New M Series Auto also auto change rate

[Guardian]

Hi.
I'm considering an apap for my sister. Does anyone have the new M series auto yet? If so, how does it seem to get the job done? Does it have a ramp feature in auto mode?
Also can someone explain how fast is the rate of pressure change in an auto machine.
For instance if she's using 4 cm on her side and rolls onto her back, how long would it take an auto to change to say 8 cm, which is her lab titrated pressure? Would it take an equal amount of time to switch bact to 4 cm if she turned again?
I wish I had caught the link to that respironics algorithm video, but I missed it too.
Also when you first start the auto does it start at the lowest set pressure or at the last auto-titrated pressure it was using when you turned it off.
Thanks for the advice.
Tom

[Goofproof]

When they make one and sell it, we will have to get the answers, Right now they aren't in the loop, when they are cpap.com will carry them.

[Guest]

Hi.
I'm considering an apap for my sister. Does anyone have the new M series auto yet? If so, how does it seem to get the job done? Does it have a ramp feature in auto mode?
Also can someone explain how fast is the rate of pressure change in an auto machine.
For instance if she's using 4 cm on her side and rolls onto her back, how long would it take an auto to change to say 8 cm, which is her lab titrated pressure? Would it take an equal amount of time to switch bact to 4 cm if she turned again?
I wish I had caught the link to that respironics algorithm video, but I missed it too.
Also when you first start the auto does it start at the lowest set pressure or at the last auto-titrated pressure it was using when you turned it off.
Thanks for the advice.
Tom

Autopap's don't have a Ramp in automode, there is NO need for it. With an autopap you have a LOW pressure and a HIGH pressure setting. The low pressure is whatever you can tolerate to fall asleep. The machine will run at the low pressure (can be 4cm like you reference). When the machine detects a SDB event it increases pressure to address the event then settles back down to the low pressure setting. If you want to "limit" the pressure the machine delivers you change the default limit from 20cm to a lower setting say 15cm if that was your titrated pressure.

Autopap's are autotitrating meaning they automatically find your ideal pressure needed to cover all your sleep disorder breathing events.

So with an autopap, you turn on the machine it starts out at that low pressure setting, by default they come set from the factory at 4cm. Again most people find they starve for air at that low pressure so most increase it to 5cm , 6cm or even higher. If the last titration study showed your sister needed 15cm, then you would set the high pressure setting a couple cm's above that to allow the machine to increase if needed. So the range in this example would be 5cm to 17cm.

Buy your autopap from cpap.com and it will come with the manual to instruct on how to change pressures (very easy to do).

[DME_Guy]

The algorithm won't change from the current Remstar Auto, just the box. The Remstar Auto algorithm will raise pressure based on limited flow, snores, and of course hypopnea and apneas. It's not easy to answer your question because it's measuring more than just apneas and hypopneas.

When it come to just apneas and hypopneas, it will raise the pressure by 1 when it detects two events.

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CPAPopedia Keywords Contained In This Post (Click For Definition): Hypopnea, auto

[Guardian]

OK, thanks for the help.
Can the auto machine also detect *and* record central apneas?

[GoofyUT]

Well, the way that I understand it is:

For Respironics, they use a "testing" algorithm which periodically raises the pressure to see if there is any improvement in flow rate and shape. The algorithm will raise pressure to a certain point and then, if it detects no improvement despite what it believes is a degradation of flow rate and shape, it'll decide that a "non-responsive apnea" is occuring, and it will then back the pressure down, since increases in pressure can make centrals worse. It will record this event as a non-responsive, and Encore will report data about the occurence in the category of "non-responsives."

I don't believe that ResMed approaches centrals in this way. I know that the S8 doesn't report data on centrals on its LCD screen, and I don't have ResMed AutoScan software, so I couldn't tell you whether ResMed software detects and reports centrals. Same for Puritan-Bennett and Invacare.

Hope this helps!

Chuck

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CPAPopedia Keywords Contained In This Post (Click For Definition): respironics, resmed

[Guardian]

Thanks Chuck,
Yes it does help. At least I'll have those numbers to show the doc. Seems to me that over time it would make a difference in determining whether or not she needed another study done and whether or not bipap therapy could be considered. And I'll know the pressures won't go too high for her.
Tom

[DME_Guy]

The S8 Vantage doesn't respond to apneas, obstructive or central. It waits until the event passes and then raises pressure. There reasoning is that raising pressure during an obstructive apnea event will cause arousal and if it is a central, it will make the centrap apneas worse.

I don't believe that ResMed approaches centrals in this way. I know that the S8 doesn't report data on centrals on its LCD screen, and I don't have ResMed AutoScan software, so I couldn't tell you whether ResMed software detects and reports centrals. Same for Puritan-Bennett and Invacare.

Hope this helps!

Chuck

[pop]

Tried the "new" m series with cflex and my pressure is at 14. My wife looked at me and stated that will not be staying in the same room. It was so loud, even when I turned off the CFLEX option. The air intake on this machine is a quarter of the size of the older model so I suspect that is the reason. I was lucky my supplier still had the older model REMstar Plus with C-Flex, what a great machine, although larger than the new M series it is so QUIET eveb at 14 pressure.