I have been using CPAP therapy regularly for about 8 months. Contrary to most newcomers (time taken to get used to it), I was comfortable from Day 1 and got amazing results. I was waking up fresh, alert and daytime lethargy was gone. Even my BP (which was always high in the mornings before therapy) was significantly down (became normal).
However lately (maybe the past month), the effectiveness has reduced by about 50%. Though I don’t think I am snoring (it’s not possible with nasal pillow mask on) have woken up a few times at night with that familiar feeling in my mouth/tongue and not as fresh in the morning as in the first 6-7 months of therapy (and just as I suspected, the BP is also slightly high).
I am very puzzled – there is no indication of any leak, have not touched the settings and more importantly, the readings (which I check every morning) is exactly how it has always been since the beginning of therapy. AHI of around 1.5 and average pressure of around 10.5. My doubts are more technical – how does the machine calculate the AHI, can it be wrong (how can I have 50% of the symptoms of apnea that I was suffering from earlier with a fantastic AHI of 1.5?). Secondly, even though the average pressure indicated is still the same I suspect that it is failing to increase sufficiently when required. That’s based on feelings - in my mouth itself and also the strong air pressure that the machine was generating earlier (especially in when removed in the middle of the night) seems to be missing – now it just seems to be at the same level.
Would be grateful for any insights, suggestions.
Are your using your machine in the auto mode, and what is your pressure range set at compared to your average and 95% readings?
Your AHI is good, but if you downloaded Sleepyhead software, you would see much more data, and then we could get a feel for what is going on.
Yes, I am using in auto mode with setting of low 7.5 (I don't even use ramp feature since its comfortable enough) and high is 20, I think (don't remember clearly since I have never gone to settings myself). I do have the Encore Viewer but confess I have not taken the trouble to upload from the SD card and check. Partly because I already know (from checking every morning) that statistics from all these months will be AHI in the range of 1.2 to 1.8 and average pressure something like 10.5. No "large leak". I am ignorant about anything else that can be analyzed with the data.
But will take your advice and my next step will definitely be to check the data and hope it throws up something that can be easily addressed in setting.
Thanks a lot for your interest and response.