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Why are my CA same as OA in flow rate graphs?
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Sleeprider Online
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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: #11
RE: Why are my CA same as OA in flow rate graphs?
(02-22-2016 09:41 PM)Ed1101 Wrote:  
(02-22-2016 06:44 PM)justMongo Wrote:  Sleeprider: You notice that Ed1101 has Itime > Etime. And, low tidal volume?
Plus fast median resp rate.

(02-22-2016 09:24 PM)Sleeprider Wrote:  Jm, I missed it. It's not as extreme as some recent cases we've seen, and I don't know if it's even significant. Tidal volume seems okay if this is not a large person, but the respiratory rate is 24 bpm, which is on the high side. Hard to say without more information. The waveform looks pretty good other than the apnea. To be honest, I don't know of any spontaneous PAP therapy that targets those parameters.

tom
I am 6' 1" and weight is ~250. I am seeing a Pulmonologist about reduce lung capacity.

Well, we are close to the same size and FWIW my tidal volume runs about twice yours. Your apnea is pretty well treated on your current machine. With reduced lung volume, it is possible to encourage improved ventilation using pressure support (difference in pressure between IPAP and EPAP), and your machine can provide up to 3 cm of EPR (pressure support). A bilevel (Aircurve 10 Vauto) machine can provide much more pressure support.

Something you might want to try is to change your EPR from 1 to 3. This will encourage more complete exhale and provide a comfortable pressure increase to help with inhale. It's not a good as a bilevel, but it can make a difference.

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AshSF Offline

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Posts: 356
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

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Post: #12
RE: Why are my CA same as OA in flow rate graphs?
Doesn't the resmed machine use an FOT to distinguish between a CA and OA? By definition an apnea is near cessation of flow for 10+ seconds. And the FOT kicks in to classify them properly? And I am assuming that SH can't show FOTs.

Maybe the resmed folks can comment.

Since your pressure doesn't budge much from 15, you may want to increase EPR to 3. It will help you exhale completely and may reduce your RR and I.E. Ratio ; and increase TV. It may increase CAs but they may settle down in a few weeks.

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.
(This post was last modified: 02-23-2016 01:45 PM by AshSF.)
02-23-2016 01:41 PM
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Sleeprider Online
Wiki Editor
Advisory Members

Posts: 3,302
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

Other Comments:

Sex: Male
Location: Where they make Respironics

Post: #13
RE: Why are my CA same as OA in flow rate graphs?
FOT is clearly visible in Sleepyhead, as are the PR pressure pulses. The pressure pulse in Respironics, produces a pronounced flow change in CA, while, for me anyway, it's hard to interpret Resmed FOT fluctuations. FOT is the small amplitude wave.

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02-23-2016 01:49 PM
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justMongo Offline

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Machine: ResMed VPAP Auto (S9)
Mask Type: Full face mask
Mask Make & Model: ResMed Mirage Quattro
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Post: #14
RE: Why are my CA same as OA in flow rate graphs?
(02-23-2016 01:49 PM)Sleeprider Wrote:  FOT is clearly visible in Sleepyhead, as are the PR pressure pulses. The pressure pulse in Respironics, produces a pronounced flow change in CA, while, for me anyway, it's hard to interpret Resmed FOT fluctuations. FOT is the small amplitude wave.

Right, the FOT is a 1 cm-H2O amplitude, 4 Hertz wave imposed on the pressure. It begins about 4 seconds after cessation of flow. It is clearly visible in the high sample rate flow and pressure data. The scoring is based on the flow sensor data. Classification likely involves amplitude of the reflected wave; and perhaps phase.

(Probably amplitude as an open airway leads to the aveoli that would dampen the reflected wave.) I'm sure it's not 100% accurate.

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02-23-2016 02:38 PM
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