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Hate to ask stupid questions....
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drgrimes Offline

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Posts: 235
Joined: Sep 2013

Machine: S9 Resmed Autoset
Mask Type: Nasal pillows
Mask Make & Model: Philips Dreamwear
Humidifier: resmed
CPAP Pressure: 5-15
CPAP Software: ResScan

Other Comments:

Sex: Male
Location: Texas

Post: #1
Hate to ask stupid questions....
Flow limitation and minute ventilation-I have tried to research these two types of data, but i do not seem to get an easy definition that tells me whether mine is good or bad. I have been using a Resmed Autoset for about three month with what looks like pretty good results.

My AHI began at around 5 and now is often less than one, sometimes on a bad night maybe 2 or three. All of the data makes good sense except for these two things. The discussions i've read seem to be very technical but i still don't know what a good or bad one looks like or what it means.

Can someone give me a very plain description of what i should look for?
Darrell G
11-16-2013 03:55 PM
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robysue Offline
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Posts: 1,233
Joined: Oct 2013

Machine: PR Dreamstation BiPAP Auto
Mask Type: Nasal pillows
Mask Make & Model: Swift FX
Humidifier: PR Dreamstation humidfier
CPAP Pressure: min EPAP = 4; max IPAP = 9;
CPAP Software: SleepyHead EncoreBasic EncorePro

Other Comments: Papping since September 2010

Sex: Female
Location: Buffalo, NY

Post: #2
RE: Hate to ask stupid questions....
Minute ventilation is just the total volume of air inhaled (or exhaled) in one minute. In other words, you can think of it as the sum of the total amount of air you inhaled in each individual inhalation over the course of one minute. "Normal" minute ventilation (MV) values vary widely based on physical size of the person and also on what the person is doing at the time you measure the MV. For a typical sized adult at rest, the MV is usually between 5 and 8 Liters at rest while awake. During sleep the MV is typically less than it is while resting while awake. From what I've read, MV during sleep is often 10-15% below normal "wakeful resting MV values".

Flow limitation is a change in the shape of the inspiratory part of the wave flow that indicates the upper airway may be slightly compromised or may be starting to collapse. The S9 uses a proprietary algorithm for analyzing the shape of the inspirations in the wave flow and "scores" the inspirations to create the Flow limitation graph. In general, the higher the flow limitation graph, the more "unhappy" the S9's algorithm is with the shape of the inspiration in the wave flow and the more likely the airway is to be compromised. The S9's Auto algorithm will increase the pressure in response to the flow limitation curve going up (and the inspiration part of the wave flow becoming more distorted in shape.)

In general, there are no "normal" values for the Flow limitation curve. In principle, you'd like the flow limitation curve to stay nearly flat and as low as possible. In practice, how much you want to worry about the flow limitation curve strongly depends on how much the flow limitations seem to bother you (their clinical significance is still somewhat controversial), how much additional pressure is needed to smooth out the flow limitation curve, and how much that additional pressure winds up bothering you in terms of the quality of your sleep. For me? It's easier to put up with some raggedness in the flow wave and some (additional) flow limitations being scored by my PR System One than it is to try to put up with the additional pressure needed to eliminate them.
(This post was last modified: 11-16-2013 04:31 PM by robysue.)
11-16-2013 04:26 PM
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drgrimes Offline

Preferred Members-2

Posts: 235
Joined: Sep 2013

Machine: S9 Resmed Autoset
Mask Type: Nasal pillows
Mask Make & Model: Philips Dreamwear
Humidifier: resmed
CPAP Pressure: 5-15
CPAP Software: ResScan

Other Comments:

Sex: Male
Location: Texas

Post: #3
RE: Hate to ask stupid questions....
Robysue thanks for the concise definitions. How do i know if mine is good or bad? My AHI is typically less than one. I will attempt to attach a screen shot in here of my Minute Ventilation. THANKS!!


Hmmm seems that i did not attach an image.....have to learn how....quickly LOL
(This post was last modified: 11-16-2013 04:44 PM by drgrimes.)
11-16-2013 04:42 PM
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Bompa Offline

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Posts: 854
Joined: Mar 2012

Machine: DreamStation Pro
Mask Type: Nasal pillows
Mask Make & Model: Nuance Pro
Humidifier: DreamStation Heated Humidifer
CPAP Pressure: 12.0
CPAP Software: SleepyHead Other Software

Other Comments:

Sex: Male
Location: Falkenburg,

Post: #4
RE: Hate to ask stupid questions....
(11-16-2013 04:42 PM)drgrimes Wrote:  Robysue thanks for the concise definitions. How do i know if mine is good or bad? My AHI is typically less than one. I will attempt to attach a screen shot in here of my Minute Ventilation. THANKS!!


Hmmm seems that i did not attach an image.....have to learn how....quickly LOL

Edit: There are no stupid questions! Just stupid answers.
Anything 5 and under is Good!
Sleep-wellCoffee
(This post was last modified: 11-16-2013 05:24 PM by Bompa.)
11-16-2013 05:21 PM
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PaulaO2 Offline
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Machine: S9 Autoset
Mask Type: Full face mask
Mask Make & Model: F&P Simplus
Humidifier: H5i
CPAP Pressure: 14-20
CPAP Software: SleepyHead

Other Comments: Ehlers-Danlos Syndrome, Hypermobility Type; chronic sarcasm

Sex: Undisclosed
Location: western NC, USA

Post: #5
RE: Hate to ask stupid questions....
(11-16-2013 04:42 PM)drgrimes Wrote:  Robysue thanks for the concise definitions. How do i know if mine is good or bad? My AHI is typically less than one. I will attempt to attach a screen shot in here of my Minute Ventilation. THANKS!!


Hmmm seems that i did not attach an image.....have to learn how....quickly LOL

Here ya go:
http://www.apneaboard.com/forums/Thread-How-to-Attachments

PaulaO2
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11-16-2013 05:33 PM
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trish6hundred Offline

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Posts: 6,446
Joined: May 2012

Machine: Resmed S9 AutoSet for Her
Mask Type: Full face mask
Mask Make & Model: Fisher & Paykel Simplus
Humidifier: H5i Heated Humidifier
CPAP Pressure: 10 - 7-20 Cm H2O
CPAP Software: Not using software

Other Comments: I started CPAP in 2008. Totally blind since birth.

Sex: Female
Location: Missouri, USA

Post: #6
RE: Hate to ask stupid questions....
Hi drgrimes,
WELCOME! to the forum.!
Hang in there for more responses to your post and best of luck with your CPAP therapy.

trish6hundred
11-16-2013 06:35 PM
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zonk Offline

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Posts: 7,908
Joined: Feb 2012

Machine: A10 AutoSet
Mask Type: Nasal mask
Mask Make & Model: Activa LT
Humidifier: Integrated /ClimateLineAir
CPAP Pressure: 9/13
CPAP Software: ResScan

Other Comments: CPAP since Nov 2010

Sex: Male
Location: Australia

Post: #7
RE: Hate to ask stupid questions....
ResScan interpretation guide ... Glossary pages 78-79
http://www.apneaboard.com/ResScan_Interpretation-Guide.pdf

Minute Ventilation
The volume of air breathed in (or out) within any 60-second period
Flow Limitation
A measure of partial upper airway obstruction. This measure is based on the shape of the inspiratory flow–time curve.
A flattening of the inspiratory flow–time curve suggests upper airway obstruction.
A normal inspiratory curve would be round shaped

S9 data management guide http://www.resmed.com/au/assets/document...ow_eng.pdf

Also check "Private Files and Links" forum
basic instructions on interpreting the ResScan Charts and data
11-16-2013 09:53 PM
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drgrimes Offline

Preferred Members-2

Posts: 235
Joined: Sep 2013

Machine: S9 Resmed Autoset
Mask Type: Nasal pillows
Mask Make & Model: Philips Dreamwear
Humidifier: resmed
CPAP Pressure: 5-15
CPAP Software: ResScan

Other Comments:

Sex: Male
Location: Texas

Post: #8
RE: Hate to ask stupid questions....
OK, here are screen shots of my data. Hope i followed the instructions properly. I hope they show properly when it's posted. All i see now is some text indicating the attachments.
[attachment=551]
[attachment=552]
11-16-2013 10:00 PM
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zonk Offline

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Posts: 7,908
Joined: Feb 2012

Machine: A10 AutoSet
Mask Type: Nasal mask
Mask Make & Model: Activa LT
Humidifier: Integrated /ClimateLineAir
CPAP Pressure: 9/13
CPAP Software: ResScan

Other Comments: CPAP since Nov 2010

Sex: Male
Location: Australia

Post: #9
RE: Hate to ask stupid questions....
could you also post pressure graph (maybe leak too) and whats pressure and leaks stats ... median, 95% percentile and maximum
11-16-2013 10:08 PM
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Tez62 Offline

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Posts: 837
Joined: Feb 2013

Machine: Resmed S9 Autoset
Mask Type: Full face mask
Mask Make & Model: Resmed Mirage Quattro
Humidifier: Resmed
CPAP Pressure: 5-15
CPAP Software: SleepyHead

Other Comments:

Sex: Male
Location: Melbourne, Australia

Post: #10
RE: Hate to ask stupid questions....
drgrimes, I mainly check the graphs Zonk has suggested and your AHI graph and pie chart.
11-16-2013 10:11 PM
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