Autoset vs CPAP

It may help to set the new machine to manual CPAP at the same pressure of 13 as the old machine. Use it that way for a few nights and then go to APAP mode at something close to 13, such as 12-14. Then start increasing the range a bit if you want to go with APAP mode.

If you need 13 most of the time, you'll probably feel air starved if you start out each night at 4.

palerider wrote:

Wulfman... wrote:It takes 10 seconds to "define" an apnea as such (or a hypopnea). Without preceding events, that's a pretty short time and if it's a singular event, it will occur without a response.

When you find the documentation, I'll be glad to read it. I realize some of the technology has changed over the years, but I'm skeptical about them addressing apneas without preceding events.

By the way, I'm only talking about responses to apneas and not hypopneas. It all depends on the "shape" of the airflow to the sensors and algorithms.

well, that didn't take as much digging as I figured it would.

http://www.resmed.com/int/clinicians/co ... nc=dealers
for the older s8: http://www.resmed.com/assets/documents/ ... ow_eng.pdf

There aren't many of them around anymore.

But.....it still didn't prevent the "frank" apneas, nor will it attempt to address one in progress and with the old "A10" algorithm, it was VERY particular about the events it would try to address over the pressure of 10 cm. (in case they were Centrals)


Den

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How does a ResMed AutoSet device respond to apnea?

Typically prevents apneas, by treating flow limitation and snore. These usually act as early signals for more severe apneic events
In the event of a sudden apnea that occurs without any preceding flow limitation or snore, AutoSet Spirit increases the pressure after the apnea has ceased to prevent further apneic events
Pressure response is based on the duration of the apnea
If no further events occur, AutoSet Spirit gently decreases the pressure, towards the minimum set pressure

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Wulfman... wrote: There aren't many of them around anymore.

But.....it still didn't prevent the "frank" apneas, nor will it attempt to address one in progress and with the old "A10" algorithm, it was VERY particular about the events it would try to address over the pressure of 10 cm. (in case they were Centrals)

there aren't many s8 machines around, and, yes, the second post was about the s8, the first post was about the s9. the point being, even the s8's responded to apneas, though with the a10 assumption, they didn't respond to apneas over 10cm, the s9's, being able to tell the difference in central and obstructive, do respond to apneas over 10cm.

the machines don't respond to any apnea, frank, george, fred or other *grin* until after it's over, never said they did. but they DO respond to apneas, whereas what you keep implying is that they don't respond to apneas, at all.

there's not much a machine can do once an apnea starts, but it does increase the pressure afterwards to try and keep the next one from happening.

palerider wrote:

Wulfman... wrote: There aren't many of them around anymore.

But.....it still didn't prevent the "frank" apneas, nor will it attempt to address one in progress and with the old "A10" algorithm, it was VERY particular about the events it would try to address over the pressure of 10 cm. (in case they were Centrals)

there aren't many s8 machines around, and, yes, the second post was about the s8, the first post was about the s9. the point being, even the s8's responded to apneas, though with the a10 assumption, they didn't respond to apneas over 10cm, the s9's, being able to tell the difference in central and obstructive, do respond to apneas over 10cm.

the machines don't respond to any apnea, frank, george, fred or other *grin* until after it's over, never said they did. but they DO respond to apneas, whereas what you keep implying is that they don't respond to apneas, at all.

there's not much a machine can do once an apnea starts, but it does increase the pressure afterwards to try and keep the next one from happening.

Right. It has to wait 10 seconds to decide if it fulfills the description of "apnea".......and then that apnea gets counted.
And, lots of things depend on the circumstances of whatever events take place.
It's just that there seems to have always been a misunderstanding by quite a few folks that APAPs go after apneas.......and then the users wonder why their AHI is so high.......especially with a wider pressure range. They change pressures slowly.

These machines and their algorithms are essentially computers with programs.......if this, then this, or this, else do something else. It would be interesting to see the flow charting of the various algorithms.


Den

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Wulfman... wrote:

palerider wrote:there's not much a machine can do once an apnea starts, but it does increase the pressure afterwards to try and keep the next one from happening.

Right. It has to wait 10 seconds to decide if it fulfills the description of "apnea".......and then that apnea gets counted.
And, lots of things depend on the circumstances of whatever events take place.
It's just that there seems to have always been a misunderstanding by quite a few folks that APAPs go after apneas.......and then the users wonder why their AHI is so high.......especially with a wider pressure range. They change pressures slowly.

These machines and their algorithms are essentially computers with programs.......if this, then this, or this, else do something else. It would be interesting to see the flow charting of the various algorithms.

my point, such as it is, is that the autoset (and in some manner) the prs1 DO respond to obstructive apneas, not during, but after the fact, so they will cause pressure to go up to try and prevent future apneas. as you've said, they react pre-emptively when they see snores and flow limits. of course, the closer you re to the needed pressure in the first place, the better.

I'd love to see that flowchart too