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Resmed S9 variations between machines
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JTofSD Offline

New Members

Posts: 3
Joined: Jun 2016

Machine: Resmed S9 auto
Mask Type: Full face mask
Mask Make & Model: Resmed S9 auto
Humidifier: Hfi
CPAP Pressure: 20 high 4 low
CPAP Software: SleepyHead

Other Comments:

Sex: Male
Location: USA

Post: #1
Resmed S9 variations between machines
Hi everyone,

Recently I had my three year old Resmed S9 in for repairs. While it was getting fixed, I had a rental model. Same style Resmed S9, same exact settings.

I used the rental for over a month. With the rental my pressures each night were running about 8 or so. Prior to that with my original one, the pressures were running about 11-12 on average.

I got the original machine back and have used it for a few nights now. Again the pressures are up to 11-12 on average.

Is there really that much difference between units? I can see no difference in the settings, and they are both the same model. I used my own tubing and mask on each one.

What are your thoughts?

Thanks
07-21-2016 08:03 AM
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chill Online

Advisory Members

Posts: 852
Joined: Mar 2016

Machine: DreamStation X500
Mask Type: Full face mask
Mask Make & Model: Walk-in Mask Closet
Humidifier: DreamStation
CPAP Pressure: 13-16
CPAP Software: SleepyHead

Other Comments: CPAP True Believer

Sex: Male
Location: Vancouver, Canada

Post: #2
RE: Resmed S9 variations between machines
I'd suspect that one of them is mis-calibrated.
07-21-2016 09:23 AM
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JTofSD Offline

New Members

Posts: 3
Joined: Jun 2016

Machine: Resmed S9 auto
Mask Type: Full face mask
Mask Make & Model: Resmed S9 auto
Humidifier: Hfi
CPAP Pressure: 20 high 4 low
CPAP Software: SleepyHead

Other Comments:

Sex: Male
Location: USA

Post: #3
RE: Resmed S9 variations between machines
How do I tell which one?
07-21-2016 03:50 PM
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chill Online

Advisory Members

Posts: 852
Joined: Mar 2016

Machine: DreamStation X500
Mask Type: Full face mask
Mask Make & Model: Walk-in Mask Closet
Humidifier: DreamStation
CPAP Pressure: 13-16
CPAP Software: SleepyHead

Other Comments: CPAP True Believer

Sex: Male
Location: Vancouver, Canada

Post: #4
RE: Resmed S9 variations between machines
You would need a manometer for the appropriate range and the correct fittings. Likely your supplier has these if they do any service work.
07-21-2016 03:54 PM
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vsheline Offline

Advisory Members

Posts: 1,907
Joined: Jul 2012

Machine: S9 VPAP Adapt (USA Model# 36007, not better 36037 or 36067)
Mask Type: Full face mask
Mask Make & Model: F10 or SimPlus w/ 2Liners. MirageQuatro & Gecko gel pad
Humidifier: H5i
CPAP Pressure: 15 EPAP, PS 5-10
CPAP Software: ResScan

Other Comments: Marfan Syndrome, chronic bradycardia, occasional Cheyne-Stokes Respiration

Sex: Male
Location: California, USA

Post: #5
RE: Resmed S9 variations between machines
Hi JT,

It is not good to have the Min Pressure setting more than 1 to 4 lower than your 90% or 95% pressure.

The 95 percentile pressure is the measured/estimated pressure your mask was at or below at least 95% of the time. It is also the pressure the mask was at or above for at least 5% of the time.

ResMed machines use the Min Pressure as a target they are always slowly trying to get back to. If the Min Pressure is too low the machine will be too quick to lower the pressure, making it more likely that obstructive events will happen more frequently.

Membership in the Advisory Member group should not be understood as in any way implying medical expertise or qualification for advising Sleep Apnea patients concerning their treatment. The Advisory Member group provides advice and suggestions to Apnea Board administrators and staff on matters concerning Apnea Board operation and administrative policies - not on matters concerning treatment for Sleep Apnea. I think it is now too late to change the name of the group but I think Voting Member group would perhaps have been a more descriptive name for the group.
(This post was last modified: 07-24-2016 05:17 PM by vsheline.)
07-24-2016 05:11 PM
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Dawei Offline

Preferred Members-2

Posts: 342
Joined: Feb 2012

Machine: ResMed S9 AutoSet
Mask Type: Other
Mask Make & Model: Respironics "FitLife"
Humidifier: H5i
CPAP Pressure: 10-20
CPAP Software: ResScan SleepyHead

Other Comments: Began CPAP in 2006; spent the first 6 years with a "brick"

Sex: Male
Location: Western North Carolina

Post: #6
RE: Resmed S9 variations between machines
JT--As chill has suggested, it may be that one of the two machines is not properly calibrated. You could ask your DME if it is possible for them to test the machine for pressure calibration?

David
07-24-2016 06:32 PM
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