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Resmed A10 Pressure runup without apparent cause
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Ed1101 Offline

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Posts: 76
Joined: Feb 2016

Machine: Resmed AirSence 10 Autoset
Mask Type: Full face mask
Mask Make & Model: ResMed Aifit F10
Humidifier: Integral
CPAP Pressure: 15-20
CPAP Software: ResScan SleepyHead

Other Comments: Began APAP 8 Feb 2016. Titration Study AHI=29 PreCPAP AHI= 86

Sex: Male
Location: Richardson TX

Post: #1
Question Resmed A10 Pressure runup without apparent cause
My A10 occasionally starts a pressure increase from my minimum of 15 to 20 in a matter of a few minutes. My usual 95% pressure is less than 16.5 cm and only increases from 15cm due to certain flagged events. Normally appears to increases by about 0.5 cm per event. Often this "run away" increase is after first startup at night or a restart after standby. The is no apparent events and the flow limit is below 0.25 with leaks ~10 L/min. Usually if I have gone to sleep, the mask blow-out will wake me and I will put the unit in standby monentarily and then restart and all will be ok. Occurred 4 times this past week - twice in one night. This is a new replacement unit. The first unit died but did not exhibit the pressure runaway as evidenced by review in Sleepyhead over first 30 days of use.

Anyone experienced pressure run away with their A10.

It does not matter how slowly you go as long as you do not stop. --Confucius
04-02-2016 10:49 PM
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sonicboom Offline

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Posts: 473
Joined: May 2015

Machine: Airsense 10 AutoSet
Mask Type: Nasal pillows
Mask Make & Model: ResMed AirFit P10, Dreamwear
Humidifier: Integrated
CPAP Pressure: 4.6-7.6
CPAP Software: ResScan SleepyHead

Other Comments:

Sex: Male
Location: Washington

Post: #2
RE: Resmed A10 Pressure runup without apparent cause
Yes - but at pressure less than 10 with max settings less than 10 and the machine blowing past set maximums to 10. Determined to be caused most likely by rainout conditions. See this thread:

http://www.apneaboard.com/forums/Thread-...alfunction

Coffee
04-02-2016 11:51 PM
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zonk Offline

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Posts: 7,908
Joined: Feb 2012

Machine: A10 AutoSet
Mask Type: Nasal mask
Mask Make & Model: Activa LT
Humidifier: Integrated /ClimateLineAir
CPAP Pressure: 9/13
CPAP Software: ResScan

Other Comments: CPAP since Nov 2010

Sex: Male
Location: Australia

Post: #3
RE: Resmed A10 Pressure runup without apparent cause
(04-02-2016 10:49 PM)Ed1101 Wrote:  Anyone experienced pressure run away with their A10.
My A10 tend to have this tendency, no leak or rain
Never had this issue with the S9

I had to lower the top number and only allow it to go as high as necessary for best results
04-03-2016 01:02 AM
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Ed1101 Offline

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Posts: 76
Joined: Feb 2016

Machine: Resmed AirSence 10 Autoset
Mask Type: Full face mask
Mask Make & Model: ResMed Aifit F10
Humidifier: Integral
CPAP Pressure: 15-20
CPAP Software: ResScan SleepyHead

Other Comments: Began APAP 8 Feb 2016. Titration Study AHI=29 PreCPAP AHI= 86

Sex: Male
Location: Richardson TX

Post: #4
RE: Resmed A10 Pressure runup without apparent cause
Reviewed one of the graphs in Sleepyhead and in ResMed 5.5 that show ramp up of pressure.

The SH graph expanded:
[Image: bIyYzfT.png]

The ResMed 5.5 Graph expanded (same time range):
[Image: 1GHdU4w.png]

Initially, I only looked at SH detail graph. The SH flow limit graph does not seem to indicate a limit at first look, but I assume the flat tops mean that there is a flow limit. I had assumed that the graph would go to 1.0 or max out on the 0.0 -> 0.05 scale. The ResMed graph seems to show the flat top characteristic of a flow limitation.

Perhaps this explains the ramp-up. I use heated hose and loops above my head in "U" around bed post - rainout unlikely.

Can someone tell me how to interpret the SH flow limit graph?

It does not matter how slowly you go as long as you do not stop. --Confucius
(This post was last modified: 04-03-2016 02:57 PM by Ed1101.)
04-03-2016 02:55 PM
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vsheline Offline

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Posts: 1,907
Joined: Jul 2012

Machine: S9 VPAP Adapt (USA Model# 36007, not better 36037 or 36067)
Mask Type: Full face mask
Mask Make & Model: F10 or SimPlus w/ 2Liners. MirageQuatro & Gecko gel pad
Humidifier: H5i
CPAP Pressure: 15 EPAP, PS 5-10
CPAP Software: ResScan

Other Comments: Marfan Syndrome, chronic bradycardia, occasional Cheyne-Stokes Respiration

Sex: Male
Location: California, USA

Post: #5
RE: Resmed A10 Pressure runup without apparent cause
Hi Ed1101,

Regarding terminology, there is no such thing as a Flow Limit graph. There is a Flow Limitation graph which plots how much the Flow graph is exhibiting the symptoms of Flow Limitation (FL).

The Flow graph shows the rate (volume per second) at which we are inhaling air into our lungs (positive Flow) or exhaling air (negative Flow).

FL is occurring when the positive portion (the inhalation portion) of the Flow graph shows flattening instead of a normal rounded hilltop shape.

FL indicates our airway is partially obstructed and the suction created by inhaling is causing the airway to narrow further, such that increased breathing effort yields the same or less Flow.

If FL does not lead to hypopnea FL can still lead to Respiration Effort Related Arousal (RERA) which is an awakening or arousal into a shallow stage of sleep caused by having to exert excessive breathing effort.

Increasing the inhalation pressure (IPAP) tends to prevent FL.

Membership in the Advisory Member group should not be understood as in any way implying medical expertise or qualification for advising Sleep Apnea patients concerning their treatment. The Advisory Member group provides advice and suggestions to Apnea Board administrators and staff on matters concerning Apnea Board operation and administrative policies - not on matters concerning treatment for Sleep Apnea. I think it is now too late to change the name of the group but I think Voting Member group would perhaps have been a more descriptive name for the group.
(This post was last modified: 04-03-2016 05:18 PM by vsheline.)
04-03-2016 04:54 PM
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green wings Offline

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Posts: 544
Joined: Feb 2016

Machine: Respironics System One RemStar Pro (460)
Mask Type: Nasal pillows
Mask Make & Model: AirFit P10
Humidifier: integrated humidifier
CPAP Pressure: 13.0 cm
CPAP Software: SleepyHead

Other Comments: using CPAP since Jan. 2016

Sex: Undisclosed
Location: US

Post: #6
RE: Resmed A10 Pressure runup without apparent cause
Ed,

What does that SH graph look like for the time period ~0409-0412? Did you say that the flow rate waveforms have flattened tops?
04-03-2016 05:34 PM
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PaytonA Offline
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Posts: 3,005
Joined: Dec 2013

Machine: ResMed S9 VPAP Auto
Mask Type: Full face mask
Mask Make & Model: Resmed Mirage Quattro
Humidifier: H5i(distilled-top up)
CPAP Pressure: VAuto MinE14.0 MaxI 20.6 PS4.0
CPAP Software: ResScan SleepyHead

Other Comments:

Sex: Male
Location: Orange County,California

Post: #7
RE: Resmed A10 Pressure runup without apparent cause
One additional note. The pressure increase does seem to follow the flow limitation graph both increase and decrease. Looks very much to me like the machine is responding to flow limitations.

Best regards,

PaytonA
04-03-2016 05:50 PM
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palerider Offline

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Posts: 440
Joined: Nov 2014

Machine: s9 vpap auto
Mask Type: Nasal pillows
Mask Make & Model: p10
Humidifier: none
CPAP Pressure: 18/13+
CPAP Software: SleepyHead

Other Comments:

Sex: Male
Location: Dallas(ish)

Post: #8
RE: Resmed A10 Pressure runup without apparent cause
(04-03-2016 02:55 PM)Ed1101 Wrote:  Can someone tell me how to interpret the SH flow limit graph?

you interpret it the exact same way as the resscan graph. higher is worse.

the 'flat tops' you seemed to be referring to are in the *flow* graph, when you zoom in far enough to see the individual breaths.
04-03-2016 05:59 PM
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Ed1101 Offline

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Posts: 76
Joined: Feb 2016

Machine: Resmed AirSence 10 Autoset
Mask Type: Full face mask
Mask Make & Model: ResMed Aifit F10
Humidifier: Integral
CPAP Pressure: 15-20
CPAP Software: ResScan SleepyHead

Other Comments: Began APAP 8 Feb 2016. Titration Study AHI=29 PreCPAP AHI= 86

Sex: Male
Location: Richardson TX

Post: #9
RE: Resmed A10 Pressure runup without apparent cause
(04-03-2016 05:34 PM)green wings Wrote:  Ed,

What does that SH graph look like for the time period ~0409-0412? Did you say that the flow rate waveforms have flattened tops?

Not sure what you are asking. Do you mean expanded further than shown? The flow limitation graph waveform has flattend tops to a degree. I'll look at the flow rate graph closer. Do not know if the flow rate waveform has flattened tops.This looks like my normal Flow rate waveform, flat tops on them normally:
[Image: boe48iP.png?1]

(04-03-2016 05:50 PM)PaytonA Wrote:  One additional note. The pressure increase does seem to follow the flow limitation graph both increase and decrease. Looks very much to me like the machine is responding to flow limitations.

Best regards,

PaytonA

I have used the SH software for about a month. As I stated I had assumed, apparently erroneously, that the flow limitation graph would expand to take the whole chart range if there was a flow limitation. Now I think I understand that any value above 0.0 indicates some degree of flow limitation that the machine is attempting to eliminate by increasing pressure if the limitation as great enough to trigger the pressure increase. Is my understanding correct?

(04-03-2016 05:59 PM)palerider Wrote:  
(04-03-2016 02:55 PM)Ed1101 Wrote:  Can someone tell me how to interpret the SH flow limit graph?

you interpret it the exact same way as the resscan graph. higher is worse.

the 'flat tops' you seemed to be referring to are in the *flow* graph, when you zoom in far enough to see the individual breaths.

I understand that higher is worse. How high would one expect it go if no air is flowing and what is the meaning of the "flat tops" on the flow rate graph? I do not understand the scale on the flow limitation chart.

Thanks for the explanation Vsheline, but I do not see a positive and negative on the flow limitation graph only what appears to be positive?

It does not matter how slowly you go as long as you do not stop. --Confucius
(This post was last modified: 04-03-2016 07:32 PM by Ed1101.)
04-03-2016 06:35 PM
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Ed1101 Offline

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Posts: 76
Joined: Feb 2016

Machine: Resmed AirSence 10 Autoset
Mask Type: Full face mask
Mask Make & Model: ResMed Aifit F10
Humidifier: Integral
CPAP Pressure: 15-20
CPAP Software: ResScan SleepyHead

Other Comments: Began APAP 8 Feb 2016. Titration Study AHI=29 PreCPAP AHI= 86

Sex: Male
Location: Richardson TX

Post: #10
RE: Resmed A10 Pressure runup without apparent cause
Seems trying to add a chart , I inadvertently posted twice and I cannot delete. One should not be logged in on iPad and then add image on computer without logout on iPad first. See post #9 for chart and reply.

It does not matter how slowly you go as long as you do not stop. --Confucius
(This post was last modified: 04-03-2016 07:25 PM by Ed1101.)
04-03-2016 07:16 PM
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