but I often had warnings of high leak rates.
Fast forward 5 or so years and I talked my Dr into writing a prescription for an upgraded machine. After the wranglings with the insurance company I ended up with the ResMed AirSense 10 Auto and the ResMed Airtouch F20 mask. My visit with the DME revealed that I had been experiencing leak rates with the old system of 40-80 l/min nearly all the time, but "not bad" for AHI. She sent a recommendation to my Dr that I get another sleep study to review the possibility of being treated with a Bi level system...This hasn't happened yet. In the mean time, I've started using the new machine.
My first night had a huge leak rate (79 liters/min) but after that I settled in with the F20 and have been getting great numbers with regards to mask fit. My problem has been with the increase in AHI's and the fact that I wake up feeling like I'd been run over by a bus and frankly not truly waking up until after lunch.
Both systems were set at APAP, Min: 5 Max 20. The difference is that the S9 had EPR turned off. The AirSense 10 has EPR On with a setting of 3.
Comparing my old numbers in SleepyHead with my new system numbers I see that with the old one I was in apnea events much longer through the night but not as often. The new machine has nearly 75% more events but I'm in them for a much shorter time.
I'm not an expert and that's why I'm asking here, but my guess is that when the EPR cycles to exhalation I'm dropping down below the point where the pressure can keep my airway open.
Here are some of my screen shots. Thanks in advance for any advise