(02-18-2015, 04:40 PM)quiescence at last Wrote: ...your 19 is just the average over the entire night. Although mine was 27, during part of the night (while I was on my back) I got a score of 56. 56 times per 60 minutes for about 2-1/2 hours. Your results are different, but I'll bet there are times in the night you were well above that 19 average...
One of the confusing things about AHI is it can be looked at two ways. It is usually reported as the total number of events divided by the number of hours of sleep, but it can also be looked at as the number of events recorded in a particular hour. You may sleep for four hours with an AHI for each of those hours of 4, and another 4 hours with and AHI for each of those 4 hours of 2, but your AHI for the night will then be 3.
Even in a night with an average AHI of 5, for instance, there may be an hour where the number is 3 to 4 times that high, along with hours where the AHI is zero. I had 348 events in ~6 hours in my home study, for an average AHI of 57.7, but now under therapy it is currently averaging 1.74.
So with severe apnea I may have had the brain fog all my life, until xPAP. Since then I feel like I gained about 25 IQ points (for a grand total of 50!). The change was not sudden for me (although never having to get up to pee was indeed a sudden change).
Do you remember the "Girls Gone Wild" guy who became a multimillionaire in his early twenties (and then ended up in jail for bilking his subscribers)? Rumor has it that he would throw wild parties with some of these girls on his private jet and have the crew lower the oxygen TO SPECIFICALLY INDUCE BRAIN FOG!.
You can probably guess why. Having consitently good oxygen sat levels and quality sleep is kinda paramount to not feeling every morning that you pulled an all-nighter. So sleep disturbances like SA definitely can cause brain fog.
I think many here will agree that there are a few things to be recommended here:
1. Follow the forum and educate yourself on the subject and the therapy
2. Use software such as SleepyHead and parse the data (SH will give you aggregate AHI and it will also give you hourly AHI on a graph).
3. Take control of your own therapy (don't expect automatic help from the sleep doc or the DME). Tweaking the therapy myself has allowed me to cut my AHI in half from where it was under the sleep doc's pressure recommendations, for instance.
The therapy works; there are numerous significant benefits, many of them unexpected, and there are virtually no negative side-effects (other than the "mask" look will probably never dominate fashion week). And AHI or RDI will be a hard-data reliable indicator of how well the therapy is working.