cpap settings

Joanneb · Post by **Joanneb** » Thu Jun 07, 2007 7:30 am

I've been on CPAP for a little over a month. I need help with the readings on my RemStar M Series machine. My 30-day average Apn-Hyp Index is 4.9 and sys leak 35.8 L/min. I use the machine for 7.36 hrs. per night. Before CPAP my AHI was 31/hr. on my side and 58.5/hr. laying on my back. Where can I find help decipering these readings?

bdp522 · Post by **bdp522** » Thu Jun 07, 2007 8:59 am

The AHI, Apnea Hypopnia Index is the total number of apneas plus the total number of Hypopneas divided by the number of hours slept. An AHI of under 5 is considered normal. For the 30 day average, some days were higher than 4.9 and some days were lower. It's the same averaging for the leak, some days are higher, some are lower. You need to check the pamphlet that came with your mask to find out what the acceptable leak rate is for your mask at your pressure.
For the sleep study, add the AHI for side and back. these are already divided by number of hours slept. 31 + 58.5 = 89.5. AHI/RAI** Scale =<5 events /hour = (none); 5-15 events/hour = (mild); 15-30 events/hour = (moderate); >30 events/hour = (severe).

Brenda

Joanneb · Post by **Joanneb** » Thu Jun 07, 2007 9:23 am

I have a Fisher Paykell Opus nasal pillow mask. It didn't come with any pamphlet. I am really interested to know about my leaks.

bdp522 · Post by **bdp522** » Thu Jun 07, 2007 11:27 am

Leaks for the Opus

Pressure 3 5 7 9 11 13 15 17 19 21 23 25

L/m 17 22 26 30 33 36 39 42 45 48 50 52

Brenda

edit; sorry couldn't get the #s to line up better

mhacker · Post by **mhacker** » Thu Jun 07, 2007 11:40 am

For the real number on mask leaks with respironic equipment you need to subtract the "built in" leaks for your mask. Check the documentation for the mask.

For me - The graph in the documentation showed that for my pressure of 11, my mask has a leak rate of 30. I subtract that from the reading of 70 or so and found my leak rate was in the 40+ range. Obviously the lower the leak rate the more efficient it is.

Snoredog · Post by **Snoredog** » Thu Jun 07, 2007 12:03 pm

mhacker wrote:For the real number on mask leaks with respironic equipment you need to subtract the "built in" leaks for your mask. Check the documentation for the mask.

For me - The graph in the documentation showed that for my pressure of 11, my mask has a leak rate of 30. I subtract that from the reading of 70 or so and found my leak rate was in the 40+ range. Obviously the lower the leak rate the more efficient it is.

you have some major leaks if you are getting up in the 70L/m reading. But your pressure could be on the higher end also. You are correct in subtracting your mask flow or intentional leak rate from that value for that machine (the auto version not your Pro), from that subtraction it gives you the actual "external" leak value.

in a perfect world (if there is such a thing), if the mask flow chart shows you "should be" at 38L/m at 11cm pressure then that is what the LCD should be reporting if things are under control. But that is very hard to obtain much less maintain.

Just keep in mind once you get above 75L/m that machine (the auto) starts falling down with any response other than responding to the leak itself, it will start by lowering the pressure by 2cm. It is not so much a problem with like your Pro.

Joanneb · Post by **Joanneb** » Thu Jun 07, 2007 12:47 pm

Thank you Brenda. My pressure is set at 6 & it seems my allowed leak rate is around 25, which means my leak rate is 10.8. I guess that's good.

bdp522 · Post by **bdp522** » Thu Jun 07, 2007 2:18 pm

No, actually that isn't good Joanneb. You want to be as close to that 24 as you can get. It would be ok if your pressure was 13. you need to get some of that leaking under control. You may be mouth leaking. Do you tape your mouth every night? Try it for a night or two and you may see a big difference. You could try a chinstrap but they don't seem to work well for many of us.

Brenda

Joanneb · Post by **Joanneb** » Thu Jun 07, 2007 2:31 pm

I did tape my mouth for 3 weeks but this last week I've been using a chin strap.

bdp522 · Post by **bdp522** » Thu Jun 07, 2007 4:41 pm

The chin strap may not be working for you. You may also need to check the mask to be sure it's not leaking. I know the chinstrap won't work for me.

Brenda

christinequilts · Post by **christinequilts** » Thu Jun 07, 2007 6:35 pm

bdp522 wrote: For the sleep study, add the AHI for side and back. these are already divided by number of hours slept. 31 + 58.5 = 89.5. AHI/RAI** Scale =<5 events /hour = (none); 5-15 events/hour = (mild); 15-30 events/hour = (moderate); >30 events/hour = (severe).

Wouldn't you have to know how long on side & back to determine overall AHI from the numbers listed? I took as an AHI of 31 on side and AHI of 58.5 on back. If see slept 4 hours on her side & 4 hours on her back, her overall AHI would be 44.75. All we know is its somewhere between 31 & 58.5.

bdp522 · Post by **bdp522** » Thu Jun 07, 2007 8:36 pm

Yes, You are right. Thanks for catching the error. Sorry Joanneb, I jumped the gun and didn't think the whole thing through. Without knowing how long the OP slept in each position it isn't possible to get and accurate AHI. However this still leaves you in the severe category.

Brenda

John_M · Post by **John_M** » Thu Jun 07, 2007 9:26 pm

Joanneb wrote:I've been on CPAP for a little over a month. I need help with the readings on my RemStar M Series machine. My 30-day average Apn-Hyp Index is 4.9 and sys leak 35.8 L/min. I use the machine for 7.36 hrs. per night. Before CPAP my AHI was 31/hr. on my side and 58.5/hr. laying on my back. Where can I find help decipering these readings?

The trouble, sigh, Joanneb, is that there is a known bug in the readouts on the M-series machines, I know I got some "good" readouts from their display but I also got some obviously erroneous ones, There is a discussion of this on http://sleepapnea.wikia.com/wiki/M_Seri ... play_Error

I stopped being bothered by this uncertainty when I got Encore Pro operational see http://sleepapnea.wikia.com/wiki/Encore_Pro

For leak rate see http://sleepapnea.wikia.com/wiki/Mask_Leak_Rate

Also you might try reading the FAQ on this forum. cpaptalk-faq.php.

or check out other forums. http://sleepapnea.wikia.com/wiki/Forums
It taken me quite a while to learn about this stuff and I am still learning.

But your numbers do sound good and it looks as though you are on the right track,

John M

Joanneb · Post by **Joanneb** » Fri Jun 08, 2007 8:45 am

Where can you buy the Encore Pro software?

John_M · Post by **John_M** » Fri Jun 08, 2007 10:24 am

Joanneb wrote:Where can you buy the Encore Pro software?

Its getting real hard to find as it is being taken off the market. See the Encore Pro discussions on this board.

You can get a Smartcard Reader cheaply from Taiwan see http://sleepapnea.wikia.com/wiki/Smartc ... ard_Reader

If worst comes to worst and you can't find the software you can always send your card to me or others on this board for free readouts.

John M

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