Differences between a v/Bipap and S9

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I don't feel qualified to answer your questions, but here is a link to discussions on Central Apneas:

viewtopic.php?p=22702

This is also an useful link, to the S9 Data Management Guide:

http://www.resmed.com/uk/assets/documen ... ow_eng.pdf

I see on your profile that you have an oximeter. Have you been using it, and do you see a correlation between periods of desaturation with central apneas?

The EPR setting will give 1-3 cm H2O of exhale relief. My understanding is that EPR is suspended if the Autoset measures flow limitation, snore or obstructive apneas, so it doesn't work exactly like a Bi-pap.

You mentioned that you think you are mouth breathing because of "ramping up". Are you also seeing period of high leaks that correlate to this?

I hope others will respond to your question. There have been some recent threads on Bi-Pap and they might also be helpful.

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Max250 wrote:Thanks Katie, you have been a great help lately - apologies for asking so many questions all at once!
Havent received the oximeter from China yet - its just cleared customs in Oz.

EPR from Resmed website "And to ensure comfort without compromising
therapy, EPR is automatically suspended during
apnea events and re-starts when breathing
resumes."
So I reckon you are right on that.

Cant tell what is going on here - this was my best night so far, slept right through more or less. Seemed to have either woken up or started mouth breathing when pressure was high. One big leak associated with a ramp. Does this suggest what might be going on to you? thanks

To me it looks like the pressure increases are in direct relation to flow limitations which (if I understand the autoset) is exactly what it is supposed to do in order to prevent obstructive apneas. Can you post an image on a night with more centrals? On this night you only had one and it doesn't seem to correlate to any leaks. Your leak rate looks pretty good to me. The only large leaks I see look like they are associated with breaks in flow data indicating that they are probably the result of moving your mask around.

It is possible to have pressure induced centrals if you have complex apnea but based on that one night your data looks pretty darn good to me. In fact I wish mine looked that good. If you are having a lot of arousals throughout the night it is possible that the centrals are related to sleep phase changes rather then pressure changes. I would expect that if you had pressure induced centrals you would see the number of them increase as your pressure increases but on this night that did not happen.

I'm sure someone who knows a lot more then I do will be along to help but it might help to post a night when you had a lot of centrals in order to take a look what is really going on.

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Max, here's how to post an image in your post to the forum:

I'm using Windows Vista. Using snipping tool, outline the graph, and save as a jpg. Then open in Photoshop, crop to 8 inches wide, and save. Open a free account at Photobucket.com, and upload image. Then copy the [img] code, and paste into your post.

Click on Preview to make sure the image is posting correctly. If it looks good, hit Submit.

DreamDiver made this excellent presentation on how to do it:

http://www.montfordhouse.com/cpap/how_to_post_images/

Max250 wrote:

oscar98 wrote: Can you post an image on a night with more centrals? On this night you only had one.[quote="oscar98"

apologies the key isnt visible, that's 10 centrals, 1 hypopnea and no obstructives


The breaks look as if they happen when the pressure gets right up- not much in the way of gentle declines- guess it must be waking me up or perhaps I mouth breathe
when the pressure is on.
Going to try a chin strap to see if it fixes the breaks.

thanks Oscar.

I must be missing something because all I see on there is one central with a (10) above it indicating it lasted 10 seconds and one hypo????

I wasn't able to read your image before, but just clicked on it, and it enlarged. Yes, Oscar98 is correct, one Central Apnea lasting for 10 seconds, and one hypopnea.

Leak line is pretty good, with only a few blips.

If you go to your Summary Page, it will give you AHI, AI, CAI, Leak Rate at 95% pressure, etc.