SmartStop on Resmed Airsense 11 Autoset

So last night my Airsense stopped 7 times, but only two of those times were caused by removing the mask to go to the bathroom.
My machine has SmartStart and SmartStop enabled.
I suspect that the machine stopped on it's own was due to a detected large leak. Is that reasonable? If so, what is the threshold (l/min) that would trigger the SmartStop?

Second part of this question: What happens if SmartStart is enabled and SmartStop is disabled? (I'm presuming that the machine would continue to operate and record during bathroom breaks and would only stop when I manually push "the button" when I get up for the day. If I were to forget to STOP the machine, would it just continue to run for hours and hours - would it shut down by itself ever?)

Airsense 11 in Auto mode, F30 mask

dataq1 wrote: ↑

Mon Dec 13, 2021 12:57 pm

I suspect that the machine stopped on it's own was due to a detected large leak. Is that reasonable? If so, what is the threshold (l/min) that would trigger the SmartStop?

My philosophy is why worry? Disable SmartStop. It's easy to turn the machine off when I get up for any reason. Additionally, I don't want the machine to stop blowing if I hit a large leak. I want the blowing to wake me up so I can fix the leak.

dataq1 wrote: ↑

Mon Dec 13, 2021 12:57 pm

What happens if SmartStart is enabled and SmartStop is disabled? (I'm presuming that the machine would continue to operate and record during bathroom breaks and would only stop when I manually push "the button" when I get up for the day. If I were to forget to STOP the machine, would it just continue to run for hours and hours - would it shut down by itself ever?)

What happens if you leave the fan on in the bathroom all day? What happens if you walk into the office and leave your pickup truck engine running all day?

If it were easy to press the buttons then I'd have no issue. Because of the physical location of the machine, pressing the button is a a bit difficult.

If I had left the machine running last night, by disengaging SmartStop, (and then had my husband kneel down to press stop when I was up for the day), my hours would have been 9.5 instead of 6.75. The events (assuming the same number of events) would have resulted in lowering my AHI for the night from 1.8 to 0.8. However, there is no reason to anticipate that I'd had no events when the machine was off.

So what I'll try out is disengaging the SmartStop and have hubby crawl around to turn off the machine after I am up for the day, and just not worry about bathroom breaks. We'll see how that works.

Still don't know what the threshold for triggering the Smartstop (but kinda assume that it's a massive leak, like when the mask is completely removed or the tubing is disconnected.

If you have ANY significant leakage issues at all, then you should disable the (not-so-) Smart Stop feature. Otherwise, it will just keep turning therapy off every time it sees an extended large leak (exact threshold not published by manufacturer, so it’s anybody’s guess).

If I had left the machine running last night, by disengaging SmartStop, (and then had my husband kneel down to press stop when I was up for the day), my hours would have been 9.5 instead of 6.75.

I haven’t tested this on my AS11, but I don’t think that is true. Resmed’s software will differentiate between time “on” and time actively “used” (based on flow pattern). Turning it on for X hours without actually using it will not result in X hours usage, at least not as reported by Resmed’s MyAir, Airview, or ResScan software. In computing “Compliance” the software definitely differentiates between “on” and “used”.

In my senior year of high school, I absentmindedly left the Rambler
idling in the parking lot for 3 hours. Thereafter, it guzzled oil relentlessly.

Going to see tonight the impact of SmartStop disengaged.

Do you think that time in large leak is not counted when calculating the Indices? I hadn't thought about that before, but it would actually make sense since there is no event scoring during large leak periods (I think that is correct?)

chunkyfrog wrote: ↑

Mon Dec 13, 2021 9:56 pm

In my senior year of high school, I absentmindedly left the Rambler
idling in the parking lot for 3 hours. Thereafter, it guzzled oil relentlessly.

I was wondering if the machine would recognize that it had been in MASSIVE leak AND that there were no changes in flowrate and just shut itself down after some period of time, without the benefit of "smart-stop".
Hopefully these very smart machines would recognize that there is no person at the end of the tubing.

Nope, they're not that smart.
Basically, not breathing means you've probably passed;
---in which case it no longer matters.

Actually Respironics machines do offer the BND...Breathing Not Detected....flagging. We have seen those reports here at the forum from time to time.
I thought ResMed did as well but I can't find any proof so maybe I just dreamed it.

You will know soon enough what ResMed reports (or doesn't report) after tonight.

Pugsy wrote: ↑

Mon Dec 13, 2021 11:54 pm

Well last nights "experiment" was informative.
Just to recap, the only alteration to the settings was to disable the SmartStop feature.
Last night there were 10 large leaks. On a duration basis they are in two groups, one group is less than 10 seconds, the other group is 60 seconds or greater.
What was nicely identifiable were the LL events that were the result of mask removal, as seen here:


Not only does the leak rate suddenly go through the roof , but also the flow rate increases to >150 l/min.
What is also interesting is that apparently recording was suspended after approx 80 seconds and then resumed some minutes later (after bathroom break and replacement of mask).


I am speculating that the denominator used to calculate indices is probably the recording time (which really makes sense).

Whether the machine would keep pumping air indefinitely against no back pressure, was not something I was looking to test, I was only interested in how the denominator for the indices was created.

Hope y'all had a great night's sleep!

dataq1 wrote: ↑

Tue Dec 14, 2021 10:31 am

Whether the machine would keep pumping air indefinitely against no back pressure, was not something I was looking to test,

I don't know if there is a time limit for how long it will pump air with no back pressure but I have "aired" out used machines to get rid of objectionable odors by just setting the machine outside on the porch and letting them blow air for hours and hours which they will do if a hose is attached and the auto off function is disabled.

I think the longest time I have let a machine just run is about 16 hours at one time. I hesitate to let the machines run overnight while I am asleep just as extra caution.
Now with today's machines this blowing with no human attached only affects run hours but in the past it used to count as usage hours. It was how people would cheat on compliance hours to beat the system and fulfill any legal obligations they might have. OTR truck drivers was one area where there was some cheating. Getting insurance to pay for the machine and that compliance requirement was another.
Now there can be no cheating.

I suspect the machine would blow indefinitely until the power was interrupted in some fashion.

Also a side note...there are situations where the machine will continually blow at full pressure and the human isn't attached. If there is enough back pressure from simply the inherent resistance in the mask it won't shut off even if the auto off function is enabled. This happened to me just last week...the mask and pressure I use just won't turn off even with SmartStart (AirSense 10 machine only has SmartStart for the auto on/auto off feature) enabled. It's my mask and pressure combination that causes this to occur and it's even mentioned in the manuals. I known issue with some masks at some of the lower pressures. Last week I go to get ready for bed and the machine was blowing full pressure. I always manually turn it off in the morning because I know with the mask I am using it simply won't shut off on its own.
BUT...I have kitties in my house and I suspect one of them stepped on the on/off button and turned the machine on.
They have also been known to turn the machine off in the middle of the night which usually causes an immediate awakening.
I haven't looked at the data to see how long it blew by itself because it doesn't really matter and isn't a big deal to me.

Hi guys,
helping my elderly mom out in assisted living, got her the air sense 11 from cpap.com
how do I get the Graphs you are showing?
all I have access to is the score in the app

thanks
Keith

Hi Keith,
in answer to your question please click on this link:
[https://www.cpaptalk.com/viewtopic/t172 ... STING.html][/url]
Then pay particular attention to point #3 and #4,
Also, try to keep questions/comments you might post revevant to the topic of the thread ( I almost missed your question because it did not relate to Smartstop)
Good luck,

gandalfnet wrote: ↑

Fri Apr 29, 2022 9:58 am

Hi guys,
helping my elderly mom out in assisted living, got her the air sense 11 from cpap.com
how do I get the Graphs you are showing?
all I have access to is the score in the app

thanks
Keith

Keith, as you have more questions, please start your own thread and continue to post in it as things come up. It's easier for members to follow your history (mom's history) that way.

Welcome to the forum,

ElderlyGranny