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Same AHI at low and high pressures
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abagail_32 Offline

Members

Posts: 5
Joined: Nov 2014

Machine: Resmed Airsense S10
Mask Type: Full face mask
Mask Make & Model: Resmed AirFit F10 for Her
Humidifier: unsure
CPAP Pressure: 6-16
CPAP Software: SleepyHead

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Sex: Female
Location:

Post: #1
Question Same AHI at low and high pressures
Hi All, so I am a bit confused. I am new to CPAP, I've been using it for about a month now.

My prescription was for 6-16 to then see how that went and possibly narrow down on a single pressure (I'm currently hiring a machine, and it is much cheaper to buy a straight CPAP here, however I'm thinking I might import the machine I am hiring from the US).

I initially had no real problems adjusting to CPAP - I could wear the mask the whole night etc, however a month in, I noticed I was gassy and I was still waking up during the night more than normal. A few nights I also had issues where the pressure had gone up to the maximum and the mask leaked like crazy and I had to stop, adjust and start again.

My AHI had been ~0.4 from the very start of using CPAP - so I thought I'd try a couple of nights of lowering the pressure to see if this would make it more comfortable - expecting it to increase my events.

So I've spent a few nights now with a 4-4 pressure (I found it quite comfortable to breathe at) - and my AHI was basically exactly the same ~0.4 - I still had 3-4 OA towards the end of the night, just like the nights where I had the higher pressure. The funny thing is, this was never when the machine increased the pressure, there was always a lump earlier in the night.

From my sleep study they would have prescribed a straight pressure of 10 apparently - I had a only 2 OA, but a number of Hypos during the night as they titrated me.

I'm a little confused by the whole thing really - is it normal to have the same AHI at low and higher pressures? Huh
11-20-2014 07:39 AM
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retired_guy Offline

Preferred Members-2

Posts: 2,744
Joined: Jan 2014

Machine: ResMed S9 Autoset
Mask Type: Nasal pillows
Mask Make & Model: Resmed Airfit P10
Humidifier: ResMed
CPAP Pressure: 10.6/14, EPR 3
CPAP Software: ResScan SleepyHead

Other Comments: Is it bedtime yet?

Sex: Male
Location: Beautiful, albeit very wet Oregon Coast

Post: #2
RE: Same AHI at low and high pressures
My son's experience is similar to yours. In his case, just a little pressure seems to resolve his events. That's nice, but confusing to an old guy like me. What to do, what to do?

I think in your case and his case it comes down to what is comfortable. For me a pressure of 4 and I'm going into panic attacks because I don't think I'm getting enough air. For him, 4's not bad. We sort of compromised and set him up at 6. He's very comfortable with that, his ahi is very very low, he's able to keep a good seal on his mask (he's using a ffm also) and his father thinks he's getting enough air.

So go to where you are most comfortable. If not sure, ask your pop.
11-20-2014 12:23 PM
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trish6hundred Offline

Advisory Members

Posts: 6,453
Joined: May 2012

Machine: Resmed S9 AutoSet for Her
Mask Type: Full face mask
Mask Make & Model: Fisher & Paykel Simplus
Humidifier: H5i Heated Humidifier
CPAP Pressure: 10 - 7-20 Cm H2O
CPAP Software: Not using software

Other Comments: I started CPAP in 2008. Totally blind since birth.

Sex: Female
Location: Missouri, USA

Post: #3
RE: Same AHI at low and high pressures
Hi abagail_32,
WELCOME! to the forum.!
Hang in there for more answers to your questions and much success as you get into the groove of your CPAP therapy.

trish6hundred
11-20-2014 03:24 PM
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