getting data from ResMed S9 autoset

[carlenemt]

i have the new ResMed S9 autoset which is supposed to have my sleep data in a removable card and onboard. the only thing i can find in the onboard data is hours used that night; how do i find the AHI, pressure, etc.?

[alterego61]

The clinical manual for the S9 will tell you how, and more. If you type s9 clinical manual into the search box at the top left of this page you should find some links for it.

[carlenemt]

the manual only shows me the buttons and says one push will give you the data but all i get is the hours of breathing last night, nothing else. have tried internet searchs.

[carlenemt]

REsMed should send this manual with the product! now i see i have to push both the info and setup buttons at the same time! so last night my pressure was 10 and my AHI was 1.8.....thanks!

[jishy]

You can get a really detailed report by doing the following.
To quote KatieW from a previous post...

To see your "Sleep Report", start at the Home page. Push and hold the "info" key and the "check" key at the same time. Then turn the dial counter clockwise one click. Then push the dial, and you can scroll through your Sleep Report: Hours used, Leaks, AHI, AI-Obstructive, AI-Central.

This can save your SD card some wear by just looking at your stats on the screen daily and download to your PC weekly.

[alterego61]

You can get a really detailed report by doing the following.
To quote KatieW from a previous post...

To see your "Sleep Report", start at the Home page. Push and hold the "info" key and the "check" key at the same time. Then turn the dial counter clockwise one click. Then push the dial, and you can scroll through your Sleep Report: Hours used, Leaks, AHI, AI-Obstructive, AI-Central.

This can save your SD card some wear by just looking at your stats on the screen daily and download to your PC weekly.

The SD card can stand 1,000s of cycles of use and is any case a very low cost standard item available in retail stores if you need to replace it so it doesn't really matter whether you download the data every day or not. If you want to look at the data every day, go ahead and download it. If not, just read the display on the machine like Katie said.

[jishy]

You can get a really detailed report by doing the following.
To quote KatieW from a previous post...

To see your "Sleep Report", start at the Home page. Push and hold the "info" key and the "check" key at the same time. Then turn the dial counter clockwise one click. Then push the dial, and you can scroll through your Sleep Report: Hours used, Leaks, AHI, AI-Obstructive, AI-Central.

This can save your SD card some wear by just looking at your stats on the screen daily and download to your PC weekly.

The SD card can stand 1,000s of cycles of use and is any case a very low cost standard item available in retail stores if you need to replace it so it doesn't really matter whether you download the data every day or not. If you want to look at the data every day, go ahead and download it. If not, just read the display on the machine like Katie said.

Sorry, I didn't read what I was typing... It's not so much the SD card but the SD card reader onboard the xPAP that is the major failure point that I'd be worried about. It has happened in the past if you do a quick search on here. Plus I have to draw a line with myself not to become obsessed with my therapy, in which I sometimes over-analyze the data when it's on the computer and spend an hour scrutinizing my high resolution flow rates and then freak out if something doesn't look completely normal, in which it actually isn't that bad.

[Datahound]

Great information thanks. Can someone tell me. The meaning behind the data elements: leak, ahi, total ai, central ai.

Thanks in advance

[robysue]

Great information thanks. Can someone tell me. The meaning behind the data elements: leak, ahi, total ai, central ai.

Thanks in advance

Here's a primer for the data that you can get directly off the detailed Sleep Report on the LCD of the S9 AutoSet. Since you didn't include numbers, I've made up some numbers for examples to give you a better idea of how things work.

Let's look at what those AHI, AI, and CAI numbers on your LCD actually mean. Let's suppose your overnight (one day numbers) one morning are:

• 
  AHI = 2.3
  AI = 1.4
  CAI = 0.3
  

And even though the OAI and HI are not shown on the S9's LCD, they're easy to get: the OAI = 1.4 - 0.3 = 1.1 and the HI = 2.3 - 1.4 = 0.9.

First the AHI, AI, CAI, OAI, and HI are all indices. They indicate how many events of the given type you had per hour on average during the time the machine was on:

• 
  AHI = average number of apneas (all types) + hypopneas per hour the machine was running
  AI = average number of apneas (all types) per hour the machine was running
  CAI = average number of central apneas per hour the machine was running
  OAI = average number of obstructive apneas per hour the machine was running
  HI = average number of hypopneas per hour the machine was running
  

And it helps to know what each kind of event is:

• 
  * The S9 will score a hypopnea when your airflow is reduced by at least 50% from baseline lasting at least 10 seconds. (and it believes there is some flow limitation, I think)
  * The S9 will score an obstructive apnea when your airflow is reduced by at least 80% from baseline (i.e. you're not breathing) lasting at least 10 seconds AND the S9 has determined that there is an obstruction in the airway
  * The S9 will score an central apnea when your airflow is reduced by at least 80% from baseline (i.e. you're not breathing) lasting at least 10 secondsAND the S9 has determined that there is appears to be no obstruction in the airway
  

The S9 computes each of these numbers (AHI, AI, CAI, OAI, HI) by dividing the number of events (of the particular type) by the time the machine was running. The S9 tells you how long the machine was run overnight in the usage number in Sleep Report. So to continue our example, we'll assume that the usage for the night in question is 7.5 hours. In that case, the number of each type of events the machine recorded for the night can be computed from the LCD data as follows:

• 
  (2.3 events per hour)x(7.5 hours) = 17.25, which equals about 18 events that night because the S9 truncates rather than rounds
  (1.4 apneas per hour)x(7.5 hours) = 10.5, which equals about 11 apneas that night
  (0.3 central apneas per hour)x(7.5 hours) = 2.25, which equals about 3 central apnea that night
  

A bit more arithmetic shows that there were likely 7 hypopneas (18 events - 11 apneas = 7 hypopneas) and 8 obstructive apneas (11 apneas - 3 central apnea = 8 obstructive apneas)

Now let's look at what the rest of the numbers you see on your S9's LCD, in ResScan (if you download the software for the S9), and discussed around here on cpaptalk, actually mean. I'll start with some really important key definitions so you know what these numbers mean. It's easiest to start with some examples. Since you don't say whether you're using an S9 Elite (CPAP only) or an S9 AutoSet running in CPAP mode, I'll assume you've got the S9 AutoSet running in CPAP. I'll use the numbers that you posted, as well as the fact that you currently have your S9 set to 10cm. And I'll continue to suppose that you slept with the S9 running for 7.5 hours and we're looking at the overnight data in ResScan or off the LCD for the numbers it shows. Now let's look an example of some data: Let's suppose one night you're leak data looks like this

• 
  Median = 1.0 L/min [You can only get this number from the ResScan software.]
  95% = 7.2 L/min [This is the Leak number shown on your S9's LCD]
  Max = 15 L/min [You can only get this number from the ResScan software.]
  

The median leak rate = 1.0 L/min means that for 50% of the time the S9 was on, your leak rate was LESS THAN or EQUAL TO 1.0 L/min. And so for 50% of the night, your leak rate was also GREATER THAN or EQUAL TO 1.0 L/min. So in the 7.5 hours you slept with the machine, for 3.25 hours (3 hours and 15 minutes) you had a leak rate of LESS THAN or EQUAL TO 1.0 L/min.

The 95% leak rate = 7.2 L/min means that for 95% of the time the S9 was on, your leak rate was LESS THAN or EQUAL TO 7.2 L/min. And so for 5% of the night, your leak rate was GREATER THAN or EQUAL TO 7.2 L/min. Now it's important to realize that 5% of one hour is equal to three minutes. Since you slept for 7.5 hours, that means your leak rate was GREATER THAN or EQUAL TO 7.2 L/min for a grand total of (3 minutes)*(7.5 hours)=22.5 minutes. That 22.5 minutes of "high leak rates" might be in one giant half hour leak or it could be in several smaller leaks---the only way to know is that to look at the detailed graphs in ResScan. [You find the detailed graphs under the "Detailed Graphs" tab. If you only download "summary data" the detailed graphs won't be there.]

The max leak rate=15L/min indicates that at some point when the S9 was sampling leak data, it detected a leak that was as large as 15L/min. It may have been a very short lived thing---when you broke the seal to scratch your nose for example. Or it could be that on one or two of the big leaks that you had, the leak pretty quickly went from in the neighborhood of 2.5 L/min to 15 L/min and stayed there. But you know for sure that you could not have leaked at a rate of 15L/min for more than about 22 minutes because of the 95% leak rate number and the time the machine was on.

Interpreting the leak rate data is also important:

First, on the Short Sleep Quality menu, if you see a Red Frowny face, that indicates your 75% leak rate is AT or ABOVE 24 L/min and Resmed's litertature indicates that you are leaking AT or ABOVE a rate of 24 L/min for 25% of the night. And at that point, the ResMed engineers believe that your therapy can and probably is being compromised. Your posted leak number is significantly below this rate, hence the S9 does not believe your leaks are sufficiently large to compromise your therapy.

Many people take the 95% Leak Rate to be the key stat Leak data. But it is worth looking at the median leak rate as well, in my opinion. The reason I look at both is that the median leak rate tells me whether I was leaking off and one all night long or not, where the 95% leak rate tells me if my worst leaks were bad ones or not. To illustrate what I mean, let's look at two examples:

Person A sleeps for 7.5 hours and is leaking off and on all night at a rate of 5.5 L/M and for about 25 minutes during the night, the leak rate actually is between 7 and 10 L/min. So A's leak numbers look like this:

median=5.5, 95%=7.0, and max=10.0

Now suppose Person B sleeps for 7.5 hours and has NO leaks at all for most of the night, but has ONE 25 minute leak where the leak rates are from 8 to 10 L/min during this leak. B's leak numbers look like this:

median=0.0, 95%=8.0, and max=10.0

Neither person's leak rates are grate enough to trigger the Red Frowny face in the short Sleep Quality menu on the LCD. But Person A is likely to be having more significant problems with comfort due to leaking all night long.

Obviously, the closer to 0 your leak rate data is, the better obviously. But the information from Resmed seems to indicate that leaks above 24 L/min (the RED LINE in ResScan's detailed graphs) are enough to cause problems with the algorithms the S9 uses in order to detect and respond to apneas, hypopneas, flow limitations, and snores. So in any case you really want your 95% leak rate under 24 L/min to insure that you're getting some kind of meaningful therapy. But comfort is as a much of an issue as therapy is in my opinion: Nasty leaks cause most people real discomfort and they frequently cause people to wake up multiple times during the night to fiddle with the mask even when the leak is well below 24 L/min. For me, I don't worry at all if my 95% leak rate is below 10 L/min unless I had to fiddle with my mask more than once in the night. And if I wake up multiple times needing to fiddle with my mask because of leaks, then the leak rate IS a problem regardless of how low the 95% leak rate is.

Now, I don't know if you are using an S9 Elite (CPAP only---fixed pressure) or an S9 AutoSet (but running in CPAP mode). It would help to select Text in the equipment description so that it's clear when you're asking for help. If you're using an S9 Elite or an S9 AutoSet running in CPAP mode, the pressure data in ResScan will be boring: The median, 95% pressure, and max pressure (in ResScan) will all read 10cm since the pressure was constant. If you ever run in Auto mode, however, the meanings of median, 95%, and max pressure are similar to those of median, 95%, and max leak.

But if you are using an S9 AutoSet running in Auto mode, then the Pressure setting in the detailed Sleep Quality menu on the LCD is the 95% precentile pressure level---i.e. your pressure was AT or BELOW this pressure for 95% of the time the S9 was running during the night and your pressure was AT or ABOVE this pressure for 5% of the time the S9 was running during the night. If you go into ResScan, you will see a median and maximum pressure level for the night as well. The statistical definitions of these terms are similar to the definitions of the median and maximum leak rates. I will leave it to others to interpret the significance of these pressure levels in terms of your therapy.

I hope that helps

[avi123]

robysue, thanks for the primer. About those leaks, does the S9 separate between leaks that occur during inhalations and those that occur during exhalations? Those that occur during inhalations are the important ones. Exhaling could cause the mask to leak even more by pushing it off the face and thus could affect the calculations and make them useless, no?

[robysue]

robysue, thanks for the primer. About those leaks, does the S9 separate between leaks that occur during inhalations and those that occur during exhalations? Those that occur during inhalations are the important ones. Exhaling could cause the mask to leak even more by pushing it off the face and thus could affect the calculations and make them useless, no?

Nope, the S9 samples the air flow several times a minute and after calculating the actual flow into/out of the lungs and the expected intentional exhaust flow out of the mask (which is a constant flow out of the exhaust flow based on pressure), the leak is any thing that is in addition to whatever you're currently exhaling and the mask is intentionally leaking.

If the mask is fit properly on your face, your normal exhales should NOT be causing the mask to leak beyond the expected intentional exhaust flow rate built into the mask (plus your exhale rate as well). Your exhale rate is NOT considered to be part of the leak rate---it's part of the airflow data or wave form data that the S9 is analyzing to determine your breathing pattern breath by breath.

If the mask is not fit properly on your face or if you are opening your mouth, then the leaks from the mask or from your mouth---from the flow generated by the machine (and possibly your exhales that are not properly detected by the S9's sensors)--are potentially great enough to compromise your therapy. The ResMed engineers are confident that therapy is not too compromised as long as unintentional leaks are kept to less than 24 L/min for no more than 25% of the time the machine is running over the course of the night. That's the threshold that turns Mr. Green Smiley into Mr. Red Frowny on the short Sleep Quality Menu on the LCD. My guess is that most people will find their comfort (and hence their sleep quality) will be seriously compromised long before Mr. Red Frowny shows up. And if leaks are causing problems with you getting to sleep or staying asleep, they're serious enough to need to be fixed in my humble opinion because they're interfering with your sleep quality even if they're not officially compromising your therapy.

[purirucha]

Hello,
I would like to know if I change my data setting from "1 month" to "1 day" and I need to record information on my SD card for 2 weeks total, will I be able to see the overall data ( the average result from those 14 days), even if I want to set it up at "daily" to see every day my results? or
In order to get the results for the full 2 weeks, do I have to set it back to "1 Month" Setting? I appreciate your help, because I need the recorded data for the 2 full weeks.
I tried to see day 1 today, as I learned how to view it, but on the "1 day " setting, it only showed me the data collected from one day (day 1). When I switch to "1 Week" setting, it shows the data for both of the days accumulated, not each day individually. This is the reason I am asking this important question, because I need to have every day's data recorded in the machine for my doctor/technician to see the results. She set it up at "Monthly", because there is no "2 Weeks" setting.
I appreciate immediate reply, since I need to set up my resmed tonight to the setting that will record and accumulate the data I need in 2 weeks. Thank you so much in advance!

[palerider]

Hello,
I would like to know if I change my data setting from "1 month" to "1 day" and I need to record information on my SD card for 2 weeks total, will I be able to see the overall data ( the average result from those 14 days), even if I want to set it up at "daily" to see every day my results? or
In order to get the results for the full 2 weeks, do I have to set it back to "1 Month" Setting? I appreciate your help, because I need the recorded data for the 2 full weeks.
I tried to see day 1 today, as I learned how to view it, but on the "1 day " setting, it only showed me the data collected from one day (day 1). When I switch to "1 Week" setting, it shows the data for both of the days accumulated, not each day individually. This is the reason I am asking this important question, because I need to have every day's data recorded in the machine for my doctor/technician to see the results. She set it up at "Monthly", because there is no "2 Weeks" setting.
I appreciate immediate reply, since I need to set up my resmed tonight to the setting that will record and accumulate the data I need in 2 weeks. Thank you so much in advance!

the settings you're talking about are for display only they have no effect whatsoever on what is written to the card.

there's no way to see only 2 weeks on the display.

you can pull the data every week into resscan or sleepyhead and then look at that.

[chunkyfrog]

I always used the one day setting.
Anything else would only display averages.
The description "new" threw me---then I saw the date . . .

[LSAT]

The SD card records data by day...When the doctor looks at it he can see every day that you used the machine. If you download the Sleepyhead software you can see the same data the your doctor will see.
https://sleep.tnet.com/resources/sleepyhead