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SH: Total Leak less than Leak Rate!
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AshSF Online

Advisory Members

Posts: 356
Joined: Oct 2014

Machine: PRS1 D560TS
Mask Type: Nasal pillows
Mask Make & Model: ResMed P10, Bkup: Airfit F10 & Quattro Air
Humidifier: PRS1 60 series with Heated Tube
CPAP Pressure: 8 - 8 w/ Aflex 3
CPAP Software: SleepyHead

Other Comments: Using APAP mode with fixed pressure

Sex: Male
Location:

Post: #1
SH: Total Leak less than Leak Rate!
I saw an anomaly in my SH graphs today.

My PRS1 60 series auto says 0% Large Leak in its LCD readout.
SH said I had significant mask leakage for ~12% of the night.

I have attached the graph here. I see that Total Leak and Leak Rate lines are intersecting i.e. Leak Rate is more than Total Leaks. What gives?


[attachment=1196]

Started APAP 4-20, Closed range to 7.5-14, then straight 8.0 w/ Aflex 3
RDI always below 1. But sleep much much better at straight pressure.
Started on F10, Tried Quattro Air successfully. Finally settled on P10.
01-18-2015 05:22 PM
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Crimson Nape Offline

Monitors

Posts: 1,327
Joined: Oct 2014

Machine: ResMed S9 Autoset
Mask Type: Other
Mask Make & Model: P-10 / F&P Simplus / DreamWear
Humidifier: H5i w/Climateline
CPAP Pressure: 8 - EPR 3
CPAP Software: SleepyHead

Other Comments: CMS-50F & 50IW

Sex: Male
Location: Georgia

Post: #2
RE: SH: Total Leak less than Leak Rate!
It looks like at 7AM your machine had a silicone fart and lost its memory. Did you have any power problems during that period? Also, since I'm a Resmed user, I noticed your pressure graph is different than what I'm use to seeing. Is this display pattern normal for your pressure changes?

Statistics prove that people who have more birthdays live longer.
01-18-2015 05:56 PM
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justMongo Offline

Monitors

Posts: 3,844
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: SH: Total Leak less than Leak Rate!
It's my understanding that:

SH reports total leak... including the intentional leak trough the mask vents.
ResScan attempts to report only true leaks.
Or maybe I'm thinking of PR versus ResMed machines...)

He shutdown for about 20 minutes; at about 0630 hours.

The PR pressure graph is sure different than a ResMed's. Looks like a very different algorithm at work.

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.
(This post was last modified: 01-18-2015 07:38 PM by justMongo.)
01-18-2015 06:58 PM
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AshSF Online

Advisory Members

Posts: 356
Joined: Oct 2014

Machine: PRS1 D560TS
Mask Type: Nasal pillows
Mask Make & Model: ResMed P10, Bkup: Airfit F10 & Quattro Air
Humidifier: PRS1 60 series with Heated Tube
CPAP Pressure: 8 - 8 w/ Aflex 3
CPAP Software: SleepyHead

Other Comments: Using APAP mode with fixed pressure

Sex: Male
Location:

Post: #4
RE: SH: Total Leak less than Leak Rate!
(01-18-2015 06:58 PM)justMongo Wrote:  It's my understanding that:

SH reports total leak... including the intentional leak trough the mask vents.
ResScan attempts to report only true leaks.
Or maybe I'm thinking of PR versus ResMed machines...)

He shutdown for about 20 minutes; at about 0630 hours.

The PR pressure graph is sure different than a ResMed's. Looks like a very different algorithm at work.

I did stop the machine for about 10 minutes at around 0630hrs but it was still hooked on to power. And there was no power interruption.

On SH, you can show both "Total Leaks (Intentional + Unintentional)" and "Leak Rate (Unintentional)". I have shown both on the "Leak Rate" graph I attached.

The PR pressure graph is the result of their "hunt and peck" algorithm which is different from the resmed's "rapid escalation and progressive decay wave" algorithm. As long as I sleep on my side, it keeps jumping from 7 to 8.x and back all night.

Started APAP 4-20, Closed range to 7.5-14, then straight 8.0 w/ Aflex 3
RDI always below 1. But sleep much much better at straight pressure.
Started on F10, Tried Quattro Air successfully. Finally settled on P10.
01-18-2015 11:45 PM
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