[Pressure] Pressure setings

[ginzo]

It is true, I just switched my machine from CPAP to APAP after fighting large leaks that carried over from an older model machine.

I 1st tried a chin strap, (from member suggestions here, and the change from CPAP to APAP was suggested here also) which cut my large leaks in 1/2.

Then when I changed to APAP last Sunday, (pressure 9-14, EPR-3) they went down to ALMOST NIL!!!

Here are last nights readings:


GOOD LUCK!!! Great help here!!!

Hi to Paul in Perth and others

I have attached my sleep report data from my test. No CPAP used in the testing, just a bunch of electrodes attached all over the place. I would like to understand my results if there are any tech heads out there.

I downloaded sleepyhead software with the last 4 days results. Saturday night I was hooked up for 9 hours with a total AHI of 0.55%. Pressure 7.00 - 10.88 (95% at 9.86%) EPAP 4.02% - 7.88% (95% at 6.88%) This seems almost too good to be true? Can APAP really work this well?

[Maverick70]

Looking at your report, the key things are the apneas and hypopneas. Hypopneas are a partial closing of the airway, which you have quite a lot of. The AHI is the total number of apnea and hypopnea events divided by the number of hours asleep. Your AHI was 13, which is moderate. You can also see that the rate of events was much higher during REM sleep.

Something doesn't make sense with your results. The Autoset doesn't report EPAP so something's wrong there. Are you sure it's an Autoset, or is something quoted wrong?

The units for pressure are centimetres of water (cm H2O) and the AHI is events per hour, not a percentage, though normally AHI is quoted as a number without units.

Hope this helps.

Hi Paul

APAP is definately an Autoset, set in "Autoset" mode. Below are Sleepyhead results from last night. After 2.30 hours I woke after finding it difficult to breath, having to take the mask off for a few minutes. The machine seems to have a mind of it's own. Should I increase the min pressure to say 8? Ramp is turned off, but APAP screen still shows min pressure of 6.0 which cannot be adjusted higher.

AHIApnea Hypopnea Index 0.82
ResMed S9
AutoSetModel 36305 - 22101051614
PAP Mode: APAP
Min 7 Max 16 (cmH2O)
Date Sleep Wake Hours
30/08/2015 15:27:44 05:58:57 08:29:53
Large Leak 0.01%
Clear Airway 0.24
Unclassified Apnea 0.00
Obstructive 0.47
Hypopnea 0.12

Event Breakdown

Statistics
Channel Min Med 95% Max
PressureTherapy Pressure (cmH2O)
W-Avg: 7.91 7.00 7.70 9.68 11.08
EPAPExpiratory Pressure (cmH2O)
W-Avg: 4.95 4.02 4.78 6.72 8.08
Minute Vent.Amount of air displaced per minute (L/min)
W-Avg: 5.85 3.00 5.88 7.12 11.88
Resp. RateRate of breaths per minute (Breaths/min)
W-Avg: 13.78 6.60 13.89 17.40 27.40
Flow Limit.Graph showing severity of flow limitations (Severity (0-1))
W-Avg: 0.01 0.00 0.00 0.03 0.38
Leak RateRate of detected mask leakage (L/min)
W-Avg: 0.50 0.00 0.00 2.40 79.20
SnoreGraph displaying snore volume (?)
W-Avg: 0.01 0.00 0.00 0.02 0.32
Insp. TimeTime taken to breathe in (Seconds)
W-Avg: 2.06 0.28 1.88 3.18 13.80
Exp. TimeTime taken to breathe out (Seconds)
W-Avg: 2.42 0.10 2.40 3.36 5.44
Tidal VolumeAmount of air displaced per breath (ml)
W-Avg: 434.24 180.00 420.00 640.00 1200.00

Total time in apnea 00:01:39
Time over leak redline 0.013%
Machine Settings

ModeCPAP Mode APAP
Pressure MinMinimum Therapy Pressure 7 cmH2O
Pressure MaxMaximum Therapy Pressure 16 cmH2O
EPRResMed Exhale Pressure Relief Full Time
EPR LevelExhale Pressure Relief Level 3cmH2O
Session Information.

[ginzo]

That would be a good start in my unprofessional opinion. Your settings are almost identical to mine. Some (more experienced) here go in smaller increments. I think 1 cm won't hurt.

My ramp is 5 minutes, but our EPR (mine and yours) is the same. My start screen is on 5 but ramps to 9 in the 5 minutes.

Looking at your report, the key things are the apneas and hypopneas. Hypopneas are a partial closing of the airway, which you have quite a lot of. The AHI is the total number of apnea and hypopnea events divided by the number of hours asleep. Your AHI was 13, which is moderate. You can also see that the rate of events was much higher during REM sleep.

Something doesn't make sense with your results. The Autoset doesn't report EPAP so something's wrong there. Are you sure it's an Autoset, or is something quoted wrong?

The units for pressure are centimetres of water (cm H2O) and the AHI is events per hour, not a percentage, though normally AHI is quoted as a number without units.

Hope this helps.

Hi Paul

APAP is definately an Autoset, set in "Autoset" mode. Below are Sleepyhead results from last night. After 2.30 hours I woke after finding it difficult to breath, having to take the mask off for a few minutes. The machine seems to have a mind of it's own. Should I increase the min pressure to say 8? Ramp is turned off, but APAP screen still shows min pressure of 6.0 which cannot be adjusted higher.

AHIApnea Hypopnea Index 0.82
ResMed S9
AutoSetModel 36305 - 22101051614
PAP Mode: APAP
Min 7 Max 16 (cmH2O)
Date Sleep Wake Hours
30/08/2015 15:27:44 05:58:57 08:29:53
Large Leak 0.01%
Clear Airway 0.24
Unclassified Apnea 0.00
Obstructive 0.47
Hypopnea 0.12

Event Breakdown

Statistics
Channel Min Med 95% Max
PressureTherapy Pressure (cmH2O)
W-Avg: 7.91 7.00 7.70 9.68 11.08
EPAPExpiratory Pressure (cmH2O)
W-Avg: 4.95 4.02 4.78 6.72 8.08
Minute Vent.Amount of air displaced per minute (L/min)
W-Avg: 5.85 3.00 5.88 7.12 11.88
Resp. RateRate of breaths per minute (Breaths/min)
W-Avg: 13.78 6.60 13.89 17.40 27.40
Flow Limit.Graph showing severity of flow limitations (Severity (0-1))
W-Avg: 0.01 0.00 0.00 0.03 0.38
Leak RateRate of detected mask leakage (L/min)
W-Avg: 0.50 0.00 0.00 2.40 79.20
SnoreGraph displaying snore volume (?)
W-Avg: 0.01 0.00 0.00 0.02 0.32
Insp. TimeTime taken to breathe in (Seconds)
W-Avg: 2.06 0.28 1.88 3.18 13.80
Exp. TimeTime taken to breathe out (Seconds)
W-Avg: 2.42 0.10 2.40 3.36 5.44
Tidal VolumeAmount of air displaced per breath (ml)
W-Avg: 434.24 180.00 420.00 640.00 1200.00

Total time in apnea 00:01:39
Time over leak redline 0.013%
Machine Settings

ModeCPAP Mode APAP
Pressure MinMinimum Therapy Pressure 7 cmH2O
Pressure MaxMaximum Therapy Pressure 16 cmH2O
EPRResMed Exhale Pressure Relief Full Time
EPR LevelExhale Pressure Relief Level 3cmH2O
Session Information.