advice on setting up an auto-bipap

[bob simons]

I may be doing something wrong, but I set the numbers as suggested:

Min EPAP = 10 = your old min pressure setting
Max IPAP = 17 = your fixed IPAP pressure
Max PS = 4 = the difference between your fixed IPAP and EPAP settings.
Min PS = 2 = a wild guess on my part

and got these results according to Sleepyhead
EPAP min 10 and max 15, with med of 10 and 95% of 14.80
IPAP min 12 and max 17 with med of 12.5 and 95% of 16.8
PS min 2 and max 4 and med of 2 and 95% of 4

Is this in fact correct as you'd expect? AHI is down to 1.69 but this is one night's results.

thanks again for all your help.
Channel Min Med 95% Max
EPAPExpiratory Pressure (cmH20)
W-Avg: 10.91 10.00 10.00 14.80 15.00
IPAPInspiratory Pressure (cmH20)
W-Avg: 13.38 12.00 12.50 16.80 17.00
PSPressure Support (cmH20)
W-Avg: 2.47 2.00 2.00 4.00 4.00
Minute Vent.Minute Ventilation (L/min)
W-Avg: 7.43 0.12 7.25 10.25 20.25
Resp. RateRespiratory Rate (breaths/min)
W-Avg: 12.55 7.79 12.40 14.60 17.40
LeaksLeak Rate (L/min)
W-Avg: 4.61 0.00 0.00 17.00 53.00
Total LeaksTotal Leak Rate (L/min)
W-Avg: 36.27 27.00 34.00 50.00 89.00

[robysue]

I may be doing something wrong, but I set the numbers as suggested:

Min EPAP = 10 = your old min pressure setting
Max IPAP = 17 = your fixed IPAP pressure
Max PS = 4 = the difference between your fixed IPAP and EPAP settings.
Min PS = 2 = a wild guess on my part

and got these results according to Sleepyhead
EPAP min 10 and max 15, with med of 10 and 95% of 14.80
IPAP min 12 and max 17 with med of 12.5 and 95% of 16.8
PS min 2 and max 4 and med of 2 and 95% of 4

Is this in fact correct as you'd expect?

Those numbers make perfect sense given the settings and the fact that you had been titrated at 17/13.

If allowing the EPAP to go to almost 15 is causing problems with air in your stomach, you could bump the min PS = 3. Chances are that won't increase the AHI

AHI is down to 1.69 but this is one night's results.

That's good news. Let's hope the AHI stays low.

[Aardvark08]

Question.  I have a 750P Respironics. I get my best AHI with fixed PS, and worst with variable.  I don't know what to change to toggle?  Please?

[Sleepster]

Question.  I have a 750P Respironics. I get my best AHI with fixed PS, and worst with variable.  I don't know what to change to toggle?  Please?

Hmmm... How were you able to determine that you get a better AHI with a fixed PS if you don't know how to set the machine at a fixed PS?

I don't know, either, but I would guess that you just set the min PS and the max PS at the same value. Perhaps someone will come along and tell us for sure.

[Aardvark08]

Right, that would be logical.  But mine is an early 750P and does not allow the setting of minimum and maximum PS.  Max only, and the lowest setting is 3.  I only see the difference in the Sleepyhead data.  Thanks!

[Sleepster]

I only see the difference in the Sleepyhead data. 

What is it that you see? There's some particular value of the PS that gives you the lowest AHI?

[Aardvark08]

Thanks.  I note that sometimes the Sleepyhead Machine Settings shows variable PS and at other times fixed PS while in auto mode.  While my profile shows a Resmed Airsense 10, I have had such bad luck with it (don't know exactly why) I thought I would go back to my 2009 Repironics 750 bipap  to do a bit of titration.  My best numbers seem to come on that machine with äuto bipap and FIXED PS.  I don't know how you can have a FIXED PS on this machine unless the setting of minimum and maximum EPAP are the same, which of course is not possible on my machine.