Altitude: Resmed vs Phillips

I live at 7000 ft altitude in Colorado. My original sleep test AHI was 9. I just got a Resmed AirSense 11 after using a Phillips Dreamstation for 5 years. I use fixed pressure because EPR and variable pressure usually results in high AHI. WIth pressure fixed at 11, with dreamstation I had AHI ranging from 1-1.8. WIth the Resmed set at 11 fixed, no EPR, lowest humidity setting, I am getting AHI from 6 to 12. Wondering if anybody has insight. Both machines auto adjust for altitude. All settings seem identical. I am wondering if maybe the auto altitude adjustments might differ between machines so that the actual pressure I am receiving is actually different between these machines. Insights?

sonno wrote: ↑

Sun Feb 08, 2026 5:17 pm

Wondering if anybody has insight

1. Get a free account at SleepHQ.com
2. Upload your data
3. Post the link to your analysis in this thread.

These are three easy steps that potentially yield good advice.

Useful advice. Thanks Granny. Curious if others have seen different results from Resmed vs Phillips at the same pressure settings particularly when altitude is a factor.

Second the advise to get a SleepHQ.com account to really see what is going on under the hood of your machine (so much not displayed on your machine. You get more functionality if you upgrade above the free account to a $175/yr. paid account. I think worth it... There are youtube videos from Sleep HQ to see what they offer... it's an Australian company with some sharp people...

You will also need an SD Card inserted into your machine that you upload this detailed data to the Sleep HQ cloud. This can be uploaded on a windows computer or apple products (iphone, ipad)... Sleep HQ also has a medical grade pulse oximeter that I use to monitor O2 levels during sleep. The O2 oximeter firmware is specific to Sleep HQ and it connects via a bluetooth connection with iphone or ipad. I live in Colorado also and have CSA's at altitude since retiring here. My original Resmed 11 Airsense CPAP/APAP didn't help for my CSA's... so two failed sleep studies later I am now approved for a BIPAP with "ASV" function... this has virtually eliminated my CSA's and hypopneas. Seems like you start out with a "Ford" and then eventually medical insurance approves you for the Cadilac of machines.

That is my journey...

MT