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Breathing through a straw
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CFDRich Offline

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Posts: 5
Joined: Aug 2013

Machine: ResMed S9
Mask Type: Nasal pillows
Mask Make & Model: a
Humidifier: a
CPAP Pressure: 11
CPAP Software: Not using software

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Sex: Male
Location:

Post: #1
Breathing through a straw
I have a ResMed s9 and pressure setting of 11. It works great and I love it. I recently bought a ResMed S8 for the firehouse because traveling with my S9 every third night is a pain.

When I use the S8, although the pressure is the same and I had it tested at a local CPAP store, it feels like it's only 2/3 of the S9. I can barely sleep. I tried different tubing and nasal pillow size with no improvement. The tech at the store says my S9 is blowing 150 lpm but he doesn't know what the S8 is blowing.

I don't think I need more pressure but I might need more volume. Any suggestions???
08-12-2013 03:45 PM
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Shastzi Offline

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Posts: 1,174
Joined: Dec 2012

Machine: ResMed S9 Autoset
Mask Type: Full face mask
Mask Make & Model: FitLife Total face mask
Humidifier: F&P HC150 with Hybernite heated hose.
CPAP Pressure: 15cm-20cm H2O (auto)
CPAP Software: SleepyHead Other Software

Other Comments: CMS50-F wearable Oximeter; Software: SPO2 Assistant

Sex: Undisclosed
Location: Florida, USA.

Post: #2
RE: Breathing through a straw
Ok, #1. the tech tested the S8 for same pressure as the S9.

How did he do this? With a separate manometer?

#2. How is he able to tell you the S9 is moving 150LPM but not the S8?

If he can use a manometer and an anemometer the solution should be fairly easy.
Didn't he get any math in high school?

I am as perplexed as you, CDF.

Dont-know

"With ordinary talent and extraordinary perseverance, all things are attainable." - Thomas Foxwell Buxton

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08-12-2013 04:03 PM
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CFDRich Offline

Members

Posts: 5
Joined: Aug 2013

Machine: ResMed S9
Mask Type: Nasal pillows
Mask Make & Model: a
Humidifier: a
CPAP Pressure: 11
CPAP Software: Not using software

Other Comments:

Sex: Male
Location:

Post: #3
RE: Breathing through a straw
The tech used the manometer for both. I had them both with me at the store. He tested the S9 and then removed it and tested the S8. Both registered exactly 11.0. While I was sitting there, I put each machine on and the S9 sounded like a tornado compared to the S8.

He used a chart from the S9 instruction manual to estimate the LPM but didn't have a manual for the S8 so he couldn't tell me.
08-12-2013 04:10 PM
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CFDRich Offline

Members

Posts: 5
Joined: Aug 2013

Machine: ResMed S9
Mask Type: Nasal pillows
Mask Make & Model: a
Humidifier: a
CPAP Pressure: 11
CPAP Software: Not using software

Other Comments:

Sex: Male
Location:

Post: #4
RE: Breathing through a straw
I also tried several different hoses and nothing really changed. The store apparently didn't have an anemometer.
08-12-2013 04:14 PM
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trish6hundred Offline

Advisory Members

Posts: 6,449
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: #5
RE: Breathing through a straw
Hi CFDRich,
WELCOME! to the forum.!
Hang in there for more suggestions and best of luck.

trish6hundred
08-12-2013 06:02 PM
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Paptillian Offline

Preferred Members-2

Posts: 474
Joined: Jun 2013

Machine: S9 AutoSet
Mask Type: Nasal pillows
Mask Make & Model: Swift FX
Humidifier: H5i
CPAP Pressure: 4 - 10, EPR x2
CPAP Software: ResScan SleepyHead

Other Comments:

Sex: Male
Location: Pennsylvania, USA

Post: #6
RE: Breathing through a straw
If I'm not mistaken, the S8 uses the standard CPAP tubing which has a larger diameter than the S9's "SlimLine" tubing. Imagine that you have a cup of water and two straws: a thick one and a thin one. If you blow into each straw to make bubbles in the water, does it feel the same? Probably not. It takes more effort to blow through the thin one and it sounds louder (a moot point for CPAP when the mask is on).

If you're comparing the air coming out of the two open hoses, I would expect them not to sound or feel the same. The important thing is that they both register correctly on the manometer.
(This post was last modified: 08-12-2013 06:56 PM by Paptillian.)
08-12-2013 06:55 PM
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Sleepster Offline
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Posts: 4,995
Joined: Feb 2012

Machine: ResMed AirCurve10 VAuto
Mask Type: Full face mask
Mask Make & Model: F&P Simplus
Humidifier: HumidAir and SlimLine Hose
CPAP Pressure: MaxI 13.6 | MinE 5.2 | PS 4.4
CPAP Software: ResScan SleepyHead

Other Comments: Diagnosed Nov 2011. Conquered aerophagia.

Sex: Male
Location: Houston, Texas

Post: #7
RE: Breathing through a straw
(08-12-2013 03:45 PM)CFDRich Wrote:  I don't think I need more pressure but I might need more volume. Any suggestions???

The thing is, a CPAP machine will deliver whatever volume flow rate (liters per minute) is necessary to maintain the set pressure. You couldn't change the flow rate without changing the pressure, too.

I don't know much about the ResMed machine but I would check that they're both set for the same type of hose.

The tech is measuring the static pressure, that is, the pressure when you're not inhaling. It could be that the machine is not capable of maintaining that pressure when you inhale.

Others have posted on the noisiness of the S9. It seems some are more noisy than others.

Sleepster
Apnea Board Moderator
www.ApneaBoard.com


INFORMATION ON APNEA BOARD FORUMS OR ON APNEABOARD.COM SHOULD NOT BE CONSIDERED AS MEDICAL ADVICE. ALWAYS SEEK THE ADVICE OF A PHYSICIAN BEFORE SEEKING TREATMENT FOR MEDICAL CONDITIONS, INCLUDING SLEEP APNEA. INFORMATION POSTED ON THE APNEA BOARD WEB SITE AND FORUMS ARE PERSONAL OPINION ONLY AND NOT NECESSARILY A STATEMENT OF FACT.
08-12-2013 07:19 PM
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Paptillian Offline

Preferred Members-2

Posts: 474
Joined: Jun 2013

Machine: S9 AutoSet
Mask Type: Nasal pillows
Mask Make & Model: Swift FX
Humidifier: H5i
CPAP Pressure: 4 - 10, EPR x2
CPAP Software: ResScan SleepyHead

Other Comments:

Sex: Male
Location: Pennsylvania, USA

Post: #8
RE: Breathing through a straw
(08-12-2013 07:19 PM)Sleepster Wrote:  The tech is measuring the static pressure, that is, the pressure when you're not inhaling. It could be that the machine is not capable of maintaining that pressure when you inhale.

Sleepster, that makes sense but then why do they only test the machines with manometers if they can pass that test but still fail to maintain IPAP? Seems like a half-done test.
08-12-2013 07:28 PM
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RonWessels Offline

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Posts: 465
Joined: Jun 2013

Machine: REMstar Auto AFlex DS560TS
Mask Type: Nasal mask
Mask Make & Model: ComfortGel Blue
Humidifier: REMstar Heated Tube DS6T
CPAP Pressure: 11 - 20
CPAP Software: SleepyHead

Other Comments: CMS50F Pulse Oximeter

Sex: Male
Location: Ontario, Canada

Post: #9
RE: Breathing through a straw
(08-12-2013 07:28 PM)Paptillian Wrote:  Sleepster, that makes sense but then why do they only test the machines with manometers if they can pass that test but still fail to maintain IPAP? Seems like a half-done test.

Simple. Within the machine. there will be a control loop that periodically takes the measured pressure from a pressure sensor, compares it to the commanded value, and adjusts the airflow appropriately to maintain the commanded pressure.

The question is not whether the machine is capable of providing the airflow. I'm hard-pressed to come up with a realistic failure mode that provides some airflow but not full airflow without obvious things like bearing grinding noises. The question is whether the pressure sensor is calibrated correctly. And that can be determined using just the static test.
08-13-2013 04:22 PM
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Sleepster Offline
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Moderators

Posts: 4,995
Joined: Feb 2012

Machine: ResMed AirCurve10 VAuto
Mask Type: Full face mask
Mask Make & Model: F&P Simplus
Humidifier: HumidAir and SlimLine Hose
CPAP Pressure: MaxI 13.6 | MinE 5.2 | PS 4.4
CPAP Software: ResScan SleepyHead

Other Comments: Diagnosed Nov 2011. Conquered aerophagia.

Sex: Male
Location: Houston, Texas

Post: #10
RE: Breathing through a straw
(08-12-2013 07:28 PM)Paptillian Wrote:  Sleepster, that makes sense but then why do they only test the machines with manometers if they can pass that test but still fail to maintain IPAP?

It's just one simple test. There was a poster here a while back who had a manometer connected while he was breathing so he could monitor the pressure in these situations.

You can get a used PRS1 APAP (Model 550) pretty cheap. It's a newer model than the S8. Check Supplier #2.

Sleepster
Apnea Board Moderator
www.ApneaBoard.com


INFORMATION ON APNEA BOARD FORUMS OR ON APNEABOARD.COM SHOULD NOT BE CONSIDERED AS MEDICAL ADVICE. ALWAYS SEEK THE ADVICE OF A PHYSICIAN BEFORE SEEKING TREATMENT FOR MEDICAL CONDITIONS, INCLUDING SLEEP APNEA. INFORMATION POSTED ON THE APNEA BOARD WEB SITE AND FORUMS ARE PERSONAL OPINION ONLY AND NOT NECESSARILY A STATEMENT OF FACT.
08-13-2013 05:05 PM
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