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ASV questions
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PoolQ Offline

Advisory Members

Posts: 986
Joined: Jul 2015

Machine: AirCurve 10 VAUTO
Mask Type: Full face mask
Mask Make & Model: Amara View
Humidifier: Integrated
CPAP Pressure: 6.2, 15, PS4.0
CPAP Software: SleepyHead

Other Comments:

Sex: Male
Location: Sillicon Valley

Post: #41
RE: ASV questions
yep, it did just that. I was trying to get the start and end more sensitive (accurate?) but as you say it just made it cycle sooner. Didn't really think it through, and didn't leave it set to very high for more than a few minutes and I could tell that is was wrong direction.

I have to wonder if at least some people that give up on CPAP are having the same problem I was having with the machine not syncing up with my breathing. My FIL has made like 3 adjustments to his VPAP and has been fine ever since, for me I seem to be very sensitive to anything that disturbs by breathing.
06-26-2016 01:02 AM
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vsheline Offline

Advisory Members

Posts: 1,908
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: #42
RE: ASV questions
(06-25-2016 05:24 PM)PaytonA Wrote:  increasing the cycle sensitivity looks like it should cut off your inhale sooner according to Resmed's chart on page 5 of the clinicians manual.

Right.

PoolQ - "High" sensitivity means it will be advanced and happen earlier, and "Low" sensitivity means it will be delayed and happen later. If you would like the IPAP pressure to cycle back to EPAP later, I suggest you try setting Cycle sensitivity to Medium or Low.

However, just like increasing the setting for Pressure Support may increase the number of central events we get, anything which makes IPAP last longer may also increase the number of central events we get.

So, please note that although advancing Trigger to High or Very High may be more comfortable, this will make IPAP last longer and therefore may increase the number of central events we get.

Similarly, although delaying Cycle to Low or Very Low may be more comfortable, this will make IPAP last longer and therefore may increase the number of central events we get.

Take care,
--- Vaughn

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: 06-27-2016 03:23 AM by vsheline.)
06-27-2016 03:13 AM
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PoolQ Offline

Advisory Members

Posts: 986
Joined: Jul 2015

Machine: AirCurve 10 VAUTO
Mask Type: Full face mask
Mask Make & Model: Amara View
Humidifier: Integrated
CPAP Pressure: 6.2, 15, PS4.0
CPAP Software: SleepyHead

Other Comments:

Sex: Male
Location: Sillicon Valley

Post: #43
RE: ASV questions
Vsheline as always thank you for your input. For now I just changed the one (left it changed anyway) with no impact on my central count. Your suggestion of increasing the starting pressure because of my breathing pattern is what made the final difference.

I just went back and looked at the waveform. I used to have recovery breaths that declined to very close to zero in-between and repeating.

Now I still get the repeating pattern but the low point is no where close to zero, so overall more actual breathing going on with productive breaths. Seems to have made all the difference.
(This post was last modified: 06-27-2016 03:14 PM by PoolQ.)
06-27-2016 02:51 PM
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PoolQ Offline

Advisory Members

Posts: 986
Joined: Jul 2015

Machine: AirCurve 10 VAUTO
Mask Type: Full face mask
Mask Make & Model: Amara View
Humidifier: Integrated
CPAP Pressure: 6.2, 15, PS4.0
CPAP Software: SleepyHead

Other Comments:

Sex: Male
Location: Sillicon Valley

Post: #44
RE: ASV questions
After thinking about this some more, I now remember why I was adjusting the trigger and cycle sensitivity. I had been reading about ventilators and how important it was to "sync" them to the natural breathing pattern of the patient.

I was not trying to lengthen the inhale time, I had set that at max of 4 seconds just to get it out of the way. This time setting does not force you to inhale longer, but if you try to extend your inhale longer than this setting it will drop the pressure. This is what got me started looking into this area in the first place, default is 3 seconds and my inhale is around 3.6.

My attempt to "sync" the start and stop if inhale worked and finally got me to the point I am at.
06-29-2016 10:55 AM
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