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[CPAP] OA Events preceded by flow spike
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rhodesengr Offline

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Posts: 24
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Machine: PR 560
Mask Type: Nasal pillows
Mask Make & Model: P10
Humidifier: PR DS6HFLG
CPAP Pressure: 6-20
CPAP Software: SleepyHead

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Sex: Male
Location: NorCal

Post: #1
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


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(This post was last modified: 02-02-2016 05:23 PM by rhodesengr.)
02-02-2016 05:16 PM
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Possum Offline

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Posts: 254
Joined: Oct 2015

Machine: Resmed Airsense Autoset A10
Mask Type: Nasal pillows
Mask Make & Model: Airfit P10
Humidifier: (included in CPAP model)
CPAP Pressure: 8-12
CPAP Software: ResScan SleepyHead

Other Comments: Innovo CMS-50F+ pulse oximeter

Sex: Male
Location: San Diego, California, USA

Post: #2
RE: OA Events preceded by flow spike
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.
02-02-2016 07:50 PM
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trish6hundred Offline

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Machine: Resmed S9 AutoSet for Her
Mask Type: Full face mask
Mask Make & Model: Fisher & Paykel Simplus
Humidifier: H5i Heated Humidifier
CPAP Pressure: 10 - 7-20 Cm H2O
CPAP Software: Not using software

Other Comments: I started CPAP in 2008. Totally blind since birth.

Sex: Female
Location: Missouri, USA

Post: #3
RE: OA Events preceded by flow spike
Hi rhodesengr,
WELCOME! to the forum.!
Hang in there for more help with your graphs. and much success to you with your CPAP therapy.

trish6hundred
02-02-2016 08:51 PM
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Sleeprider Online
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Posts: 3,309
Joined: Dec 2014

Machine: Resmed Aircurve 10 Vauto
Mask Type: Nasal pillows
Mask Make & Model: Resmed Airfit P10
Humidifier: Resmed Climateline
CPAP Pressure: Auto Bilevel 18/9, PS 3
CPAP Software: ResScan SleepyHead EncoreBasic

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Sex: Male
Location: Where they make Respironics

Post: #4
RE: OA Events preceded by flow spike
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?

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(This post was last modified: 02-02-2016 09:02 PM by Sleeprider.)
02-02-2016 08:58 PM
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rhodesengr Offline

Preferred Members

Posts: 24
Joined: Jan 2016

Machine: PR 560
Mask Type: Nasal pillows
Mask Make & Model: P10
Humidifier: PR DS6HFLG
CPAP Pressure: 6-20
CPAP Software: SleepyHead

Other Comments:

Sex: Male
Location: NorCal

Post: #5
RE: OA Events preceded by flow spike
(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.
(This post was last modified: 02-02-2016 10:07 PM by rhodesengr.)
02-02-2016 10:04 PM
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AshSF Offline

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Joined: Oct 2014

Machine: PRS1 D560TS
Mask Type: Nasal pillows
Mask Make & Model: ResMed P10, Bkup: Airfit F10 & Quattro Air
Humidifier: PRS1 60 series with Heated Tube
CPAP Pressure: 8 - 8 w/ Aflex 3
CPAP Software: SleepyHead

Other Comments: Using APAP mode with fixed pressure

Sex: Male
Location:

Post: #6
RE: OA Events preceded by flow spike
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.
02-03-2016 09:58 AM
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