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Leak rate numbers and interpretation
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KSMatthew Offline

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Posts: 179
Joined: Jul 2016

Machine: PR DreamStation Auto
Mask Type: Nasal pillows
Mask Make & Model: ResMed Swift FX
Humidifier: none
CPAP Pressure: 7
CPAP Software: SleepyHead

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Sex: Male
Location: Kansas, United States

Post: #1
Leak rate numbers and interpretation
Sleepyhead statistics show:

Average leak rate
90% leak rate
% of time above Leak Rate threshold

What do they actually represent?

I have approx 60 days of data that show:
Average leak rate = 1.25
90% leak rate = 5.00
% of time above Leak Rate threshold 0.02%

I use nasal pillows and I commonly have small leaks. I know the vent allows a measured leak rate.

My graphs show:
Leak Rate -
Min: 0.00
Med: 0.00
95%: 8.00
Max: 25.00
09-08-2016 07:59 PM
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justMongo Offline

Monitors

Posts: 3,847
Joined: Sep 2013

Machine: ResMed VPAP Auto (S9)
Mask Type: Full face mask
Mask Make & Model: ResMed Mirage Quattro
Humidifier: ResMed H5i
CPAP Pressure: 18 IPAPmax - 11 EPAPmin, PS=5
CPAP Software: Other Software

Other Comments: μολὼν λαβέ

Sex: Male
Location: Калифорния

Post: #2
RE: Leak rate numbers and interpretation
Member robysue is a math instructor.
You need to read her primer on statistics.
http://adventures-in-hosehead-land.blogs...de-to.html

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.
09-08-2016 08:21 PM
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KSMatthew Offline

Advisory Members

Posts: 179
Joined: Jul 2016

Machine: PR DreamStation Auto
Mask Type: Nasal pillows
Mask Make & Model: ResMed Swift FX
Humidifier: none
CPAP Pressure: 7
CPAP Software: SleepyHead

Other Comments:

Sex: Male
Location: Kansas, United States

Post: #3
RE: Leak rate numbers and interpretation
OK, thanks, makes sense. But what's the "Leak Rate Threshold" and is spending 0.02% of my night above it a good or bad thing?

What about the numbers themselves? Is 5 a good or bad number for 90% leak rate? What about 1.25 for the average?
09-08-2016 08:35 PM
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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: #4
RE: Leak rate numbers and interpretation
(09-08-2016 08:35 PM)KSMatthew Wrote:  OK, thanks, makes sense. But what's the "Leak Rate Threshold" and is spending 0.02% of my night above it a good or bad thing?

What about the numbers themselves? Is 5 a good or bad number for 90% leak rate? What about 1.25 for the average?
PR machine report total leak, but I assume these are intentional leak numbers,
If that's the case, then the numbers are pretty good and of no concern. Probably to do with adjusting mask seal or perhaps a bit mouth leak, chinstrap might helps minimize mouth leak. You'll always going to get some intentional leak, not feasible to get zero leak all the time, nothing to worry about as long as leak isn't disrupting sleep

For ResMed machines, 24 L/m is the intentional leak threshold, above that for a brief period is not the end of the world, unless if goes on for long duration, then neither the therapy is effective or the data is accurate
(This post was last modified: 09-09-2016 04:57 PM by zonk.)
09-09-2016 04:45 PM
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