Interpretation Questions - My OSCAR Data

[ApneaQuestions]

Any idea what this ripple is?

See my notes on the image.  It's not the CA-OA detection ripple.

My best guess is low-level vibratory face-mask leak (think face-flatulence)

Any other theories?

PS. If it IS face-flatulence then that would be hilarious for people obsessing about RERA-like waveforms.

[CPAPUserDave]

ApneaQuestions pid='325361' dateline='1577049004']Any idea what this ripple is?

See my notes on the image.  It's not the CA-OA detection ripple.

My best guess is low-level vibratory face-mask leak (think face-flatulence)

Any other theories?

PS. If it IS face-flatulence then that would be hilarious for people obsessing about RERA-like waveforms.

[attachment=18294]

looks like what I have going on.
I do not think it is face-flatulence because I experienced that when i was at higher pressures, but now my pressure range is so low, it's not a problem. but maybe?? I was thinking flow limitation which I have been working on reducing yet this waveform continues.
going to try playing around with the Ti Min/Max, Trigger settings to see what happens (Per SleepRider suggestion)

 i am curious if anyone has any other ideas too

[ApneaQuestions]

Because it starts where it does... it is at the start of an inhalation... It's like a labored "false start" in the inhale.

Almost as if the air passages seal and it takes some effort to "break the seal" and get air moving.

See what I mean?

PS It's like three of those "Norwegian Yes" effects... but very tiny ones.

[sheepless]

heartbeat affecting inhale?

[Gideon]

My first thought was expiratory snoring but the frequency seems too low for snoring. It is on the tail of the expiratory breath.

[ApneaQuestions]

Another shot from the hip..

If you imagine having a puddle of saliva lodged near the back of your mouth... and if you are a mouth breather (I am)... you can imagine a sort of mouth-wash gargling noise.
Trouble is I have constantly dry mouth especially on PAP so I doubt if I could generate that much drool even if I wanted too.

[ApneaQuestions]

I just measured the wavelength

It's about 0.7 seconds (0.654)

It seems a bit like "stacked breathing" but on the exhalation side.... I guess I will call it "stacked exhalation"

Try it yourself.. exhale all the way out then intentionally force a bit more air out... then a bit more... then a bit more (try not to cough).

Oh well... strange!

PS yes it IS on the tail of the exhale

[Sleeprider]

These regularly spaced bumps are most noticeable during the end of expiration when low flow rate is present, but it can be present during the entire respiratory cycle. It's heartbeat in this case, but more irregular or larger amplitude can be physical movement or even PLM.  When I count these in the example below, I get about 60 BPM (10 in 10-seconds). That's pretty normal, and the intensity and rate of heartbeats will vary through the night.  I see this in my own graphs but it is very subtle compared to this.  I think this may be more pronounced when you sleep on your left side and at times you might even be aware of a pounding heartbeat that has a small impact on respiratory flow.  I have seen this in many charts and can nearly always count a rate between 55 and 80 bpm.

[ApneaQuestions]

In my case it's 91.7 BPM

60 / 0.654 = 92 rounded

I must have a fast pulse

[ApneaQuestions]

.... PS. If it IS face-flatulence then that would be hilarious for people obsessing about RERA-like waveforms.

So this can also be "hilarious" for a similar but different reason.  (maybe I have a dark sense of humor... I like irony and satire).

Normal breathing with pulse effects superimposed will look very much like the RERA-like waveforms mentioned in several threads (including this one).
So this is something to be aware of for all the flow-spotters checking their waveforms in great detail.
If you see this effect on the tail of your exhales... don't be surprised if you also see it on top of your inhales.

Referring back to something I said in an earlier post...
Sometimes a chest pain is just your heart pounding.... sometimes an apparent flow-limitation may be the same thing!
So measure the wavelength and check the calculated BPM

Thanks everyone.. I think my mystery du jour is solved!  :-)