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Liters/minute or liters/second
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PaytonA Offline
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Posts: 3,005
Joined: Dec 2013

Machine: ResMed S9 VPAP Auto
Mask Type: Full face mask
Mask Make & Model: Resmed Mirage Quattro
Humidifier: H5i(distilled-top up)
CPAP Pressure: VAuto MinE14.0 MaxI 20.6 PS4.0
CPAP Software: ResScan SleepyHead

Other Comments:

Sex: Male
Location: Orange County,California

Post: #1
Liters/minute or liters/second
I just read a reply that said that ResMed considers leaks above 24 L/m. My Resmed VPAP reads the leakage rate out as L/s. I have also seen other places where this difference exists including ResMed's website. Am I missing something? If this is all correct, it means that I should be concerned about my readings from the machine if they are above 0.4L/s, which they are constantly. I have been curious about this for some time but did not get around to asking until I noticed it on a post today.

Best Regards,

PaytonA
01-11-2014 12:31 PM
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big_dave Online

Advisory Members

Posts: 409
Joined: Apr 2012

Machine: PR System One DS560
Mask Type: Nasal pillows
Mask Make & Model: F&P Pilairo Q or ResMed Mirage Activa
Humidifier: PR System One
CPAP Pressure: 14 - 20
CPAP Software: SleepyHead

Other Comments: Former ResMed S8 Autoset II user

Sex: Male
Location: Eugene, Oregon

Post: #2
RE: Liters/minute or liters/second
You got it right. My S8 reports L/s like yours does, and it's converted to L/m on the ResScan reports.
01-11-2014 01:03 PM
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justMongo Offline

Monitors

Posts: 3,845
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: #3
RE: Liters/minute or liters/second
Mine reports 0.00 L/sec. If I were to get a leak, it would be at the full-face mask seal; and that would wake me.
I tighten down my mask straps until there is no leakage.

0.4L/s is a lot of air leaking. So where is your setup leaking from?
Your running a rather high pressure at 20/16 cm-H2O.
Might be hard to get a good seal.

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.
01-11-2014 01:35 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: Liters/minute or liters/second
From S8 manual - Indicative Leak Measure

---- Star rating ------------ (L/s) --------------- (L/min)

* * * * * (Excellent) ------- 0.00–0.18 ---------- 0.0–10.8
* * * * _ (Very good) ------ 0.19–0.26 ---------- 10.9–15.6
* * * _ _ (Good) ------------0.27–0.34 ---------- 15.7–20.4
* * _ _ _ (Adjust mask) ----- 0.35–0.41 ---------- 20.5–24.6
* _ _ _ _ (Adjust mask) ----- 0.42–0.49 ---------- 24.7–29.9
_ _ _ _ _ (Adjust mask) ----- ≥ 0.50 -------------- ≥ 30
01-12-2014 12:39 AM
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PaytonA Offline
Wiki Editor
Monitors

Posts: 3,005
Joined: Dec 2013

Machine: ResMed S9 VPAP Auto
Mask Type: Full face mask
Mask Make & Model: Resmed Mirage Quattro
Humidifier: H5i(distilled-top up)
CPAP Pressure: VAuto MinE14.0 MaxI 20.6 PS4.0
CPAP Software: ResScan SleepyHead

Other Comments:

Sex: Male
Location: Orange County,California

Post: #5
RE: Liters/minute or liters/second
Mongo,
I constantly show a leakage of 1.4 -1.7L/m. I am fairly sensitive to leakage and I do not think that is correct. Last night I got a reading of 2.7L/m because the hose came off of my mask and I awoke to the sound of my VPAP pushing a lot of air and I could not find the hose attached to the mask.

Best Regards,

PaytonA
01-12-2014 01:21 AM
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