BiPAP/VPAP vs APAP with EPR

ozij wrote:

Jayjonbeach wrote: Am I right in assuming that the VPAP Auto 25 will do everything that a S9 Autoset will?

No.
The VPAP Auto 25 does not use the enhanced algoritm which the S9 has. You may find it raising pressure in response to open airway apneas - somthing it should not do. You may also find it does not raise pressure in response to obstructive apneas at pressure higher than 10. Much depends on your breathing pattern. Furthermore, on its own, it also does not have the data recording/reporting capabilities of the S9 - IIRC, you need a Reslink module (nla) to get the full details of your breathing from a VPAP Auto 25.

Interesting, seems to disagree with what is on the Resmed website:

VAuto mode uses AutoSet technology to automatically adjust to a patient’s pressure needs as they vary throughout the night. With ResMed’s clinically proven AutoSet algorithm, VPAP Auto 25 is able to detect flow limitation and act preemptively to prevent apneic and snoring events.

That is word for word from the VPAP Auto 25 Fact sheet. It is also basically what the S9 claims to do. I imagine the S9 "algorithm" is "new and improved", though I have found NOTHING to support this. It might_actually_be_the_same. I do think the S9 Autoset has a newer algorithm than the S8, but am not sure about it having a newer one than the VPAP Auto 25.

Jayjonbeach wrote:

ozij wrote:

Jayjonbeach wrote: Am I right in assuming that the VPAP Auto 25 will do everything that a S9 Autoset will?

No.
The VPAP Auto 25 does not use the enhanced algorithm which the S9 has. You may find it raising pressure in response to open airway apneas - something it should not do. You may also find it does not raise pressure in response to obstructive apneas at pressure higher than 10. Much depends on your breathing pattern. Furthermore, on its own, it also does not have the data recording/reporting capabilities of the S9 - IIRC, you need a Reslink module (nla) to get the full details of your breathing from a VPAP Auto 25.

Interesting, seems to disagree with what is on the Resmed website:

VAuto mode uses AutoSet technology to automatically adjust to a patient’s pressure needs as they vary throughout the night. With ResMed’s clinically proven AutoSet algorithm, VPAP Auto 25 is able to detect flow limitation and act preemptively to prevent apneic and snoring events.

That is word for word from the VPAP Auto 25 Fact sheet. It is also basically what the S9 claims to do. I imagine the S9 "algorithm" is "new and improved", though I have found NOTHING support this. It might_actually_be_the_same.

You must have missed this: viewtopic/t58737/Resmeds-Central-Sleep- ... ation.html

For your very own benefit, here's the link to the above mentioned ResMed publication from ResMed's site.

http://www.resmed.com/us/assets/documen ... -paper.pdf

There is Autoset, and there is "Enhanced Autoset". Enhanced Autoset was first put into use in 2009 in the S9 series .

Enhanced Autoset is not used in the VPAP25.

Thank you very much, a very interesting document that is.

Unfortunately not dated, but at the beginning and in the Conclusion it does specifically point out the S9 Auto as the one having the "enhanced" algorithm, which has a few enhancements too not just Central detection:

The algorithm has not changed for 10 years, but has recently been enhanced to increase sensitivity to flow limitation, decrease reliance on snore and introduce central sleep apnea detection (CSAD).

And if anyone is wondering just how much better the "enhanced" algorithm is, here is one LARGE benefit:

If the apnea, however, is central an increase in pressure is inappropriate and may increase the chance of further central apneas.This may potentially lead to the device “running away” with progressive increases in pressure causing increasing
numbers of central apneas. To prevent this from occurring the previous AutoSet algorithm would not increase pressure
in response to apneas beyond 10 cm H2O. While this prevents the device from “running away” it is not ideal as
obstructive apneas above 10 cm H2O are not responded to and central apneas occurring at pressures less than 10 cm
H2O cause inappropriate increases in pressure.

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With this confirmed, it makes the decision on buying S9 Auto versus VPAP Auto even harder. Once they come out with a new VPAP (which I know lots of people have been waiting for) then that would be the top dog but for now, do I go with the newer tech or the machine that still has Auto and gives you maximum exhale relief....