06-21-2012, 10:45 AM
(This post was last modified: 06-21-2012, 10:54 AM by BabyDoc.)
My AHI as reported by the S9 seems to range from 2 or less to over 8. No two nights have been the same in the 3 weeks I've been using the S9 Autoset.
Almost all the events reported are centrals so how to resolve this? I'm told the S9 Autoset does not respond when it detects centrals and that the S9 Adapt does. I have requested an exchange to the Adapt, waiting for an answer now.
If you weren't having a lot of central apneas when you had your sleep study, chances are the central apneas that you are seeing now occur because the pressures may be set too high for you on your Autoset. I would talk to your sleep doctor about adjusting your pressure range, before asking for an S9 Adapt. The S9 Adapt is meant for people who have true central apneas or complex sleep apnea.
Oh, another thing. Look to see when those centrals occur. If they occur while you are awake, they are probably meaningless. I found that to be true when my lower pressure was a bit too high. I would turn on the machine and while getting accustomed to the new work of breathing against this pressure, begin to hyperventillate a bit, then pause with my breathing in order to rest. During those pauses, the Autoset would record a central. I eventually lowered that starting pressure to a more comfortable level and the centrals disappeared. Another fix for these awake centrals would be to ramp up your machines starting pressure from a lower pressure for the period it takes you to fall asleep.
The other thing you can look at is the length of the CA's. The longer they last, the more harmful they can be.
What is your average AHI?
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Not sure if it was already mentioned. My internal SD cardreader was not accepted by rescan. But with an external one the data transfer worked just fine.
Do a search on the ResMed website and somewhere you should find out how they determine if your issue is a central or an obstructive event. The algorithm is not, by any means, perfect. It depends on taking all of the other data gathered, examining it and plopping it into the algorithm to determine if the issue is perhaps a central. Then, as I recall, it weighs out the probabilities and takes its best guess. I think it goes something like this........ no minute airflow + no obstruction + no leakage = central; vs. no minute airflow + apparent obstruction that does not react to increased airway pressure, etc. = obstructive apnea event. Examine ALL of your data at hand from the S9 and it should become apparent why it is guessing as it does. When they do a proper sleep study (at least in these parts) they do an EEG at the same time, monitor eyelid movement, etc., to get a better idea of whether or not you are having centrals.
IMHO centrals are important as positive airway pressure is not going to do a heck of a lot to assist you and they require other medical intervention. Not sure if there are drugs out there to assist but I DO KNOW that there are drugs out there that will grossly exacerbate the centrals problem.
It is an issue that demands investigation; and you may have to take your own data to the sleep doc or neurologist to get the ball rolling. In these parts that requires a referal from your family doctor.... show him the data and he won't have a clue as to what it all means but is likely to write up the referal, which is mandatory for seeing the specialists.
Centrals are no more or less damaging that an obstructive event - both demand attention and treatment. Centrals are generally not going to be corrected by positive airway pressure at CPAP levels. It may require BIPAP (in essence a ventilator) that will blow air in and suck it back out. I am saying BIPAP.... it may actually be more along the lines of a ventilator that is needed. No biggie. Unless you fail to pay attention to it.
Educate, Advocate, Contemplate.
Herein lies personal opinion, no professional advice, which ALL are well advised to seek.
Let me first start by apologizing if the answer is already of the forum and I didn't find it.
I downloaded the software and installed the drivers. I then read the instructions saying not to download the drivers. So i went to add/remove programs and deleted the files including the ResScan program.
I've reinstalled the program however I can't get it to read the SD Card. I'm using a universal 15 in 1 memory card reader. No matter what I try it won't read the card.
When I launch the program I get an error, but if I click on "ignore" the program seems to start normally.
Has anyone else had the same problems?