ResMed data vs Respironics data

On my Respironics M-Series Pro, I averaged about 39 - 40 lpm leak rates (intentional leak was 38 lpm) with an average AHI of 0.5 to 1. The data on my ResMed is a bit funny and was wondering if someone could take a look, let me know how it looks and kinda describe why the difference b/w the two?

7/6
Leak: .4 L/s
AHI: 3.1
AI: 0.0
HI: 3.1

7/7
Leak: 0.02 L/s
AHI: 2.0
AI: 0.5
HI: 1.5

Thanks,

Kevin

PS Can't wait to get home today, my ResMed card reader just arrived from cpap.com today.

Your ResMed machine automatically figures the intentional leak for your mask and subtracts it from the total leak and displays only the additional leak. There is a mask setting in the clinical menu with settings for various ResMed masks and a "Standard" setting for other masks.

jdm2857 wrote:Your ResMed machine automatically figures the intentional leak for your mask and subtracts it from the total leak and displays only the additional leak. There is a mask setting in the clinical menu with settings for various ResMed masks and a "Standard" setting for other masks.

Yeah, I saw that. I think I set it right. Mir Full setting for Mirage Liberty mask.

Check your Mirage Liberty literature that came w/the mask. It will tell you the correct Mask Selection to use. Your Users Manual also probably tells you what Mask Selection to use for the Liberty. The Liberty came out before the S8 IIs if I remember correctly.

Also

Those AHI numbers look durned good, you should be very pleased

DSM

Ok....I FINALLY got the ResMed card reader working on my PC...evidently it doesn't like the wireless card. Anyways. Could some of the ResMed veterans take a look and let me know what I am looking at?

http://www.klockemycomputers.com/cpap/07072009.pdf

1.) I have the machine set to 10.6 cm....why is the median and 95% avg lower than 10.6? According to the graph, it looks like it is never reaching my target pressure.

2.) Why is the pressure dropping to 0 for the last half hour?

3.) I got a handle on understanding the leaks. I have my machine configured for the right mask so that 0.00 l/s is the intentional leak of my Liberty

4.) Never seen AHI in a line graph, any explaination why lines instead of hash marks like on Respironics?

5.) On the events chart, is every blue square a hypopnea? Also, what is the number on the end of the red lines for apneas for? Time in apnea?

Thanks,

Kevin

Is your EPR setting set at 2 on this machine as well? If so that'll probably explain the pressure difference.

Yeah I have my EPR set to 2 on this machine.

klockemy wrote:Ok....I FINALLY got the ResMed card reader working on my PC...evidently it doesn't like the wireless card. Anyways. Could some of the ResMed veterans take a look and let me know what I am looking at?

http://www.klockemycomputers.com/cpap/07072009.pdf

1.) I have the machine set to 10.6 cm....why is the median and 95% avg lower than 10.6? According to the graph, it looks like it is never reaching my target pressure.

2.) Why is the pressure dropping to 0 for the last half hour?

3.) I got a handle on understanding the leaks. I have my machine configured for the right mask so that 0.00 l/s is the intentional leak of my Liberty

4.) Never seen AHI in a line graph, any explaination why lines instead of hash marks like on Respironics?

5.) On the events chart, is every blue square a hypopnea? Also, what is the number on the end of the red lines for apneas for? Time in apnea?

Thanks,

Kevin

1. The machine is delivering set pressure but evidently you spent 95% of your night at a lower pressure. Did you use the mask leak feature (hold your breath when you attach mask to hose, then press/hold 'start' button until the feature comes on for 4 min) to see how it was sealing before you went to sleep?
2. Pressure dropped to zero when you turned off the machine or got up. Is the clock set to the right time? Is that the time you went to bed?
3. Yes.
4. That's just the way ResMed displays it.
5. Yes, hypopneas are little blue squares. You can cut the hypopnea number in half as ResMed overstates them. The number at the top of the red bar is the time length of the apnea.

Looks like you did VERY well - congrats on getting a good night's sleep. More important, how did you feel during the day?

All the best,
LKTNKY

Yeah, I used the mask fit feature and get an excelnt everytime before I go to bed. Everything else you explained, I understand, but I still don't get why my therapy pressure is differing from my set pressure. Is the machine delivering the pressure and then charting what I am actually getting in my 'pipes' considering leaks and breathing?

Also, the time/date is set right on my machine. I just don't get why the pressure graph just drops off like that to zero and stays there for about half an hour. Is that me getting up and the machine still running under the cooldown feature? (BTW, I turn my machine off every morning when I get up, I don't let it auto power down on mask removal)

Thanks! Feeling good. I had to tinker with the H3i since I wasn't aware how they work...first night it was set at "3" and I had nasal rainout, which broke the seal on my Liberty. The night of the report, I had it set for 1.5, no rainout. Now I just need to be more punctual when taking my sleep meds so they aren't still working when I wake up. As far as the settings, I already had most of the hard work done from my previous machine, just trying to iron our idiosyncracies on the ResMed and trying to understand what I was looking at. Personally, I think the ResMed data is more detailed....now I just have to learn to read it.

The AHI graph appears to be a cumulative event by hour display.

It starts each hour at zero and moves up for each event. The height of the graph at the end of the hour represents the AHI for that hour of sleep.

klockemy wrote: ... 1.) I have the machine set to 10.6 cm....why is the median and 95% avg lower than 10.6? ...

Are you using Ramp or EPR?? If using Ramp you have to keep in mind that you are starting out lower than your set pressure and building up to your set pressure over the specified time each time you use the Ramp button. If using EPR you have to keep in mind that EPR is exhalation pressure relief and each time you exhale your pressure drops 1 to 3 cms w/each exhalation AND that we are exhaling approximately half the night and inhaling aprpoximately half the night.

klockemy wrote: ... 2.) Why is the pressure dropping to 0 for the last half hour? ...

I'm taking a guess here but are you using the SmartStart/SmartStop option? Or do you push the button to turn your CPAP off?

klockemy wrote: ... 4.) Never seen AHI in a line graph, any explaination why lines instead of hash marks like on Respironics?
5.) On the events chart, is every blue square a hypopnea? Also, what is the number on the end of the red lines for apneas for? Time in apnea?

Each "step" in the blue line is an hypopnea and it keeps climbing thru the hour w/each hypopnea leveling off at the last hypopnea during the hour and dropping back to 0 at the end of the hour, then starts building a "step" for each hypopnea during the next hour, leveling off at the last hypopnea in the hour and dropping to 0 again at the end of the hour all night long.

The AHI graph should include apeneas along with the hypopneas.

Slinky,

No RAMP and EPR of 2, here. Also, no SmartStart/SmartStop here, I use the On/Off button everytime.

Well, then, using an EPR of 2, roughly half of the night you are exhaling and receiving 2 cms of pressure less than your set pressure at inhalation.