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Leaks worse, AHI better???
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JimZZZ Offline

Advisory Members

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: #1
Leaks worse, AHI better???
Having just switched from a Simplus to an AirFit F10, Sleepyhead says my leaks are much higher but my events, AHI, etc. are quite a bit lower. Could it be that the F10 has a higher intentional leak rate? How do you discover the intentional leak rate for a given mask?

Although higher, my leaks remain well below the 24 level.

BTW, I find the F10 more comfortable than the Simplus because there is no forehead bar and the cushion material seems more thin and flexible on the face.
09-27-2014 05:05 AM
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zonk Offline

Advisory Members

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: #2
RE: Leaks worse, AHI better???
(09-27-2014 05:05 AM)JimZZZ Wrote:  Could it be that the F10 has a higher intentional leak rate? How do you discover the intentional leak rate for a given mask?
Slightly higher but not significant enough. I don,t think matter as the S9 does its calculation assuming you,re using ResMed mask

F&P masks Exhaust-flow information
https://www.fphcare.co.nz/files/documents/osa/exhaust-flow-sheet/

F10 (page 7) http://www.resmed.com/us/dam/documents/p...er_eng.pdf
09-27-2014 05:45 AM
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JimZZZ Offline

Advisory Members

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: #3
RE: Leaks worse, AHI better???
Thanks zonk. You are the greatest at researching questions.

So at my average pressure, the exhaust flow is only 2 l/min higher for the F10 than the Simplus (39 vs. 37) so, as you say, that shouldn't make an appreciable difference. Your second note (S9 calculation assumes a ResMed mask) must be the explanation. At any rate, the therapy is going fine and my question was more from curiosity than anything else. Thanks again!
09-27-2014 05:55 AM
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