Flow waveform change before OA

[SakimaStorm]

Hello all,

Been looking at my OSCAR charts and noticing a pattern. Usually a couple of minutes before an OA, I have what I call a garbage breath, followed by a triangular shaped right sloping inspiratory breaths till the OA. Then a recovery breath and back to a normal flow pattern. Any idea what causes the waveform to go from normal to a right sloping triangular wave? They do seem to happen on the second half of the evening if that means anything.

I am attaching 2 screenshots. 1 showing what I consider my normal flow and 1 showing the distortion that occurs after a garbage breath and precedes the OA.

thanks.

s.

[sheepless]

the difference between the two curves is the time between exhale and inhale. my guess is that before the oa, you're working a little harder to breathe through mounting restriction, moving more quickly from exhale to inhale.

[SakimaStorm]

Thank you Sheepless. That makes sense.