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quietmorning wrote:I take that back. I think there's a bug. . .it reports apnea events low and rera events high. I sent them an email to ask if they update firmware.

I seriously doubt that going to V3.03 will make a difference.

TS, there are a number of other reasons that could explain the discrepancy (the flows are different, the pressures are different, there may be an error floating around in the machine). What you really need to to is run the P Series Service Center Test to read the Error Log and check machine calibrations.

As presented by blakepro, Accurate did this for his machine after his upgrade (actually, it is required that this be done):





TS2, it might not be M2 that has the problem.

Good morning, Mollette, thank you - I think you're right. I'm not quite sure what to do about it at this point. Maybe send them both, one at a time (so that I can breathe) to have them both diagnosed to see what the problem might be.

I received an email from David Leard from Accurate Biomed Services Inc this morning. I may give them a call this week and talk to them further.

Can you get a hold of a decent quality manometer? If all you're having is a bunch of RERAs, maybe M2 pressure is a little low.

mollete wrote:Can you get a hold of a decent quality manometer? If all you're having is a bunch of RERAs, maybe M2 pressure is a little low.

I can probably do that. I've been looking around for one for a while - but I really don't know exactly what I'm looking for in the digital range. If you have the time, could you send me a link to one that would do the job that isn't overkill?

Well, it'd be cheaper to get a new machine than a digital manometer. I think one those little handheld flowtubes would be OK because you're doing a comparison.

mollete wrote:Well, it'd be cheaper to get a new machine than a digital manometer. I think one those little handheld flowtubes would be OK because you're doing a comparison.

Oh, ok. LOL. ..overkill from the get go, huh? I'll order one from CPAP.com. Thanks!

Mollete, I was going to see my DME this morning to look at some masks - so I took this machine with me and asked her to test it for me on her manometer - she did so, and it came out 9.99 which is exactly what my other machine came out as. (My set pressure is 10 - straight cpap).

OK, want to post the waveforms or upload the files somewhere? For the time being let's assume the flow is also accurate and see how event analysis is working (manually score events).

mollete wrote:OK, want to post the waveforms or upload the files somewhere? For the time being let's assume the flow is also accurate and see how event analysis is working (manually score events).

It will be a few days before I post these as I want to do a two day test on each machine using the same sealer, sleep time, etc. so that there's a good comparison. I'll start tomorrow night as I had a meeting tonight and I'm getting to bed later than I usually do.

I will post last night with M1 this afternoon when I clock out of work. I'll sleep with M2 tonight and post it tomorrow when I clock out of work in the late afternoon. Mollette, I am very uneducated in looking at wave forms - so if there is anything specific you want me to post? An apnea event or cluster exploded so that you can see the wave forms during that event? Let me know, I'll be happy to do so. Thank you for your help in this matter, Mollette.

Edited for correct waveform.

MACHINE A - from DME at Sleep Center

Looking at waveforms needs about a 60 second screen, like about:



but in magnifying that submitted RERA:



it ain't.

Also those OAs look more like CAs (post-arousal) to me (although 01:32:00 could be a sleep-onsety kind of thing).

ok, I'll edit the post above to corrected wave forms when I post the second machine's info tomorrow. Thanks!

Machine B - pself purchased

I would go with:

Hypopnea = Hypopnea
Hypopnea = Central Apnea
Central Apnea = Central Apnea
RERA = RERA
Obstructive Apnea = Central Apnea
RERA = Flow Limitation
Obstructive Apnea = Central Apnea