My first question is this – is Clear Airway Apnea just another term for Central Apnea? I don’t see anyone except Respironics using the Clear Airway Apnea terminology, even with a Google search. I like the fact that this machine claims to be able to distinguish CA’s from OA’s, which is something that my old Resmed Autoset II didn’t do. They say that they don’t make any change to the pressure due to CA’s, but they do report them and they are included in the AHI.
I have been varying various factors, including the “flex” settings (A-Flex, C-Flex, and no Flex) and the pressure limits (slightly). I have also been trying both my Ultra Mirage nasal mask and my Ultra Mirage II full face mask. The preliminary data seems to show that my OA index is more or less the same under any scenario (about 0.5 on average), my H index is about the same also (about 1.7 on average), but my CA index is higher with the full face mask (about 2.3 rather than about 0.5 for the nasal mask.
My second question is this – is this significant? Does it matter? To look at it more broadly, my AHI is about 2.5 with the nasal mask and about 5 with the full face mask. I plan to continue to collect data, to separate all the various variables, but can anyone give me any insight about this seeming difference between the full face mask and the nasal mask? Is there some reason that the full face mask should cause more CA’s, or is it likely just the effect of how the machine distinguishes a CA (by sending out several puffs of air when it detects an apnea)? Even if it is the latter, the AHI is still almost twice as high with the full face mask, so it makes me wonder. I have nasal issues, and the full face mask is more comfortable for me, but I don’t want to compromise my therapy if it matters.
This might sound like a very picky, technical question, but I have noticed that there are some very knowledgeable people here, and I thought I would see if I could gain some insight.
Before anyone asks, I don’t have the Encore Pro 2 software yet, but my sleep doctor’s office is very cooperative and less than five minutes away. They will gladly print me out my data every week at no charge, so I have been getting the information that way.
|Machine: PR System One REMstar Auto CPAP Machine with A-Flex|
|Mask: Ultra Mirage™ II Nasal CPAP Mask with Headgear|
|Humidifier: PR System One Heated Humidifier|