riverdreamer wrote:OK, the UBB code is too complicated with multiple layers of quotes to keep up with individual points.
However, everything I posted is what Resmed has up on their site currently, regarding the Autoset II.
So is this:
http://www.resmed.com/en-us/patients/tr ... u=products
How do AutoSet devices know to adjust pressure?
After you fall asleep and your pressure needs begin to vary, your AutoSet device responds to three separate parameters: inspiratory flow limitation, snore, and apnea. AutoSet devices act pre-emptively by increasing pressure in response to inspiratory flow limitation and snore, both of which typically precede obstructive apneas. The AutoSet device calculates the pressure you need based on the severity of the event. This early intervention prevents obstructive apneas and reduces respiratory arousals.
How do the AutoSet devices handle hypopnea events?
AutoSet devices respond to obstructive hypopnea events when they are associated with flow limitation or snoring. Hypopneas that are central in origin (related to your central nervous system, not physical obstruction) should not be treated with increased pressure.
In addition, I have a Resmed Autoset machine, and it does respond to hypopneas. Unless we want to say the software is not correct, in which case all bets are off. My sleep study claimed all of my hypopneas were obstuctive, which is the opposite of what the expert you quote above claims. [/quote]
The man who designed the machine designed it not to respone to hypopneas. The autoset algorithm has not changed. It responds
only to flow limitations, snores and apneas. The designer may have been wrong in his assumptions, but that's the way the machine's algorithm still works.
I may be wrong about that, but, as far as I know, ResMed's software does not ever show you the flow limitations or snores it responds to, unless you use the Reslink module.
As to whether I have a misconception about how long it takes to respond, the Resmed raises the pressure in response to flow limitation, which occurs before the apnea, so it CAN respond to prevent the apnea.
No argument about that - Auto attempt to prevent events, to preempt event, and to raise pressure after an even has been identified.
But it only raises the pressure in a set pattern, .2 every so many seconds, so if the apnea only lasts 10 seconds, then it may not respond quickly enough to prevent that particular apnea, or at least to prevent it completely. It may shorten the span. I'm sorry, I don't have the quote, and I think at this point it is better to read entire pages of information, rather than quotes out of context. I do see patterns on my data that completely support this. I don't know as much about how the Respironics work, but that is how the Resmed does. There is plenty to read on the Resmed site, some of it older, some more current.
Reading articles and patents is a great way of learning how the machines work, and I did suggest you read the full article I quoted from. I also gave you the link to the article.
This is what you reported about your therapy on another thread:
viewtopic.php?f=1&t=40009&p=350154#p350154 (the full text is there)
I started out with the recommended auto pressure of 4-15, but quickly found that was not doing it. I was having higher AHI than during my study, including much higher AI, and I figured it just wasn’t moving fast enough to correct the apneas. I moved the lower setting up to 7, where I was titrated. Over the last month, I have bumped it up to 8.4, watching how things go. For a couple of weeks, I have had lung issues after a chemical exposure that caused serious inflammation in my lungs and sinuses. I am thinking that made things worse, but it is also a common experience for me, at least at lower levels, as I am very sensitive to inhaled chemicals and fragrances. So I can expect to have periods of respiratory tract inflammation.
You alse added that your 95th percentile is at a pressure of 9.
Therefore, your statements about what you see in your own software, if it refers to the way your machine behaves at a prerssure above 10, is based on the 5% of the time that your machine is above 10. There is a less than 5% chance for you to see your machine applying the A10 algrorithm.
Whether or not this is the best machine for Protageegal, I can't say, but I think without more data, nobody can.
True. Nobody can say whether or not the ResMed is the best machine for Portageegal, withuot more data.
Speaking of interpretations: When my brother was a kid, he misinterpreted the speed of a scooter, and the scooter hit him. My dad picked him up, put him in the car and took him to the hospital (my brother had two bad cuts). My brother's inteprataion was
wrong.
So was the interpretation of my classmate and neighbor who came to school late and told me my dad had run over a child, and then put him it his car to take care of him (my dad is a doctor).
Not all interetations are equally valid. Therapy has to based on
valid interpretation of reality. The more facts we gather, the better chance we have of finding interetations that fit reality.
O.