1) The S9 AutoSet does a better job of finding the right pressure and treatment in general than the S8.
2) The S9 scores fewer apneas vs. the S8 for many people due to changes in the detection algorithms. There are some things that fall in the "gray area." I don't think this is "marketing," and that the newer algorithm is more in line with what the medical professionals think in terms of scoring apneas.
Even if everything is "right," there's still some "judgment" in apnea diagnosis and treatment. Sometimes, one thing works better than another, and you have no real explanation why.
If your AutoSet ever starts showing 0 AHI night after night, unplug the power for a few minutes. A number of people have reported their machines getting "confused" and needing a reboot. Unplug the power, don't just turn it off. It doesn't seem to affect treatment, just data recording. Also, it's a "stuck on 0.0" problem, not a "record low values" problem.
Get the free SleepyHead software here
for information on the main alternative to CPAP.
If it's midnight and a DME tells you it's dark outside, go and check it yourself.
Another point is to not be automatically afraid of what seem to be high AHI values. From personal experience, if I have my CPAP on but am futzing with my pillows or something, I will often end up periodically (consciously) holding my breath for long enough to register as an obstructive apnea. Look at your collected data. If all (most) of the apnea events are right at the start or end of a session, they will contribute to the overall AHI for the session, but aren't really "real". Look at what is happening while you are asleep to see if there really is a problem.
This is why most people tell you to run away from "brick" (non data-logging) machines. Just the summary can be misleading.
S9 AutoSet nuke apnea events before occurring as it respond to snoring and flow limitation which are precursors to apnea events. Also differentiate between obstructive and central apnea through FOT, take no action if open airways is detected but deal with it if closed airways is detected. For this reason the S9 enhanced algorithm is more efficient than its predecessors
06-16-2013, 09:14 PM
Thanks a lot to all for the input!
As I said, my main concern was that for 7 years on 3 other machines (REMstar Auto and two S8 Vantage) I was hovering around AHI 5. So I was looking for a possible explanation about why that much difference with S9.
I think, like Archangel pointed, S9 does both:
1. Does better job with different algorithm
2. Interprets data differently.
I did check SleepyHead reports – everything looks good. I do feel that S9 has better Auto mode. Other machines were going to Max pressure often and that woke me up. So I used most of the time CPAP mode.
S9 seems has very nice Auto algorithm and applying Max pressure more intelligently (not as often).
06-17-2013, 12:48 PM
(This post was last modified: 06-17-2013, 12:50 PM by britincanada.)
Congrats for the Low AHI
We all aim for below 5
But the Main thing is How are you Feeling if you Feel great with a AHI of Say 3
Does worrying about getting it any lower really help
If its not broke don't Fix it