Hello Guest, Welcome to Apnea Board !
As a guest, you are limited to certain areas of the board and there are some features you can't use.
To post a message, you must create a free account using a valid email address.

or Create an Account

New Posts   Today's Posts

[CPAP] OA Events preceded by flow spike
I was looking at the data for the last few nights. I notice that most of my OA events are preceded by a large spike in the flow rate. So I am curious what that is. Is that like a gasp followed by not breathing for a while? I would think if there was an apnea starting it would be preceded by a decline in flow as the blockage set in. It looks more like a gasp followed by holding by breath.

Attached is a zoomed in view of one of my typical OA events

Attached Files Thumbnail(s)
Post Reply Post Reply
That's an interesting observation. I do not have the same patterns with my OA's. Generally my flow rate curve starts having a lower amplitude, like a hypopnea, but then I stop breathing.

Do any of the other graphs reveal anything interesting happening right before the OA? Since your pressure was steadily increasing before the OA, I'm wondering if you were snoring, and that was that last loud snore right before the airway closes. That seems to be a common pattern for those with that cycle of snore followed by an OA.
Post Reply Post Reply
Hi rhodesengr,
WELCOME! to the forum.!
Hang in there for more help with your graphs. and much success to you with your CPAP therapy.
Post Reply Post Reply

You may be holding your breath. There is a large inhale and no exhalation, on the graph during the OA event, then a second inhale and normal breathing. I would 'guess' you may have exhaled through your mouth, registering an OA. Could be a dream or a yawn, but I doubt you experienced much, if any desaturation. there is just a bit of recovery breathing.

Is this typical, or a one-off?
Post Reply Post Reply
(02-02-2016, 07:50 PM)Possum Wrote: Since your pressure was steadily increasing before the OA,

well it looks that way on the zoomed-in timescale but that pressure change is just one of the random pressure test pulses the PR560 puts out. It is not due to anything going on with my breathing. I asked about these pressure spikes elsewhere and was informed that PR machines just do that, i.e. they randomly poke you with a pressure pulse. If you look at the zoomed out graph, there are many of them throughout the night.

There may be other graphs of interest but I think they show the same thing. For example, there is a big spike on Tidal Volume showing a lot of air going in and slowly going down. So that also looks like a gasp before an OA.

(02-02-2016, 08:58 PM)Sleeprider Wrote: Is this typical, or a one-off?

typical of pretty much all my OA events. The spike varies some and I generally only have about 3 per night but I'd say the one I posted is pretty much like almost all of the others over various nights.

Post Reply Post Reply
I would guess that you took a large breath and then tossed and turned in bed and it took you 10+ seconds to settle in the new position. And the machine duly noted this as apnea.
Started APAP 4-20, Closed range to 7.5-14, then straight 8.0 w/ Aflex 3
RDI always below 1. But sleep much much better at straight pressure.
Started on F10, Tried Quattro Air successfully. Finally settled on P10.
Post Reply Post Reply

Possibly Related Threads...
Thread Author Replies Views Last Post
  OA - are the events ever false positive?? rbookman 2 76 Yesterday, 10:46 AM
Last Post: Sleeprider
  Increase in Events per hour Dennisl27 3 127 10-10-2017, 08:32 PM
Last Post: Sleeprider
  Why is this not tagged? [CA events] mltam 6 175 10-05-2017, 06:49 PM
Last Post: Walla Walla
  Very Frustrated - Seeking Advise [about CA events] BlueJay22 6 262 09-27-2017, 01:46 PM
Last Post: Sleeprider
  [Treatment] Flow Limitations, a problem or not? storywizard 9 270 09-23-2017, 08:34 AM
Last Post: Sleeprider
  Breathing Events Affect Sleep Onset Unison 9 293 09-10-2017, 02:55 AM
Last Post: SnoringInOregon
  How 'real' are events recorded by machine? nathanoj 4 335 08-31-2017, 09:23 PM
Last Post: nathanoj

Forum Jump:

New Posts   Today's Posts

About Apnea Board

Apnea Board is an educational web site designed to empower Sleep Apnea patients.

For any more information, please use our contact form.