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Question about Flow Limitations
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retired_guy Offline

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Posts: 2,744
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Machine: ResMed S9 Autoset
Mask Type: Nasal pillows
Mask Make & Model: Resmed Airfit P10
Humidifier: ResMed
CPAP Pressure: 10.6/14, EPR 3
CPAP Software: ResScan SleepyHead

Other Comments: Is it bedtime yet?

Sex: Male
Location: Beautiful, albeit very wet Oregon Coast

Post: #11
RE: Question about Flow Limitations
Surfies right. I thought it would be good to relax the higher pressures a little when you exhale. If you're getting 0.0 that's pretty good I think. The only problem with it is Jedimark's goofy happyface that shows up. (Actually Jedimark, that's a small price to pay for this great product. So don't zap me....)

Now, about that banana split...............
09-13-2014 11:08 PM
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JimZZZ Offline

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Posts: 370
Joined: Dec 2013

Machine: ResMed S9 AutoSet
Mask Type: Full face mask
Mask Make & Model: Fisher & Paykel Simplus
Humidifier: ResMed H5i (not using)
CPAP Pressure: 9 - 14
CPAP Software: ResScan SleepyHead

Other Comments: CareFusion PureSom Ultra Chinstrap

Sex: Male
Location: Western North Carolina

Post: #12
RE: Question about Flow Limitations
At what number does flow limitation indicate a problem? Or what flow limitation range is considered normal?
09-14-2014 07:01 AM
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surferdude2 Offline

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Posts: 1,077
Joined: Jul 2014

Machine: ResMed S9 AutoSet
Mask Type: Full face mask
Mask Make & Model: Mirage Quattro & Optilife
Humidifier: ResMed H5i @ #3 if nose breathing & #5 if mouth breathing
CPAP Pressure: 12 ~ 20 & 11 ~12 if nasal mask
CPAP Software: ResScan SleepyHead

Other Comments: Late stage 2 emphysema

Sex: Male
Location: Mousetown, Southern Illinois

Post: #13
RE: Question about Flow Limitations
Hi Jim, It appears that that flow limitation number is a decimal representing the degree of restriction using 1 as fully restricted (not able to breathe) and 0 as fully breathing through unrestricted airways. With that in mind, the particular number doesn't tell the whole story as to how the restriction is affecting you. It would depend on how much excess capacity you have that could be given up before you felt the effects. That would vary from person to person and depend on what state the person's pulmonary system was in. Some of us don't have much that we can stand to give up before it causes distress. Others are more fortunate.

From what I understand, most people are born with approximately 10 times the lung capacity that they actually need. Obviously a 50% restriction in breathing wouldn't be much of a problem at that time. That's probably a very good thing or else most babies would be in danger of suffocating when the covers get accidentally pulled over their heads for hours at a time.

Some people didn't get the full "10X more than necessary" from the get go. I think I am in that group. Any restriction over .15 has enough effect on me to cause discomfort and sometimes awakens me. Most of those events are handled well by the S9 Auto feature when it raises the pressure but sometimes that just doesn't happen quickly enough. My response is also affected by what stage of sleep I'm in when the event occurs.

I suspect a normally healthy person would score a goose egg in the flow limitation area but since I'm not normal I can't be sure. I've tried to get Mrs. Surferdude to take part in an experiment to compare how she scores in some of these areas but so far she has declined to participate (grossly understating her response).

Sleep-well
(This post was last modified: 09-14-2014 10:38 AM by surferdude2.)
09-14-2014 09:40 AM
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PaytonA Offline
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Posts: 3,019
Joined: Dec 2013

Machine: ResMed S9 VPAP Auto
Mask Type: Full face mask
Mask Make & Model: Resmed Mirage Quattro
Humidifier: H5i(distilled-top up)
CPAP Pressure: VAuto MinE14.0 MaxI 20.6 PS4.0
CPAP Software: ResScan SleepyHead

Other Comments:

Sex: Male
Location: Orange County,California

Post: #14
RE: Question about Flow Limitations
Flow limitations are important as a precursor to OAs. That is how the S9 Autoset uses them. When it sees flow limitations that fall beyond some norm that they have determined, the machine raises the pressure (if it is an auto machine and in auto mode) to prevent OAs.

Actually-I am guessing-The decimal representation for flow limitation refers to what degree of flat the exhale to inhale peak on the flow chart shows. 1.00 would be fully flat and 0.00 would be fully rounded. If you look at the flow limitation chart on Rescan near the Y axis they show representations.

Best Regards,

PaytonA
09-14-2014 12:28 PM
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