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Waveform riddle
[Image: 1f2a31262bbc42629c74eca5e9faea78.jpeg]

[Image: f99119511a1344ffa216858a370c0869.jpeg]

Now, both clips are from the same night, the first one early and the second one near the end of the session. This is a classic case of something. Can you guess what it is?
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I hate to be first to submit, but it looks like shallow breathing due to flow limitations. But I also see delayed inhalation, and I'm not sure how that is related, nor what it may mean.

It is also late, and I'm not wide awake...
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Impedance mismatch ?
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I'm with pholynyk. Looks like a flow limitation possibly due to partially closed airway and when inhalation starts the pressure opens your airway and air flow increases.

Using FlashAir W-03 SD card in machine. Access through wifi with FlashPAP or Sleep Master utilities.

I wanted to learn Binary so I enrolled in Binary 101. I seemed to have missed the first four courses. Big Grinnie

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COPD? (Wild guess -- no science behind it.)
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One guess is as good as another. The fact that I know why I woke up doesn't make me any better at analyzing complex waveforms.

However, since I awoke due to a completely restricted nose (suffocating), I tend to think there may be something to learn from those two waveforms, especially when we see someone with a similarly superimposed non-sinusoidal component of a similar frequency. I can't say and don't mean to imply that it is always caused by a plugged nose.

I normally use a corticosteroid (fluticasone propionate) daily (2 sprays/ea. nostril) but I had failed to renew my supply and was going without it for a couple of days prior to this incident. That give even more credence to the point that nasal restriction can play a major part in sleep apnea. In my case, it is the major factor. The fact that I have COPD makes me extremely sensitive to any small reduction of air flow. As always, YMMV.

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Doesn't look much different than mine..
[Image: Flow.jpg]
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Yep, when we think we can interpret the extent of our malady by relying on a machine that reports data that some software can use to generate complex waveform displays based on a predefined sampling rate and some mysterious algorithm, we may be led astray.

Trust but verify comes to mind. CPAP is a treatment for sleep apnea but it isn't the only treatment. I'm happy to say that my sleep apnea problem turned out to have a simple solution, topical spray nasal treatment with a corticosteroid. I don't need a blower and a mask attached to my face, which I tried for quite a while and very well understand the discomfort involved. I'm not saying your experience will be the same, but just saying that you should consider it while pursuing all the other alternatives. This is especially true if you are primarily a nose breather. If relieving nasal congestion could possibly save you from having to subject yourself to a cpap machine and mask, it's certainly something to try as you make that journey. As always, YMMV

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