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Hi all,
I'm a moderate OSA and I've been having more AFIB heart arrhythmia incidents lately, so decided to really look over my Oscar reporting move closely than usual. I'm not adept with Oscar and am hoping to get some help with something weird. Normally, I ignore the Sessions line and just check AHI. It is rare for me to get up during the night, but for some reason I noticed having multiple sessions on several nights, so looked at things more closely. It looks like the daily report's chart line for tidal volume seems to fizzle out, as though my breathing became very shallow, and then my machine shuts off (I do have autostart turned on, which will turn off the machine if I take the mask off).
This has only been happening since February, just a few times a month, about the same time as the re-emergence of my AFIB issues -- but not obviously related time-wise.
Can this happen if I mouth breathe? I wear a nasal mask. Any other ideas/suggestions?
If autostart/stop are doing so at times they shouldn't, such as shallow breathing, simply don't use them, at least until that issue is resolved.
Please always list the standard charts. The Flow rate chart should provide some onsite on this. Do feel free| to supplement those charts with any you feel will highlight your issue.
Gideon - Project Manager Emeritus for OSCAR - Open Source CPAP Analysis Reporter
Shallow breathing is *not* turning your machine off. Your machine is not being turned off.
There have been occasions where Smart Start/Stop have incorrectly triggered a shutdown, but this isn't one of them. Incorrect Smart Stops are triggered by excessive leaks, not shallow breathing.
This is a data corruption or display problem.
We know your machine is not being shut down because resumption is occurring at a value well above your start pressure (5cm). This is especially noticable when there is brief gap and the pressure is almost exactly at where the interim begins.
What I suggest when I see this gapping occur is to set a ramp either to minimum (5 minutes) or auto, with a pressure just slightly below the min. pressure.
I suggest this not because I'm interest in ramp, but to demonstrate a machine power cycle hasn't occurred.
Consider switching SD Cards.
BTW, I agree that you minimum pressure is too low.
Thanks for the suggestions -- Two nights ago I upped my min pressure to 6 with EPR=2 (If I go to 7 suddenly I'll have nose bleeds). Also, of course, turned off autoStart/Stop. I didn't turn off the machine or even awaken either night, and the first night was unremarkable.
But, last night's report shows two sessions with another off/on event lasting over 1 1/2 minutes. When things resumed, I see that it was at the minimum pressure of 6 for a long time. Dog Slobber, I will turn on ramp tonight, it's not my favorite feature but I get why it would be helpful for diagnoses. The incident happened during shallow breathing, but it's more shallow elsewhere without the new session business.
We didn't lose household electricity last night. Power cord looks fine. I unplugged it and plugged it back in, and it does resume at min pressure of 6, only taking about 20 seconds to reboot (I didn't time it exactly). Could a power-supply issue cause results like shown in the charts? The machine is six months old.
A power supply, or other interruption could cause restart issues, but upon power-cycling the machine restarts at ramp pressure (if enabled) or minumum pressure.
In every graph you've presented, upon resumption of the graphs, the pressure has always been at (or near) the pressure therapy being delivered.
As stated, all the evidence suggests it's a data corruption or display problem. Not power cycling. I'd also like to add that if the machine has been powered off, many people will wake up. That too, hasn't happened.
Some things to try:
Try a different SD Card (problem SD Card)
Format the SD Card (might resolve a data corruption issue)
Upload your data to SleepHQ (if it displays properly there, it could be an OSCAR bug)
Look at your MyAir results. If the device is power-cycling you will see Mask On/Off counts higher for nights where your machine has powered off.
On the off chance, it is a power issue:
Check power cables are properly seated into back of device, power-brick, and outlet.
Consider changing power outlet.
If using an extension cord, or power strip change it out
Put another devices (clock) on same outlet to see if it's interrupted. (but some devices are less sensitive to interruptions or or under voltages.
If you have a spare ResMed, swap out its power brick. All ResMeds of the same model number use the same power brick.
If you have a battery backup, run off it for tonight
06-05-2023, 12:07 PM (This post was last modified: 06-05-2023, 01:33 PM by Dog Slobber.)
RE: shallow breating shuts off my apap?
K, so we've ruled out OSCAR bug.
SD Card, still the leading contender.
[Edit]
I should also add, since you have a C2C machine (no modem), and if you need to demonstrate compliance, you should not be formatting your SD Card. Unless you're comfortable backing it up onto your computer and restoring it, shold you need to bring it in.
If that's the case pick up a second SD Card, just get the cheapest one you can find, but not greater than 32GB.
